OBD2 Codes: Diagnostic Trouble Codes List

P1544 ERS OFF Switch Circuit Malfunction

P1544 Toyota Code

The P1544 diagnostic trouble code (DTC) refers to a potential malfunction in the ERS (Electronic Range Select) off switch circuit. This code indicates that there is an issue with the circuit responsible for controlling the ERS off switch in the vehicle. The ERS system allows drivers to manually select and control the gear range in vehicles equipped with automatic transmissions. When the circuit malfunctions, it can lead to the inability to engage or disengage the ERS off mode. This may result in a loss of control over the gear selection and affect the vehicle’s performance. To address the P1544 DTC, it is recommended to have the vehicle inspected by a professional technician who can diagnose the specific cause of the circuit malfunction and repair or replace any faulty components to restore proper functionality of the ERS off switch circuit.

P1602 Toyota Battery Voltage Drop Malfunction When Start

P1602 battery voltage drop malfunction when start diagnostic trouble code

P1602 Toyota Code

The P1602 diagnostic trouble code (DTC) related to a battery voltage drop malfunction during startup indicates a potential issue with the vehicle’s electrical system. When this code is triggered, it suggests that there is a drop in voltage or insufficient power supply to the engine control module (ECM) during the starting process. The ECM relies on a stable and sufficient power source to properly manage various engine functions. If there is a voltage drop during startup, it can lead to erratic engine performance, difficulty in starting the vehicle, or even engine stalling. To address the P1602 DTC, it is recommended to have the vehicle inspected by a qualified technician who can assess the battery, alternator, and wiring connections to identify and rectify any faults in the electrical system. They will ensure that the vehicle receives the required voltage during startup to prevent any malfunctions and ensure proper engine operation.

P203F Reductant Level Too Low

P203F Toyota Code

This is significant because, in the majority of cases, reductant level sensors are found on diesel-powered vehicles that have a DEF (Diesel Exhaust Fluid) storage tank. One of the main objectives of the ECM, as previously indicated, is to reduce overall vehicle emissions. DEF, a urea solution, is used in diesel engines to help with exhaust burning. The ECM receives information about the level of DEF fluid in its storage tank via the reductant level sensor.

P203F Reductant Level Too Low

P2238 Trouble Code: O2 Sensor Positive Current Control Circuit Low

p2238 code toyota

P2238 code

The engine control module (ECM) detects the O2 sensor for bank 1 with OBD-II generic code P2238. For the heating control circuit of the O2 sensor, sensor number one has a short circuit. Indicating a shorted O2 sensor heater circuit, which results in low circuit voltage control. As a result, the ECM will place the engine into failure mode or open loop fuel control, preventing the fuel feedback control from functioning. Additionally, this will result in the car failing the emissions test.

P058A01 Auxiliary Battery Monitor Module General Electric Failure

P058A01 Toyota 

The voltage, current, and temperature of the battery are all detected by the battery status sensor assembly. The voltage and current are used to compute the charging condition, which is then sent to the ECM. Based on that signal, the ECM sends an order to the generator assembly to create voltage. The battery temperature is also estimated and sent to the ECM from the change in the resistance value of the thermistor incorporated into the battery status sensor assembly. When the battery is heated, the ECM limits the charging current and safeguards the battery based on this signal.

P058A01 Auxiliary Battery Monitor Module General Electric Failure

P1251 Toyota Hilux Turbocharger Electric Stepper Motor Failure

DTC P1251 Stepper Motor Toyota Hilux Vigo

P1251 Toyota Hilux 

P1251 is the most prevalent code for Hilux stepper problems. The codes are only a warning that you may have a problem with the Hilux turbocharger electric motor. This code, in the lack of further evidence, implies that the stepper motor has been changed. It’s also unusual for both the turbo and stepper motors to fail at the same time. Low boost with no evident physical signs is most likely due to a stepper motor malfunction. Any trouble codes that the ECU may have thrown should be investigated.

P0AA6 - Hybrid/EV Battery Voltage System Isolation Lost

P0AA6 DTC 

A high voltage isolation metre is included in the car. The high voltage isolation circuit’s function is to measure the resistance between the high voltage positive and negative direct current (DC) bus and chassis ground. When the ignition switches from ON to OFF and the high voltage contactor relays open, the battery energy control module performs this test. An internal isolation sensor in the battery energy control module detects the resistance between the high voltage DC positive and negative bus and chassis ground. This sensor circuit is subjected to an internal self-check by the battery energy control module. A low amplitude or compressed return signal indicates a lack of chassis ground resistance, and the hybrid powertrain control module 2 will indicate a loss of isolation.

P0AA6 DTC Honda and Toyota

P1737 Shift Motor Short to Ground

p1737 shift motor short to ground

DTC P1737

Shift Motor Short To Ground is the generic description for the P1737 OBD2 code. TCCU sets DTC P1737 if TCCU detects Shift Motor control circuit is open or short to ground.

The TCCU receives feedback from the shift motor through the position encoder. Four encoder switch signals offer information on the rotational direction and position of the shift motor. The TCCU supplies 5 volts to the MPS (Motor Position Sensor). The shift motor functions when the mode switch is changed, and the MPS contact point generates an ON/OFF signal. The TCCU checks the operation of the shift motor when it receives 5 volts.

P0A3F Motor Rotor Position Sensor Circuit

DTC P0A3F

Based on the inputs from the resolver-type position sensor, the motor control module monitors the angular position, speed, and direction of the drive motor generator rotor. A driving coil, two driven coils, and an irregularly shaped metallic rotor make up the position sensor. The drive motor generator’s shaft is mechanically linked to the metallic rotor.

1.There can be inoperative drive motor generator.
2.There can be opened or shorted drive motor generator harness.
3.Drive motor generator circuit inferior electrical connection.

P0A3F Motor Rotor Position Sensor

P0139 HO2S S2 Slow Response

P0139

DTC P0139

This is a common Onboard Diagnostic-II code P0139 that indicates a voltage drop below in the O2 Sensor 2 Bank 1 circuit. During the deceleration cutoff point, the voltage should be at least 02 volts for at least seven seconds.
Essentially, the ECM (Engine Control Module) in your car is determining that the sensor’s reaction is too sluggish. This will start to set off the fault code, and the dreaded “check engine” light will appear on your dashboard.

Normal causes for the P0139 Code:

1.It’s possible that your vehicle’s fuel injection system has a leak, resulting in additional fuel being left in the exhaust system.
2.Faulty rear O2 sensor wiring. The wiring could simply be loose or worn.
3.Bad catalytic converter.

C1A11 Front Radar Sensor Incorrect Axial Gap

DTC C1A11 Toyota

The driving support ECU assembly transmits pre-collision system control operation signals based on signals from the millimetre wave radar sensor assembly. The millimetre wave radar sensor assembly performs self diagnostic to see if the sensor beam axis has deviated when the vehicle is assessed to be moving in a straight line or on a gentle curve based on inputs from the yaw rate sensor, etc. The driving support ECU assembly detects and saves DTC C1A11 if the millimetre wave radar sensor assembly beam axis has deviated.

DTC Detection Condition

When the engine switch is on (IG), misalignment of the millimeter wave radar sensor assembly is detected for approximately 0.2 seconds.

DTC C1A11 Toyota

B2477 Rear Height Sensor Failure

DTC B2477

Rear suspension stroke sensor circuit malfunction detected.

Cause:

1. Check for loose or poor connection the front suspension stroke sensor
2.Open/Short in the wire(s)
4.Faulty rear suspension stroke sensor

B2476 Front Height Sensor Failure

DTC B2476

Front suspension stroke sensor circuit malfunction detected.

Cause:

1. Check for loose or poor connection the front suspension stroke sensor
2.Open/Short in the wire(s)
4.Faulty front suspension stroke sensor

B2476 Front Height Sensor

P2602 Honda Coolant Pump Control Circuit Low

p2602 honda

Honda P2602 

This general powertrain/engine diagnostic trouble code pertains to all OBDII equipped engines with electric coolant pumps, however it appears more frequently in Ford, Honda, Nissan, and Toyota hybrid vehicles.
The Coolant Pump ‘A’ Control Circuit signal is monitored by the Powertrain Control Module (PCM). When the Coolant Pump ‘A’ Control Circuit signal is out of factory specifications, the PCM sets the OBDII code.
The Coolant Pump A (CP-A) is commonly located in front of the engine, on top of the engine, inside the wheel wells, or against the bulkhead. The Powertrain Control Module sends an electrical signal to the CP-A, which controls it (PCM).

The following are some of the symptoms of a P2602 code:

1.Malfunction Indicator Light On
2.Overheating
3.A/C system not functioning properly


P2583-97 Dust or Dirt On Millimeter Wave Radar

Honda P2583-97

The Front Distance Range Sensor detects light reflected from a vehicle ahead by irradiating laser forward and calculates a distance from the vehicle ahead as well as a relative speed. The Front Distance Range Sensor transmits the presence/absence of the vehicle ahead as well as the distance from the vehicle to the vehicle Cruise Control Unit based on the detected signal. The Cruise Control Unit requests the Engine Control Module (ECM) to set the OBDII code P2583-97 when the vehicle’s Cruise Control Unit loses connection with the Front Distance Range Sensor.

p2583-97 dust or dirt on honda millimeter wave radar

C2318 - Low Voltage Error Power Supply Malfunction

C2318 Wiring Diagram

Toyota C2318

The Auxiliary Battery voltage is applied to terminal +B when the power switch is on (IG). The Transmission Control ECU outputs this Diagnostic Trouble Code (DTC) when the input voltage drops

Toyota C2318 Possible Causes

1. Faulty Auxiliary Battery
2. HEV Fuse
3. IGCT Relay
4. Auxiliary Battery harness is open or shorted
5. Auxiliary Battery circuit poor electrical connection

DTC C2318 Detecting Condition

1. Power switch on (IG)
2. Terminal +B voltage of the transmission control ECU is 9.3 V or less for 1 sec. or more.

Toyota C1201 Engine Control System Malfunction

Toyota C1201

The fail-safe mechanism prevents VSC and TRAC operations if a problem in the engine control system is detected via the Control Area Network (CAN). The fail-safe is deactivated and the Diagnostic Trouble Code (DTC) is saved when the signals from the engine are entered properly.

Toyota C1201 Possible Causes

1. Sequential Multiport Fuel Injection (SFI) System Problems

Possible Symptoms

1. Anti-lock Braking System (ABS) Warning Light
2. Engine Light On (or Service Engine Soon Warning Light)

Toyota C1201

OBD2 Code Toyota C1256 Accumulator Low Pressure

Toyota Prius ABS C1256 Replacement Service in Islamabad

Toyota C1256

The accumulator pressure is detected by the Accumulator Pressure Sensor, which is integrated inside the actuator. In the master cylinder solenoid, the Accumulator Pressure Sensor is linked to the Skid Control ECU. The Accumulator Pressure Sensor is monitored by the Skid Control ECU Module. If the Skid Control ECU detects a drop in accumulator pressure, it sets the OBDII code.

Toyota C1256 Possible Causes

1. Faulty accumulator pressure sensor
2. Accumulator pressure sensor harness is open or shorted
3. Accumulator pressure sensor circuit poor electrical connection
4. Faulty skid control ECU

Possible Symptoms

1. Anti-lock Braking System (ABS) Warning Light
2. Engine Light On (or Service Engine Soon Warning Light)

P20CD - Exhaust Aftertreatment Fuel Injector Control Circuit Low Voltage

The exhaust fuel addition injector assembly is installed on the turbocharger sub-output, assembly’s and the feed pump in the supply pump assembly provides low-pressure fuel to the exhaust fuel addition injector assembly. Engine control module sends a signal to the exhaust fuel addition injector assembly, which adds fuel (ECM). Two distinct controllers are utilised with this injector: Forced regeneration and decrease of particulate matter (PM). ECM powers and grounds the exhaust aftertreatment fuel injector’s high and low control circuits. The ECM issues a OBD2 Code when it identifies a malfunction in either of the exhaust aftertreatment fuel injector circuits (DTC)

P20CD Possible Causes

1. Faulty Engine Control Module (ECM)
2. Faulty Exhaust Aftertreatment Fuel Injector
3. Exhaust Aftertreatment Fuel Injector harness is open or shorted
4. Exhaust Aftertreatment Fuel Injector circuit poor electrical connection

P20CD - Exhaust Aftertreatment Fuel Injector Control Circuit Low Voltage

P261B Engine Coolant Pump 'B' Control Malfunction

P261B

OBD2 code P261B stored in the powertrain control module (PCM) when the coolant pump ‘B’ performance goes out of range. The Powertrain Control Module (PCM) monitors the Coolant Pump ‘B’ Control Circuit signal. PCM collects inputs to decide when and for how long the CP-B should be operated.

P261B Possible Causes

1. Faulty engine coolant pump
2. Fault in coolant pump relay
3. Harness and connector issue in coolant pump
4. Coolant pump circuit and wiring problems
5. PCM programming issue

Toyota Engine Bank 1 and Bank 2 A/F and O2 Identification

This provides information on the proper identification of engine bank 1 and engine bank 2 for correct A/F sensor and oxygen sensor replacement. Contains information that identifies engine bank 1 and engine bank 2 on the following engines: 1AZ-FE, 2AZ-FE, 2AZ-FE (PZEV), 1GR-FE, 2GR-FE, 2JZ-GE, 1MZ-FE, 3MZ-FE, 1UR-FE, 3UR-FE, 2UZ-FE, 5VZ-FE, and 1ZZ-FE.

  • Bank 1 (B1) refers to the bank that includes cylinder No. 1.
  • Bank 2 (B2) refers to the bank opposite bank 1.
  • Sensor 1 (S1) refers to the sensor that is located before the catalytic converters.
  • Sensor 2 (S2) refers to the sensor that is located after the catalytic converters.
Toyota Engine Bank 1 and Bank 2 A/F and O2 Identification

B1503 Exhaust Heat Management Warning Detected

B1503 Toyota

B1503 Diagnostic Trouble Code (DTC) is stored when the Combination Meter Assembly (metre circuit plate) detects a malfunction in the Engine Coolant Temperature Sensor that is linked to the Combination Meter Assembly (metre circuit plate) through a direct connection.

When IG voltage is 9.5 V or more and the following condition is detected:

1.Water temperature sensor operation malfunction
2.Water temperature sensor circuit open or short
3.Engine coolant temperature is 120°C (248°F) or more

b1503 toyota exhaust heat management warning detected

OBD2 Code P0172 Fuel System Too Rich

p0172

P0172 code definition

P0172 is a trouble code that is set when the ECU detects too much gasoline in the engine’s air-fuel mixture.

OBD2 code P0172 indicates that the exhaust gases exiting the combustion chamber contain an excessive amount of gasoline. The mass air flow sensor (MAF), oxygen sensors, and manifold absolute pressure (MAP) all used by the ECU to keep track of the engine’s air-fuel ratio. For V6, V8 and V10 engines, Bank 1 is located at the side of the engine that contains cylinder #1.

P07BE Transmission Park Position Sensor/Switch A/B Circuit Correlation

DTC P07BE Honda

The Powertrain Control Module (PCM) identified a correlation issue between the “A” and “B” transmission park location sensor/switch circuits, resulting in this code. This code triggered by the PCM is determined by the particular circumstance, and the check engine light or the service engine soon light will illuminate.

Transmission park location sensor/switch circuit is used to keep track of the transmission’s state. When the transmission is in the park spot, this circuit sends a signal to the PCM. This circuit is usually a safety mechanism that prevents the starter from activating when the automatic transmission is in gear, depending on the engine.

P07BE Transmission Park Sensor

Replace/Repair These Parts To Fix OBD2 Code P07BE

Transmission Park Position Sensor – Faulty sensor will send wrong information the TCM and the PCM and thus affect the gear shifts and performance. Buy new position sensor now!
Harness Transmission Park Position Sensor/Switch – Damaged harness will affect he engine performance and cause transmission control failure too. Buy new sensor harness today!
Transmission Park Position Sensor Connector – Check if the sensor connector is faulty and replace as required. Buy new sensor connector now!
Powertrain Control Module – P07BE code can also display due to some defects in the PCM. So, it is very important to replace the powertrain control module components to get the correct readings. Buy new components form us now!

P1634 Motor Power Inverter (MPI) Signal Circuit Malfunction

OBD2 Code P1634 Honda Fit

Honda Fit hybrid having DTC P1634 means that the vehicle has problem in hybrid system. The hybrid system is controlled by a range of multiple ECM,s. Most of the time this code corresponds to a faulty IMA module or the DC-DC converter itself. Diagnostics of the system can reveal the exact problem area. This DTC is also set if the 12V auxiliary power battery becomes weak. Sometimes This causes the vehicle to run in a failsafe environment and performance becomes very poor.

P1634 Honda Fit

OBD2 Code C2304 Open Or Short Circuit In U Phase

C2304 toyota

The shift control actuator assy consists of the parking lock motor and the rotation angle sensor. Transmission control ECU receives a P position switch signal from the hybrid vehicle control ECU and activates the parking lock motor by controlling current, causing the parking lock mechanism to switch. The transmission control ECU outputs this DTC when it detects a malfunction in the parking lock motor system.

DTC C2304 Detecting Condition

  • Power switch on (IG). (Battery voltage is 8 V or more)
  • Voltage of transmission control ECU terminal MUA is 6 V or less for 1 sec. or more

Trouble Area

  • Shift control actuator assy
  • Wire harness or connector
  • Transmission control ECU assy
  • Transaxle parking lock control relay

OBD2 Code: P1670 Injection Pump System Malfunction

When the ignition switch was turned ON, or when the ECM determines whether it is an error of RAM in ECM or not, the ECM conducts a single communication. If any one of the following status occurs in the communication, the ECM conducts one more communication. While the ECM is conducting the communication, if (a) is duplicated 20 times continuously, or if (b) is duplicated 20 times continuously, or if (c) is duplicated 2 times continuously, the ECM outputs the OBD2 code P1670.

1. There was a communication error when receiving data.
2. Data sent from the injection pump correction unit does not match to the data received from the ECM.
3. Data received from the pump ROM is not input in the period of 1024 msecond.

Although the determining process is completed without a problem, the ECM conducts the communication again if an undefined code is found while checking an identification code of the receiving data. If the undefined code was duplicated 20 times in a row, the ECM outputs the DTC.

dtc P1670 Wiring Diagram
P1670 Wiring Diagram

SAP P2442 Toyota Landcruiser and Prado

OBD2 dtc SAP P2442

The secondary air intake system is part of a vehicle’s emissions control system and can sometimes trigger OBD2 code P0420. It works to support the function of the catalytic converter. The switching valves allow the air pump to pump air into the exhaust stream when an engine is cold, speeding up the process of warming the catalytic converter to burn unused fuel. We have permanent solution for the catalytic and the air injection pump for vehicles having dual exhaust. Diagnostic trouble codes P2442 and P2440 along with P0420 fix is available.

B2AA0-92 CTBA City Brake Active System

Commonly known as brake orders are issued too often, this error is caused when the collision mitigation system or cross traffic monitoring cameras / radars assess a possible collision. It is very common in Pakistan as we have multiple types of fast approaching vehicles at intersections. The system can reset on its own, if not calibrations maybe required. It is also called cross traffic braking assist at some places

diagnostic trouble codes

OBD2 Code: B12C5 Honda Smart key

Possible failure area is Engine Start / Stop button, however low smart key battery or a bad Key decoder (antenna) can also cause this error. The smart key module is hidden behind the odometer

OBD2 dtc

OBD2 Code: P0420 Toyota Prius

p0420 diagnostic trouble code report

As the P0420 code states, whenever the catalytic choked to a stage that the vehicle performance is greatly compromised this code will set in. The catalytic is cleaned and re-installed. Sometimes this code of P0420 also sets in if the oxygen sensors on the cat-con have stopped functioning. We also provide permanent delete function of this OBD2 code P0420.

P2788 Honda Vezel and Honda Fit

Transmission adaptive learning code, please do not ignore this code as this can lead to permanent failure of your dry clutch or dual clutch transmission. Replenish the fluid with Honda DW1 ATF not CVT. We have recovered many cars poured with wrong oil which may cause permanent damage to an expensive gearbox. Re-calibration is always recommended whenever new oil is poured.

vehicle report dtc

C1391 Prius ABS Fault Abnormal Leak in Accumulator

diagnostic trouble codes

Toyota Prius 2010 vehicles had a factory defect that caused leakage of nitrogen from the pressure system effecting the braking of the vehicle. We upgrade the ABS units with a 2013 model in case the following errors are seen. Please note that ABS unit needs to be calibrated very precisely. We also recommend to replenish the brake fluid on time to keep the ABS unit healthy.

OBD2 Code P0300 P0301 Honda and Toyota Cylinder Misfire

P0300 is OBD2 trouble code for Random/Multiple Cylinder Detected. P0301 shows that Cylinder number 1 experiencing  misfire. A popular error on Honda vehicles that may show up if the coil packs of your car are at an end. Replace the bad coils or the complete set and check with an ohm meter before installation. P0351 is code for no 1 coil circuit malfunction.

p0301 p0300 code

P0A7F HV Battery Capacity Serious Deterioration

This DTC error will come up if the traction battery of your Honda Civic or Insight has completed its life cycle. It is recommended to change the pack ASAP to protect other electronics that may heat up and cause further deterioration of expensive controllers.

diagnostic trouble codes

C1259 HV Control System Regenerative Malfunction

dtc c1259

OBD2 Code C1242 Open Circuit in IG1/IG2

If there is a problem with the master cylinder solenoid (skid control ECU) and its power supply circuit. The skid controls ECU stores the diagnostic trouble codes and brings vehicle operation under the fail-safe condition. If the voltage supplied to terminal IG2 is not within the DTC detection range due to malfunctions in parts such as the battery and generator circuit, this OBD2 codes will be present. In Simple terms always check the standard 12V battery condition and measure the voltages when the car is ON and when OFF to ascertain whether it is getting charged or not and then move on to the ABS unit.

Detecting conditions

P3190 Poor Engine Power

From the HV ECU, the ECM receives data such as power output required for the engine (required output), estimated torque produced by the engine (estimated torque), engine RPM of control target (target RPM), whether the engine is in start mode or not. Then, based on the required output and target RPM, the ECM calculates a target torque that is to be produced by the engine and compares it with the estimated torque. If the estimated torque is very low compared with the target torque, or the engine start mode continues for the specific duration calculated by water temperature, an abnormal condition is detected.

Diagnostic trouble code

OBD2 Code P0A80 Toyota Prius Hybrid Battery

When a OBD2 code P0A80 is read / stored in system, it means that the ECM has detected a malfunction in the hybrid vehicle battery management system (HVBMS). This code indicates that a cell has gone weak in the hybrid battery pack. Hybrid vehicles (which do not require external charging) utilize nickel metal-hydride battery packs. Battery packs are actually blocks of batteries (modules) that are wired together using sections of connectors or cables. The typical HV battery is composed of eight (1.2-volt) cells in series. Twenty-eight modules make up the typical HV battery pack.
The voltages are from 205VDC to 236VDC between the inverter and the power extractors, safety measures must be taken to avoid permanent damage or injury to the persons performing work on HV car.

P0A80 prius

OBD2 Code P0420 Catalyst System Efficiency Below Threshold

OBD2 dtc p0420 catalytic converter

The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the OBD2 code P0420 triggers the Check Engine Light if the readings of the two sensors are similar. Oxygen sensors are also referred to as O2 sensors.

C1406 2010 Toyota Fj Cruiser Description

The speed sensor detects the wheel speed and sends the appropriate signals to the Skid Control ECU. These signals are used for brake control. The speed sensor rotors have rows of alternating N and S magnetic poles and their magnetic fields change when the rotors turn. Each speed sensor detects that magnetic change and sends a pulse signal to the Skid Control ECU.

OBD2 dtc

Ford Ranger Wild Track Adblue Off

OBD2 dtc adblue

Ford Ranger Wild track P204F is a Euro6 Compliant vehicle. It comes equipped with an Adblue SCR system. The system P1575-A1 is famous for causing reliability problems. Some times the car gets into a No-start position and the only option is to repair or replace the necessary components. The engine is a famous Duratorq Turbo Diesel. We deleted the Adblue fluid monitoring system from its computer and permanently resolved the issue.

P2583 CTBA Radar Aiming

P2583 Millimeter Wave Radar is a DTC related to driving support system Radar malfunction, It can also cause malfunction in adaptive cruise as well as early haptic feedback on the RFP pedal. Contact our teams for a complete solution to the CTBA system. We also do cruise limit unlock (110km limit unlock) on Honda Hybrids

 

dtc

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