Fault code P245A – exhaust gas recirculation cooler bypass control circuit/open

Fault code P245A is called “Exhaust Gas Recirculation Cooler Bypass Control Circuit/Open” but in different programs it may be called differently. This fault designation applies to all vehicles equipped with OBD-II.

Technical description and explained code P245A

This diagnostic trouble code (DTC) is a generic code. Fault P245A is considered a generic code because it applies to all makes and models of vehicles. Although the specific repair steps may vary slightly depending on the model.

Fault code P245A – exhaust gas recirculation cooler bypass control circuit/open

The OBD-II fault code is associated with the Exhaust Gas Recirculation (EGR) cooler bypass control circuit. The purpose of the circuit is to open and close the EGR bypass valve under specified conditions. To prevent overloading of the EGR cooler, known as clogging, which affects the performance and efficiency of the diesel engine.

The Engine Control Module (ECM) controls the operation of this circuit by receiving reference voltages from the EGR temperature switch. And other related components to control the EGR cooler bypass valve. Which returns the exhaust gases to the intake port for re-combustion.

When the ECM detects improper voltage or resistance in the EGR cooler bypass control circuit, code P245A is set. The Engine Check Indicator, Engine Maintenance Indicator, or both may also illuminate.

Symptoms of vehicle malfunctions

The main signal that an error P245A has occurred is the Malfunction Indicator Lamp (MIL) is also known as the CheckEngine Light.

It can also be warning signs such as:

  1. The Check Engine light on the control panel will illuminate (the code will be written to the ECM memory as a fault).
  2. The engine may fail the emissions test.
  3. A knock may be heard during acceleration.
  4. Reduced engine performance.
  5. Increased fuel consumption.

The severity of code P245A can range from moderate to severe, depending on the specific symptoms of the malfunction. As well as the level of performance of the cooler and bypass valve.

A faulty exhaust recirculation valve or control circuit, can cause excessive ignition, as well as early ignition. This can cause damage to pistons, valves, and other related internal engine components.

Factors that can cause this error code

The error code P245A can mean that one or more of the following problems have occurred:

  • Dirty or clogged exhaust gas recirculation system (exhaust gas recirculation valve).
  • Faulty exhaust gas recirculation ventilation control solenoid valve.
  • Faulty temperature relay.
  • The exhaust recirculation system vent is clogged.
  • Excessive soot or carbon buildup on the walls.
  • Short-circuited or broken electrical wiring relating to the exhaust gas recirculation system.
  • Weakened, corroded, or damaged electrical connectors related to the exhaust gas recirculation system.
  • In rare cases, engine control module (ECM) malfunction.

How to fix or reset OBD-2 code P245A

Some suggested steps for troubleshooting and fix the error code P245A:

  1. Connect an OBD-II scanner to the vehicle’s diagnostic connector and read all stored data and error codes.
  2. Clear the error codes from the computer memory and test-drive the vehicle to see if code P245A appears again.
  3. If the error code appears again, visually inspect the electrical wires and connectors related to the exhaust gas recirculation system.
  4. If necessary, repair or replace any shorted, broken, damaged, or corroded components.
  5. If the problem persists, check the exhaust gas recirculation system passages for blockage. Inspect the vacuum lines and check thoroughly for vacuum leaks.
  6. Check the operation of the exhaust gas recirculation valve and the vent control solenoid valve.
  7. Measure the voltage in the system vent control solenoid valve circuit using a digital multimeter.
  8. Compare value to manufacturer’s data sheet, replace faulty valve if necessary.
  9. If problem persists, check and replace engine control module (ECM) if necessary.

Diagnose and repair of problems

The first step in the P245A troubleshooting process is to review the Technical Service Bulletins (TSB). For known problems with a particular vehicle.

The advanced diagnostic steps are very vehicle specific. It may require, special equipment and knowledge to accurately perform the steps.

Allow your vehicle’s engine to cool down. In most cases, exhaust gas recirculation systems are very hot. Since they are usually installed directly on the exhaust system. Therefore, if you don’t let the engine cool down, you can get burned.

Visual damage

Locate all of the components associated with the exhaust gas recirculation cooler bypass circuit and examine them for obvious physical damage. Depending on the specific vehicle, this circuit may include several components. Temperature switch, bypass valve, exhaust gas recirculation valve, exhaust gas recirculation cooler and engine control unit.

Perform a thorough visual inspection to check the wiring for obvious defects such as scratches, scuffs, exposed wires or burn spots. Next, check connectors and connections for safety, corrosion, and contact damage.

Be sure to carefully check the integrity of the wire harnesses. They often run along and around the exhaust pipe. Therefore, you need to secure any loose wires. If you find a burned wire, solder it and make sure it is properly insulated.

Voltage check

When checking the voltage, you need to identify the absence of a power source or ground. This requires checking the continuity of the wiring, connectors, and other components.

Normal resistance readings for wiring and connections should be 0 ohms. The presence of resistance or lack of continuity indicates faulty wiring. Which is open, shorted, or corroded and must be repaired or replaced to correct P245A fault.

Reference voltages and allowable ranges may vary depending on the specific vehicle and circuit configuration.

On which vehicles does this problem occur most frequently

Fault code P245A can occur on different vehicles but there are statistics on which brands this occurs most often. Here is a list of some of them:

  • BMW
  • Chevrolet
  • Dodge (RAM)
  • Ford
  • GMC
  • Hyundai
  • Jeep
  • Land Rover (Freelander, Range Rover)
  • Mercedes-Benz (W639)
  • Nissan
  • Opel
  • Ssangyong (Rexton)
  • Volkswagen
  • Volvo

Fault code P245A can sometimes be found with other errors. The most common are the following: P0103, P0113, P0671, P245B, P245C, P245D.


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