How severe is this DTC?
The severity of this code can vary significantly from moderate to severe depending on the specific symptoms of the malfunction and the service level of the cooler and bypass valve. A faulty EGR valve or control circuit can cause engine knocking and pre-ignition that can damage pistons, valves, and other related internal engine components.
What are some of the symptoms of the code?
Symptoms of a P245B trouble code may include:
- The engine may fail the emissions test
- Engine knock or ping during acceleration
- Increased fuel consumption
- Poor engine performance
- Service engine soon light illuminated
- Check engine light on
What are some common causes of the code?
Causes
of this P245B code may include:
- Faulty EGR cooler bypass valve
- Clogged or damaged EGR cooler
- Temperature switch malfunction
- Excessive carbon buildup
- Faulty or damaged wiring
- Corroded, damaged, or loose connector
- Faulty ECM
What are the troubleshooting steps for P245B?
The first step in the troubleshooting process for any malfunction is to research Technical Service Bulletins (TSBs) for the specific vehicle by year, model, and powertrain. In some circumstances, this can save you considerable time in the long run by pointing you in the right direction.
The second step is to locate all components associated with the EGR cooler bypass circuit and look for any potential physical damage. Based on the specific vehicle, this circuit may integrate several components, including the temperature switch, bypass valve, EGR valve, EGR cooler, and ECM. Perform a thorough visual inspection to check that the associated wiring shows no obvious defects such as scraping, rubbing, bare wires, or burn marks. Then, check the connectors and connections for security, corrosion, and damaged pins. This process must include all wiring connections to all components, including the EGR temperature switch and ECM. Consult vehicle-specific technical data to verify the EGR cooler bypass valve control circuit configuration and confirm each component incorporated into the circuit, which may include a fuse or fusible link in some applications.
Advanced Steps
Advanced steps become very vehicle-specific and require appropriate advanced equipment to perform accurately. These procedures require a digital multimeter and vehicle-specific technical references.
Voltage Checks
Reference voltage and acceptable ranges can vary depending on the specific vehicle and circuit configuration. Specific technical data will include troubleshooting charts and the proper sequence to follow to help you establish an accurate diagnosis.
If this process identifies the absence of a power source or ground, continuity tests may be required to verify the integrity of the wiring, connectors, and other components. Continuity tests should always be performed with the power disconnected from the circuit, and normal readings for wiring and connections should be 0 ohms of resistance. Resistance or lack of continuity is an indication of faulty wiring that is open, shorted, or corroded and must be repaired or replaced.
What are the common repairs for this code?
- Replacement of the EGR cooler
- Replacement of the EGR cooler bypass valve
- Replacement of the temperature switch
- Cleaning corrosion from connectors
- Repairing or replacing faulty wiring
- Cleaning carbon buildup
- Replacement of the ECM
Common Mistake
Replacing the EGR cooler bypass valve when carbon buildup or faulty wiring is causing the ECM to set this code.
I hope the information in this article has been helpful in guiding you in the right direction to correct the issue with the Exhaust Gas Recirculation Cooler Bypass Control Circuit error code. This article is strictly informational, and your vehicle’s specific technical data and service bulletins should always take priority.