P245B Exhaust Gas Recirculation Cooler Bypass Control Circuit Range/Performance
Description and meaning of DTC p245b
This is a generic powertrain diagnostic trouble code (DTC) and applies to many OBD-II vehicles (1996-newer). That may include but is not limited to vehicles from Ford, Dodge, Ram, Jeep, Chevrolet, Volkswagen, Mercedes, etc. Although generic, the exact repair steps may vary depending on year, make, model and powertrain configuration. OBD-II trouble code P245B and related codes P245A, P245C, and P245D are associated with the Exhaust Gas Recirculation (EGR) cooler bypass control circuit. The purpose of the EGR cooler bypass control circuit is to open and close the EGR bypass valve under predetermined conditions to prevent the EGR cooler from being overloaded known as fouling that effects the performance and efficiency of a diesel engine. The Engine Control Module (ECM) monitors the operation of this circuit by receiving voltage references from the EGR temperature switch and other associated components to operate the EGR cooler bypass valve returning the exhaust gases to the intake for combustion in most configurations. The location of the EGR bypass valve, EGR cooler, temperature switch and associated components are vehicle specific and vary tremendously determined by the manufacture. When the ECM detects improper voltage or resistance that is outside the normal expected value range within the exhaust gas recirculation cooler bypass control circuit, code P245B will be set and the check engine light, service engine soon light or both may be illuminated.
p245b diagnostic trouble code symptoms
Symptoms of a P245B trouble code may include:Engine may fail emissions testIgnition ping or knock on accelerationIncreased fuel consumptionPoor engine performanceService engine soon light illuminatedCheck engine light illuminated
DTC p245b - possible causes
Causes for this P245B code may include:Defective EGR cooler bypass valveClogged or damaged EGR coolerTemperature switch malfunctionExcessive carbon buildupFaulty or damaged wiringCorroded, damaged or loose connectorDefective ECM
How to fix OBD-II diagnostic trouble code p245b
The first step in the troubleshooting process for any malfunction is to research the Technical Service Bulletins (TSB's) for the specific vehicle by year, model and power plant. In some circumstances, this can save a lot of 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 examine for obvious physical damage. Based on the specific vehicle, this circuit may incorporate several components including the temperature switch, bypass valve, EGR valve, EGR cooler and the ECM. Perform a thorough visual inspection to check the associated wiring for obvious defects such as scraping, rubbing, bare wires, or burn spots. Next is to check the connectors and connections for security, corrosion and damaged pins. This process must include all wiring connections to all the components including the EGR temperature switch and the ECM. Consult the specific tech data for the vehicle to verify the configuration of the EGR cooler bypass valve control circuit and confirm every component incorporated within the circuit which may include a fuse or a fuse-able link in some applications. Advanced StepsThe advanced steps become very vehicle specific and require the appropriate advanced equipment to perform accurately. These procedures require a digital multi meter and the specific technical references for the vehicle. Voltage ChecksThe reference voltage and the acceptable ranges may vary based on the specific vehicle and the circuit configuration. Specific technical data will include troubleshooting charts and the appropriate sequence to follow assisting you with an accurate diagnosis. If this process identifies the absence of a power source or ground, continuity testing may be required to check the integrity of the wiring, connectors and other components. Continuity tests should always be performed with the power removed from the circuit and the normal readings for wiring and connections should be 0 ohms of resistance. Resistance or no continuity is an indication of faulty wiring that is open, shorted or corroded and must be repaired or replaced.