Technical Description of OBD-II Trouble Code
The circuit controlling the vent for exhaust gas recirculation is experiencing high levels of activity.
What does that mean?
This is a standard diagnostic trouble code (DTC) that applies to OBD-II vehicles. It can be found in various vehicle makes such as Citroen, Peugeot, Sprinter, Pontiac, Mazda, Chevy, GMC, Ford, Dodge, Ram, etc.
While driving, the ECM (Engine control module) constantly monitors and adjusts the EGR (Exhaust gas recirculation) systems in our vehicles. These systems allow the engine to reuse air/fuel mixtures that have gone through the combustion process but have not burned completely and efficiently. By recycling this “semi-burnt” mixture and reintroducing it to the engine, fuel economy is improved and overall vehicle emissions are reduced.
Most EGR valves nowadays are controlled electronically through electrical solenoids, vacuum controlled solenoids, or other methods depending on the make and model of the vehicle. The EGR vent solenoid is responsible for discarding unnecessary exhaust gases. Typically, these gases are vented back into the exhaust system and released into the atmosphere after passing through the catalytic converters, resonators, mufflers, etc. It is important to note that the catalytic converter burns most of the unburnt fuel to prevent an increase in emissions. The term “exhaust gas recirculation vent control circuit” may refer to a specific wire that is causing the fault, so consult your service manual to identify the exact physical circuit involved.
While monitoring and adjusting various sensors, switches, and systems, the ECM (engine control module) activates the P2145 code and/or related codes (P2143 and P2144) to indicate a problem with the exhaust gas recirculation vent control circuit.
P2145 indicates a high voltage condition detected within the EGR exhaust gas recirculation vent control electrical circuit.
What is the severity of this DTC?
In terms of severity, I would classify this fault as moderately severe, and here’s why. The EGR (exhaust gas recirculation) system is not essential for the engine’s operation. However, it does improve emissions and helps the engine run smoothly under different conditions, so its proper functioning is crucial for optimal vehicle performance. Additionally, if left unaddressed for a long time, the accumulation of soot in these systems can lead to future problems. Proper maintenance of the EGR system is necessary to avoid any complications.
What are some of the symptoms of the code?
Symptoms associated with the P2145 diagnostic code may include:
What are some of the common causes of the code?
Possible causes for the P2145 code include:
What are some P2145 diagnostic and troubleshooting steps?
The first step in troubleshooting any malfunction is to consult the Technical Service Bulletins (TSB) for known issues related to your specific vehicle.
Advanced diagnostic steps may vary depending on the vehicle and may require specialized equipment and knowledge for accurate diagnosis. The following are basic steps, but refer to a vehicle-specific repair guide for detailed instructions.
Basic Step #1
Begin by allowing the engine to cool down. EGR (exhaust gas recirculation) systems are typically hot due to their proximity to the exhaust system. Failure to let the engine cool adequately can result in burns. EGR valves are often mounted directly on the exhaust, while vent solenoids, which control the EGR venting, are usually located in the engine bay, often on the firewall. Since the vent solenoid is vacuum-controlled, there may be multiple rubber vacuum lines connecting it to the EGR system. Given the high temperatures in this area, thoroughly inspect these lines and replace or repair any that are burnt or broken. It is recommended to replace all lines if one is deteriorated, as others may be close to failure as well.
Basic Step #2
Thoroughly check the integrity of the involved harnesses. Since they run along and around the exhaust, it is advisable to secure any loose wires or harnesses out of the way. If you find a burnt harness or wire, solder the connections and insulate them properly. Inspect the vent solenoid for cracks or water intrusion. Plastic components like these sensors are susceptible to faults due to exposure to the elements. Ensure that connectors make adequate electrical connections and that the tabs are intact and not broken.
Basic Step #3
If accessible and convenient, remove the EGR valve to inspect its condition. These valves tend to accumulate soot. Use carburetor cleaner and a toothbrush to remove soot from stubborn areas.
