How severe is this DTC?
In terms of severity, I would say this fault is moderately severe, and I’ll tell you why. The EGR (Exhaust Gas Recirculation) system is not a system required for the engine to operate. That said, it improves emissions and also helps your engine run smoothly under varying conditions, so its operation is fundamental if you want your vehicle to run and perform optimally. Not to mention that, if left long enough, the soot passing through these systems could accumulate and cause future issues/problems. Keep your EGR properly maintained to avoid any headaches.
What are some of the symptoms of the code?
Symptoms of a diagnostic code P2145 may include:
- Decreased engine power
- Irregular engine idle
- Poor acceleration
- Poor fuel economy
- Check Engine Light (CEL) on
- Engine misfire-like symptom
What are some common causes of the code?
Causes of this P2145 code may include:
- Dirty/clogged EGR (Exhaust Gas Recirculation valve)
- Faulty EGR vent solenoid
- Clogged EGR vent
- Vacuum leak
- Bent vacuum line
- Connector issue
- Wiring problem (open, corroded, rubbed, shorted, etc.)
- ECM problem
What are the diagnostic and troubleshooting steps for P2145?
The first step in the troubleshooting process for any malfunction is to check the Technical Service Bulletins (TSBs) for known issues with the specific vehicle.
Advanced diagnostic steps become very vehicle-specific and may require the appropriate advanced equipment and knowledge to operate accurately. We include the basic steps below but refer to a repair guide specific to the year/make/model/drivetrain for steps tailored to your vehicle.
Basic Step #1
The first thing you’ll want to do is let your vehicle’s engine cool down. Most of the time, EGR (Exhaust Gas Recirculation) systems are very hot by nature since they are usually mounted directly on the exhaust system. That said, if you don’t let the engine cool properly, you risk burning yourself. As mentioned, EGR valves are often mounted directly on the exhaust. The vent solenoids, which control the EGR venting, are mounted anywhere in the engine compartment, most often on the firewall. Generally, the vent solenoid is a vacuum-controlled solenoid, so there are potentially many rubber vacuum lines running from it to the EGR system.
Remember how hot it is here? These vacuum lines don’t handle these temperatures well, so be sure to inspect these lines thoroughly while checking the surrounding area. Any burned or broken vacuum line should be replaced or repaired. The lines are inexpensive, so I always recommend replacing all the lines with new ones, especially if you find one that is deteriorated; if one has gone bad, chances are the others aren’t far behind.
Basic Step #2
Make sure to thoroughly check the integrity of the involved harnesses. They run along and around the exhaust, so it would be a good idea to secure any loose wires or harnesses. If you find a burned harness and/or wire, solder the connections and be sure to insulate them properly. Inspect the vent solenoid for cracks and/or water intrusion. Since these sensors are exposed to the elements and are mostly made of plastic, you should be aware of some possible defects. Also, ensure that the connectors establish a proper electrical connection and that the tabs are intact and not broken.
Basic Step #3
If accessible and practical, you can remove the EGR valve to check its condition. These valves are prone to a significant amount of soot buildup. Use carburetor cleaner and a toothbrush to remove soot from all stubborn areas.