P2145 indicates that the voltage supplied to the EGR vent control circuit is higher than expected, meaning the PCM detects an open or short condition in the EGR vent control valve or its wiring. The code is set when the measured voltage exceeds the normal operating range.
The valve may be stuck open, stuck closed, or internally shorted, causing abnormal voltage readings that trigger the high‑voltage detection.
Broken strands, exposed wires, or poor connections to the valve can create a high voltage condition on the control circuit.
A short from the control wire to a 12 V source can raise the measured voltage above specifications, leading to a P2145.
A poor ground connection for the valve’s circuit can cause voltage irregularities that the PCM interprets as excessive.
A rare internal failure in the PCM’s EGR vent driver can produce an incorrect high voltage signal, but this is less common than component or wiring problems.
Usually not; most often the problem is the EGR vent control valve, its wiring, or a short, not the PCM itself.
Yes, carbon buildup can cause the valve to stick or operate erratically, leading to a P2145.
It may clear if the fault is intermittent, but the underlying issue typically remains until repaired.
Short‑term driving is generally safe, but prolonged operation can result in reduced performance and potential emissions test failure.