Volvo Land Rover Error Code P1387: How to Fix It

Q: What does error code P1387 mean?

P1387 indicates an internal fault in the engine knock control module, which is typically part of the engine control module (ECM). It means the ECM has detected a malfunction in its knock control circuitry.

Q: Can I drive with a P1387 code?

Possible but not recommended. The vehicle may enter limp mode, reducing performance and fuel economy. Prolonged driving could cause engine damage if knock goes undetected.

Q: How do I fix P1387 on a Volvo or Land Rover?

Start by checking knock sensor wiring and resistance, then inspect engine grounds. If those are fine, the ECM may need replacement or reprogramming. Professional help is often needed.

Q: Is P1387 serious?

Yes, it can lead to engine knocking and potential damage if ignored. It's considered a high-severity code.

Q: Can a bad knock sensor cause P1387?

Yes, a faulty knock sensor or its wiring can trigger P1387. The ECM may detect a circuit issue and set this code.

Abstract

Error code P1387 indicates a problem with the engine knock control internal control module, which monitors engine vibrations to prevent knocking. This can cause poor performance, reduced fuel economy, or limp mode. Here's how to diagnose and fix it.