OBD-II Generic Error Code P0890: How to Fix It

Q: Can I drive with a P0890 code?

It's not recommended. The TCM may not function properly, leading to erratic shifting or no transmission operation. Continuing to drive could cause transmission damage.

Q: What does TCM power relay sense circuit low mean?

It means the TCM detects voltage lower than expected (below a threshold) at the sense pin that monitors the power relay output. This suggests the relay is not providing full battery voltage to the TCM.

Q: Is P0890 a common code?

It's relatively uncommon but can occur on many vehicle makes. It often points to a bad relay or wiring issue rather than a failed TCM.

Q: How do I clear code P0890 after repair?

Use an OBD2 scanner to clear the code, or disconnect the battery for 10 minutes. If the underlying issue is fixed, the code should stay cleared.

Q: Will a bad battery cause P0890?

Possibly. A weak battery or poor connection at the battery terminals can cause low voltage conditions. Ensure battery voltage is at least 12.6V and connections are clean and tight.

Abstract

Error code P0890 means your car's Transmission Control Module (TCM) detects a low voltage condition in the power relay sense circuit. This often points to a faulty relay, wiring issue, or a failing TCM. We'll guide you through diagnostic steps to find and fix the problem.