P0890
PowertrainTransmissionhigh severityTCM Power Relay Sense Circuit Signal Stuck On
What P0890 Means
The transmission control module sees the power relay sense signal stuck in the on state. The relay is not de-energizing when commanded off.
Symptoms
- Transmission warning light on
- Relay stays powered after key off
- Shifting problems
Common Causes
- Stuck TCM power relay
- Wiring short to power
- Corroded relay contacts
- Faulty transmission control module
Diagnostic Steps
- Scan for related transmission codes
- Test relay for stuck contacts
- Measure sense voltage during key off
- Inspect wiring for short to power
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