P0889
PowertrainTransmissionhigh severityTCM Power Relay Sense Circuit Range/Performance
What P0889 Means
The transmission control module detects that the power relay sense signal is out of the normal expected range. The voltage reading doesn't match commanded relay state.
Symptoms
- Transmission warning light on
- Intermittent shifting issues
- Possible limp mode
Common Causes
- Failing TCM power relay
- Loose or corroded connections
- Intermittent wiring fault
- Faulty transmission control module
Diagnostic Steps
- Scan for related transmission codes
- Inspect relay and connectors
- Monitor sense circuit while cycling relay
- Check wiring for intermittent faults
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