P0887
PowertrainTransmissionhigh severityTCM Power Relay Sense Circuit Low
What P0887 Means
The transmission control module detects a low voltage signal on the power relay sense circuit. This means the module isn't seeing expected voltage from its power relay.
Symptoms
- Transmission warning light on
- Harsh or delayed shifts
- Transmission may enter limp mode
Common Causes
- Faulty TCM power relay
- Corroded or loose relay connectors
- Wiring short to ground on sense circuit
- Failing transmission control module
Diagnostic Steps
- Scan for related transmission codes
- Check TCM power relay and connections
- Measure voltage on sense circuit with meter
- Inspect wiring for shorts or damage
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