P0898
PowertrainTransmissionmoderate severityTransmission Control System MIL Request Circuit Low
What P0898 Means
The transmission control module is commanding the malfunction indicator lamp but the request circuit reads low voltage. This indicates a wiring or module communication fault.
Symptoms
- Check engine light behavior abnormal
- Transmission warning present
- Possible limp mode
Common Causes
- Short to ground in MIL request circuit
- Faulty transmission control module
- Damaged wiring or connectors
- PCM/TCM communication fault
Diagnostic Steps
- Check MIL request circuit for shorts to ground
- Inspect wiring and connectors at TCM
- Verify PCM and TCM communication
- Test module voltages and grounds
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