TorqueMech OBD Code Guide
P0738 - TCM Engine Speed Output Circuit Low
The TCM engine speed output circuit signal is lower than expected.
Code Overview
The TCM engine speed output circuit signal is lower than expected.
Common Causes
- Transmission sensor, solenoid, or switch fault
- Damaged wiring or connector
- Internal transmission or control-module issue
Diagnostic Steps
- Check transmission fluid condition and supporting codes
- Inspect the related connector and harness
- Compare commanded operation to live scan data if supported
Likely Repairs & Cost Guides
Use test results to confirm the fault before pricing the repair.
Open EstimatorRelated OBD Codes
Browse the closest code-family pages when the same fault pattern often shows up nearby.
Next Steps
Move from the code to a diagnosis path, then into repair pricing once the fault is confirmed.