P0737
PowertrainTransmissionmoderate severityTCM Engine Speed Output Circuit
What P0737 Means
There is a fault in the engine speed output circuit from the transmission control module. This circuit relays RPM information used for control functions.
Symptoms
- Erratic shifting
- Check engine light on
- Possible RPM-related driveability issues
Common Causes
- Wiring fault in output circuit
- Corroded or loose connector
- Faulty TCM
- Related sensor fault
Diagnostic Steps
- Scan codes and freeze frame
- Inspect output circuit wiring and connectors
- Test circuit continuity and voltage
- Replace TCM if circuit checks good
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Budget handheld~$40
ANCEL AD410 →
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Serious DIY~$100
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Autel MaxiSys MS906 Pro →
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✓ Autel official store
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