P0654low severityPowertrain
Engine RPM Output Circuit
on 2007 Ram 3500 5.9L I6 Cummins · 4WD
What this code means
The PCM detected a fault in the engine RPM output circuit that sends tachometer signals to external devices. The tachometer or connected accessories may not work correctly.
Symptoms
- Tachometer inoperative or erratic
- Accessory RPM devices not working
- Check engine light on
Common causes
- Wiring or connector fault
- Faulty tachometer or gauge
- Short or open in output circuit
- PCM driver failure
Diagnostic steps
- Read stored codes
- Inspect RPM output wiring
- Measure output signal at connector
- Test cluster and PCM circuit
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