KlaroFault codeP0654
MODERATEEngine RPM Output Circuit Malfunction
What this code means
Engine RPM Output Circuit Malfunction.
P0654 is a generic code: it means the same thing on every make. P0654 belongs to family P06xx — Control unit and output circuits. Its page explains how to read a code and groups all its codes by part.
Type of fault
The control unit has detected an electrical anomaly on this circuit without saying exactly which. Diagnosis starts with a visual check of the wiring and connector, then measuring the component — resistance, supply, ground — with a multimeter.
Dashboard signals from the engine control unit
The control unit drives some signals on the dashboard itself: the check engine light, the rev counter, the temperature warning or other warning lights. These codes mean it found a fault in one of these output circuits.
What you notice
A warning light that stays off or on, a rev counter that does not work; the engine runs normally.
How to check it
Check the connectors and the wiring between the control unit and the instrument cluster, and the cluster itself. On a modern car these signals often travel over the vehicle network: other modules may report communication codes at the same time.
What to do
Have it checked this week. The car remains usable, but the fault will not clear itself and will fail the roadworthiness test.
Clearing a code switches the light off but repairs nothing: if the fault remains, the code comes back. Clearing a fault code yourself →
How to read this code
- PPowertrain
- 0standardised code
- 6Control unit and output circuits
- 54P0654
