KlaroFault codeP0609
MODERATEControl Module VSS Output B Malfunction
What this code means
Control Module VSS Output B Malfunction.
P0609 is a generic code: it means the same thing on every make. P0609 belongs to family P06xx — Control unit and output circuits. Its page explains how to read a code and groups all its codes by part.
Engine control unit
These codes concern the engine control unit itself: its memory, its processor, its programming or its communication with the other modules. It runs a self-check every time it starts and records a code when one of its tests fails.
What you notice
From nothing at all to an engine that will not start, depending on the fault; other warning lights may come on at the same time.
How to check it
Before suspecting the unit, check its power supplies and grounds, the battery and its terminals: a weak or unstable voltage causes many of these faults. Some codes appear after an update or a repair with the battery disconnected and clear by themselves. A unit that is really faulty is repaired or replaced and reprogrammed by a specialist.
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
- 09P0609
Other codes for the same part
- P0600Serial Communication Link Malfunction
- P0601Internal Control Module Memory Check Sum Error
- P0602Control Module Programming Error
- P0603Internal Control Module Keep Alive Memory (KAM) Error
- P0604Internal Control Module RAM Error
- P0605Internal Control Module ROM Error (Module Identification Defined by SAE J1979)
- P0606PCM Processor Fault
- P0608Control Module VSS Output A Malfunction
- P2610ECM/PCM Internal Engine Off Timer Performance
