P0608Control Module VSS Output A
- Generic OBD-II code · Powertrain
- How the car detects it
- Many engine or powertrain modules turn the raw wheel or output-shaft speed into a cleaned-up vehicle speed signal and pass it on through their own driver – a square-wave signal whose frequency rises with speed – to the instrument cluster, cruise control, radio or steering. P0608 concerns output A: the module compares the commanded driver state with the actual line state and reports a short to ground or voltage, an open circuit or an internal driver fault, as CARB requires for output components. Output A is the first such output, usually the speedometer feed. If the speed sensor itself fails, P0500–P0503 set instead. No manufacturer table available to us gives thresholds; GM lists the code in older vehicles. On modern cars speed is shared over CAN, so the code mainly affects older vehicles with a hard-wired speedometer signal.
- What you may notice
- Speedometer dead or jumping
- Cruise control not working
- Odometer stops counting
- Speed-dependent functions (steering, radio volume) disturbed
- Likely causes
- LikelyShort or open in the output line A to the receiving module
- PossibleCorroded or spread connector pins at the module or receiver
- PossibleFaulty receiving module pulling the line to ground
- RareInternal driver fault in the module
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.