OBD-II code · Powertrain (generic)
P0608 Control Module VSS Output A
The vehicle speed signal output from the control module to other systems is faulty. Other modules expect a speed signal that the ECM no longer provides correctly.
Is it safe to drive with P0608?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyECM output stage fault
- PossibleSignal path to consumers faulty
Symptoms
- Check engine light on
- Possible limp mode or no-start
- Multiple follow-up faults across modules
- Reset/relearn may be needed after repair
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–4 h
- Emissions test
- Usually unaffected
- Parts involved
- Ecm, Vehicle Speed Sensor
Related codes
- P0500Vehicle Speed Sensor "A" Malfunction
- P0501Vehicle Speed Sensor "A" Range/Performance
- P0607Control Module Performance
- P0609Control Module VSS Output B
- P0605Internal Control Module Read Only Memory (ROM) Error
- P0606ECM/PCM Processor Fault
- P060AInternal Control Module Monitoring Processor Performance
- P060BInternal Control Module A and D Processing Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.