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.
Affected components
- Ecm
- Vehicle speed sensor
Common causes
- High likelihood: ECM output stage fault
- Medium likelihood: Signal path to consumers faulty
Possible symptoms
- Check engine light on
- Possible limp mode or no-start
- Multiple follow-up faults across modules
- Reset/relearn may be needed after repair
Diagnostic notes
- The malfunction indicator lamp may illuminate
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.