Timing Reference High Resolution Signal A Too Few Pulses
Timing reference signal A delivers fewer pulses per crank revolution than expected — broken reluctor teeth, sensor air gap too wide, or tone wheel chipped.
Affected components
- Crankshaft position sensor
- Flywheel
Common causes
- High likelihood: Tone wheel teeth broken or sensor gap excessive
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
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.