Crankshaft Position Sensor "A" Circuit Malfunction
The crankshaft position (CKP) sensor signal is missing or implausible. The CKP is essential — without it the ECU cannot synchronise injection or ignition, and the engine will not start or will stall.
Affected components
- Crankshaft position sensor
- Reluctor ring
- Crankshaft position sensor wiring
Common causes
- High likelihood: Sensor failed (heat damage common)
- Low likelihood: Reluctor ring damaged or contaminated with metal debris
- Medium likelihood: Wiring or connector fault
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
- Reduced-power or limp mode may occur
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.