P0335Crankshaft Position Sensor A Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- The crankshaft position sensor reads a tone wheel with a reference gap (GM 58X, i.e. 60-2; Ford 36-1, 40-1 or 60-2) and gives the engine module speed and crank angle for injection and ignition. P0335 means it delivers no pulses although the engine demonstrably turns. GM proves the rotation via starter, camshaft pulses or airflow above 1.5 g/s and sets the code after at least 4 s of cranking or 0.3 s while running without a crank pulse (2 of 10 revolutions); petrol engines after two trips, the LML diesel in the first. Ford compares with the camshaft: more than one revolution without a crank signal, detected within 5 s. Without the signal the engine stalls or does not start; GM Global A engines (Saab 9-5 2010) keep running only with learned cam positions. A hot sensor that fails and recovers after cooling is typical.
- What you may notice
- Engine cranks but does not start
- Engine stalls while driving or at idle
- Hot-start problem: starts again after cooling down
- Tachometer drops out, check engine light on
- Likely causes
- LikelyCrankshaft position sensor faulty (heat, age – typical hot-start failure)
- LikelyConnector or wiring corroded, chafed, oil-soaked or open
- Possible5 V reference shorted by another sensor on the same supply
- PossibleTone wheel damaged, loose or clogged with chips; air gap wrong after engine work
- RareEngine module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €60 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.