Powertrain, generic · Ignition system or misfire

P0335 Crankshaft Position Sensor A Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

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.

Likely causes

Crankshaft position sensor faulty (heat, age – typical hot-start failure)
Connector or wiring corroded, chafed, oil-soaked or open
5 V reference shorted by another sensor on the same supply
Tone wheel damaged, loose or clogged with chips; air gap wrong after engine work
Engine module

Symptoms

  • 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

Repair estimate

DifficultyMediumDIY possible
Parts and labour€60–400
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

What to check first

  1. Inspect sensor and connector
  2. Check signal while cranking
  3. Inspect the reluctor ring

Parts involved

crankshaft position sensorcrankshaft tone wheelsensor wiringengine control module

Related codes

P0336P0339P0322P0340P0016P2106

References: gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com, fordservicecontent.com.