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P1335

Crankshaft Position Sensor Circuit.

  • Geo
  • Powertrain
  • Manufacturer code
  • High severity

How this code is built

P
SystemPowertrain
1
Defined byThe manufacturer
3
AreaIgnition system or misfire
35
FaultThe specific fault in that area

What it means

On a Geo, P1335 refers to a fault in the crankshaft position (CKP) sensor circuit. The engine control unit has seen a missing, erratic or implausible crankshaft signal while the engine was cranking or running. Because the crank signal is used to time ignition and fuelling, the fault can cause stalling or a no-start.

Symptoms

  • Engine cranks but will not start
  • Engine stalls unexpectedly, often when warm
  • Intermittent misfire or hesitation
  • Rough running or surging
  • Check engine light on
  • Tachometer flicking or dropping to zero while running

Possible causes

  • Faulty crankshaft position sensor, often heat related and intermittentlikely
  • Damaged, chafed or corroded wiring between the sensor and the control unitlikely
  • Loose, corroded or contaminated sensor connectorlikely
  • Sensor air gap incorrect or sensor loose in its mountingpossible
  • Damaged reluctor wheel or trigger teeth, or metal debris on the sensor tippossible
  • Low battery voltage or poor earth or power supply to the sensor circuitpossible
  • Fault within the engine control unitrare

How to diagnose

  1. Read all stored and pending codes and note the freeze frame data, including engine speed, coolant temperature and whether the fault set while cranking or running
  2. Check for other related codes, such as camshaft sensor or misfire codes, which can point to a shared wiring or power fault
  3. Inspect the sensor, its connector and the wiring loom for chafing, oil contamination, heat damage, corrosion and bent or pushed-back pins
  4. Check the battery condition and charging voltage, and the relevant earths and supply fuses
  5. Check the sensor is secure and correctly seated, and inspect its tip for metal debris and the reluctor wheel for damage or missing teeth
  6. Check the sensor resistance or output signal against the specification for your engine, as values vary by model
  7. Wiggle-test the harness with the engine running or cranking while watching live engine speed data for dropouts
  8. Test the wiring for continuity, short circuits and shorts to earth or supply between sensor and control unit, using the wiring diagram for your model

How to fix

  • Replace the crankshaft position sensor with a correct specification part and fit it with the correct air gap if one is required
  • Repair or replace damaged wiring and renew corroded or damaged connector terminals
  • Clean or secure the connector and make sure it locks fully
  • Clear metal debris from the sensor area and repair or replace a damaged reluctor wheel
  • Restore good power and earth connections, and correct any battery or charging problem
  • Only after all other causes are ruled out, have the control unit tested and repaired or replaced as needed

Can I keep driving?

High severity

Avoid driving the car until it is fixed, as it may stall without warning, which is a safety risk in traffic and can leave you stranded. If it does start and run normally, limit driving to getting it to a workshop.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.

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