Code
P1335
SATURN
P — Powertrain
CKP Circuit
AI status
Completed
Completed
100%
Causes
- Open or shorted CKP sensor wiring or connector
- Corroded or loose connector pins
- Failed or damaged CKP sensor (magnetic or Hall type)
- Damaged or missing teeth on the reluctor/trigger wheel
- Faulty ground or reference voltage供 to sensor
- PCM input circuit fault or internal PCM failure
Symptoms
- Engine cranks but does not start, or hard-start condition
- Intermittent stalling or no-start
- No or erratic tachometer signal
- Misfiring or rough idle
- Reduced engine performance or limp-home mode
- Possible illumination of Check Engine Light (CEL) with P1335 stored
What to check
- Read freeze-frame data and scan for additional codes (P0335, P0340, misfire codes)
- Visually inspect CKP sensor connector, wiring harness and connector pins for corrosion, damage, or pushed-out pins
- Check battery voltage and charging system condition
- Back-probe sensor connector while cranking: measure reference voltage (if active/hall), signal and ground
- Measure CKP sensor resistance (for 2/3-wire sensors) per service spec and compare
- Check continuity from sensor connector to PCM and for shorts to power/ground
Signal parameters
- Hall-effect (active) CKP: square wave, 0–5 V (logic), reference 5 V supply and ground; frequency increases with rpm
- Magnetic (passive) CKP: AC sine/alternating waveform, amplitude typically 0.5–12 VAC depending on rpm
- Typical idle frequency: low Hz; waveform should be consistent and show distinct teeth pulses per crank revolution
- No open circuit between sensor ground and chassis ground; reference supply present if active sensor
Diagnostic algorithm
- Retrieve freeze-frame data and note conditions when code set. Check for additional stored codes.
- Visually inspect CKP sensor area, wiring, and connector for damage, rubbing, corrosion, or oil contamination. Repair as needed.
- With key off, wiggle harness at sensor while monitoring connector continuity to look for intermittent opens/shorts.
- Measure sensor resistance (if applicable) and compare to spec. Replace sensor if out of range.
- Back-probe sensor connector: verify reference voltage (for active sensors), ground continuity, and signal while cranking. Reference should be stable and signal should show pulses.
- Use an oscilloscope (preferred) to view CKP waveform while cranking and running. Look for missing pulses, weak amplitude, noise, or distorted waveform.
- Inspect trigger wheel/reluctor for missing or damaged teeth, debris, or rubbing. Replace or repair as required.
- Check wiring continuity from sensor connector to PCM. Repair any opens or shorts to power/ground.
- If wiring and sensor check good but no proper signal, verify PCM input circuit. If PCM input is suspected, confirm with manufacturer procedures before replacing PCM.
- Clear codes and perform test drive or crank tests to confirm repair. If intermittent, perform longer drive cycles and re-scan.
Likely causes
- Damaged wiring or poor connector connection at the CKP sensor (most common)
- Failed CKP sensor
- Damaged/dirty reluctor ring or missing teeth
- Poor sensor reference or ground
- PCM fault (least common)
Fault status
Status
P1335 — CKP (Crankshaft Position) Sensor Circuit: PCM detects no, intermittent, or out-of-range crank sensor signal. Check sensor, wiring, connector, reluctor, and PCM input circuit.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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