Code
P1335
CHEVROLET
P — Powertrain
CKP Circuit
Views:
UK: 27
EN: 50
RU: 31
AI status
Completed
Completed
100%
Causes
- Failed or intermittent crankshaft position (CKP) sensor
- Open, shorted or corroded wiring or connector in the CKP circuit
- Damaged, missing or misaligned reluctor/tone ring
- Oil/metal debris or contamination on the sensor or reluctor
- Poor sensor reference power or ground (PCM or wiring issue)
- Intermittent PCM input or internal PCM fault
Symptoms
- Check Engine Light (MIL) illuminated
- Hard starting or no-start condition
- Intermittent stalling or failure to restart
- Rough idle, misfire or reduced engine power
- Engine cranks but won’t run or runs erratically
- Possible limp-in mode or drivability restrictions
What to check
- Retrieve freeze frame and live data with a scan tool; confirm P1335 and any related codes
- Visually inspect CKP sensor, connector, and harness for damage, corrosion, oil or contaminants
- Inspect reluctor/tone wheel for missing or damaged teeth and correct alignment
- Backprobe sensor connector and verify reference power and ground (if applicable)
- Measure sensor output while cranking (multimeter AC for VR sensors, DC/square wave for Hall sensors)
- Perform wiggle test on harness and connector while monitoring live signal to reproduce fault
Signal parameters
- Hall-effect type: digital square wave 0–5 V (signal low near 0 V, high near 5 V); frequency increases with RPM
- Variable-reluctance (VR) type: AC sine waveform; amplitude typically ~0.2–1.5 VAC at cranking, higher at increased RPM
- Reference supply: often 5 V or switched supply depending on sensor type—verify service data for vehicle
- Typical resistance (for some VR sensors): ~200–1,500 ohms depending on design (refer to OEM spec)
Diagnostic algorithm
- Verify P1335 with a scan tool, note freeze frame and any other stored codes.
- Visually inspect CKP sensor, connector, and harness for damage, corrosion, oil contamination, or rodent chew. Repair as needed.
- Inspect the reluctor/tone wheel for missing or damaged teeth and correct mechanical alignment or replace as required.
- Backprobe the sensor connector: verify reference voltage (if Hall), ground continuity, and signal while cranking. Compare to OEM values.
- Measure sensor output: for VR sensors use AC volts while cranking; for Hall sensors check for a pulsed 0–5 V signal with cranking. Use an oscilloscope if available to confirm waveform integrity.
- If wiring or connector faults are found, repair wiring and connectors (splice/replace harness, apply dielectric grease).
- If sensor tests out of spec, replace the CKP sensor and retest.
- If wiring and sensor are good but signal is missing at PCM, check PCM connector pins and grounds; consider PCM diagnosis or replacement only after eliminating wiring/sensor issues.
- Clear codes and road test; monitor live data and confirm the P1335 does not return.
Likely causes
- CKP sensor failed
- Damaged/chafed wiring or short to ground/power at CKP harness
- Corroded/loose connector at sensor or PCM
- Missing/broken reluctor teeth or reluctor contact damage
Fault status
Status
MIL (Check Engine Light) set and P1335 stored in memory. Engine may experience no-start, stalling, misfire or limp mode until fault is corrected.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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