P0335

Code

ISUZU P — Powertrain

Crankshaft Position Sensor Circuit

Brand: ISUZU

Type: P — Powertrain

Views: UK: 15 EN: 24 RU: 20

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Page language: EN

Causes

Failed/cracked/fouled crankshaft position sensor
Open, shorted or corroded wiring or connector in CKP circuit
Damaged or missing crankshaft reluctor/trigger wheel teeth
Excessive sensor air gap or misaligned sensor
Poor engine or sensor ground
Intermittent connector or pin damage

Symptoms

Check Engine/Malfunction Indicator Lamp (MIL) illuminated
No-crank or no-start condition (engine cranks but does not run)
Intermittent stalling or rough idle
Poor acceleration, misfires or reduced engine power
Erratic RPM or tachometer behavior
Reduced fuel economy or drivability issues

What to check

Retrieve code and freeze frame data with a scan tool; check for stored related codes (cam/crank correlation, misfire).
Visual inspection of CKP sensor, harness and connector for damage, corrosion, oil or debris.
Check connector terminals for tightness and continuity; unplug and inspect pins.
Measure sensor supply/reference (if Hall-type) and ground with a multimeter per service manual.
Measure sensor signal with an oscilloscope while cranking/running to observe waveform and amplitude.
Check resistance of the sensor (for VR/inductive type) and compare to factory spec.

Signal parameters

Hall-effect type: square wave digital signal, typically 0–5 V (signal switches between ~0 V and ~Vref), frequency proportional to engine speed.
Variable reluctance (VR) type: sinusoidal/AC signal; amplitude increases with RPM (low RPM/crank ~0.2–2 V AC, higher RPM several volts AC).
Pulse frequency: depends on number of teeth on the reluctor; compare pulses per crankshaft revolution to service data.
Signal should be a clean, consistent waveform with no long dropouts, collisions or noise when cranking and at idle.

Diagnostic algorithm

Connect a scan tool, confirm P0335 and note any related codes (P0336, P0338, camshaft position faults). Record live data and attempt to view CKP sensor signal if available.
Perform visual inspection of CKP sensor, connector and wiring harness from sensor to ECM. Repair obvious damage/corrosion before further testing.
Backprobe the sensor connector: check reference power (if applicable) and ground continuity to chassis/ECM ground. Repair poor grounds.
Measure sensor resistance (for VR sensors) and compare to manufacturer specification. If resistance is open or shorted, replace sensor. If unknown, consult repair manual.
Use an oscilloscope or lab scope to monitor the CKP signal while cranking and while running. Look for consistent pulses, correct amplitude and shape. If signal missing or erratic, suspect sensor, reluctor or wiring.
Inspect the reluctor/tone wheel for missing/bent teeth, rust or debris. Verify proper sensor air gap and mounting location; adjust or replace as required.
Perform a harness continuity and short test between the sensor signal and ECM pin; check for shorts to battery or ground.
If wiring, connector and sensor check good but signal still incorrect, consider ECM pin/connector inspection and, if necessary, swap with known-good ECM or consult manufacturer for ECM tests.
After repair, clear codes and perform a road/crank test to verify the fault does not return and engine runs normally.

Likely causes

Connector corrosion or loose pin at CKP sensor
Open/short in sensor signal or power feed harness (abrasion, rodent damage)
Failed CKP sensor (electrical or magnetic pickup failure)
Damaged or shifted reluctor ring or tone wheel
Incorrect sensor mounting height (air gap) or sensor physical damage

Fault status

⚠️ Status

ECM detected abnormal or missing crankshaft position sensor signal. P0335 stored; MIL illuminated. Engine may not start or may run poorly until fault is corrected.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5–2.0 hours

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P0335 — Crankshaft Position Sensor Circuit