Code
P0376
GWM
P — Powertrain
- The number of pulses of the timer B signal is higher than the norm
AI status
Completed
Completed
100%
Causes
- Damaged or contaminated cam/crank (Timer B) sensor
- Faulty or bent trigger/reluctor wheel (extra/missing teeth or metal debris)
- Short to voltage in the sensor signal circuit
- Intermittent/poor connector or grounding at the sensor or PCM
- Incorrect timing (timing chain/belt jumped) or mechanical timing misalignment
- Aftermarket or incorrect trigger wheel installed
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Engine runs rough, misfires or has unstable idle
- Hard start or no-start conditions
- Reduced engine power or limp-home mode
- Intermittent stall or surging
- Possible multiple related DTCs for cam/crank correlation
What to check
- Read freeze frame data and all stored codes; note engine speed and conditions when DTC set
- Attempt to reproduce fault and record live data for cam/crank/Timer B signals with a scan tool
- Visually inspect sensor connector, wiring harness and grounds for damage, corrosion or pin damage
- Inspect the trigger/reluctor wheel (tone ring) for missing/bent teeth or debris
- Use an oscilloscope to capture the Timer B waveform at idle and cranking — compare to good waveform/pattern
- Backprobe sensor and check voltage reference, signal, and ground with multimeter (or scope)
Signal parameters
- Expected pulse pattern and pulse count for Timer B is manufacturer-specific — consult GWM service data
- Typical signal type: square/AC waveform from cam/crank position sensor (Hall or VR)
- Signal amplitude: Hall sensors ≈ 0–5 V (digital), VR sensors vary with engine speed (mV to volts)
- Pulse frequency increases with engine RPM; compare live pulses/sec at known RPM to spec
Diagnostic algorithm
- Retrieve and record all DTCs and freeze frame data. Erase codes and attempt to re-create the condition under similar operating conditions.
- Visually inspect connector, wiring harness and sensor mounting for damage, corrosion, chafing or loose pins. Repair any issues found.
- Inspect the trigger/reluctor wheel and surrounding area for missing/bent teeth, metal debris or foreign material. Correct or replace as required.
- Use a lab-quality oscilloscope to capture the Timer B signal waveform at the sensor while cranking and at idle. Compare pulse count/shape to manufacturer reference or a known-good waveform.
- If waveform shows extra pulses, isolate by disconnecting the sensor (engine not running) and checking for induced signals or shorts in wiring. Check for short to +12V on the signal circuit.
- Verify sensor supply power and ground at the connector with ignition ON. Replace sensor if supply is correct but waveform is bad.
- Check mechanical timing (timing chain/belt alignment) if trigger wheel appears correct; repair timing if it has jumped.
- If wiring and sensors pass, consider PCM input diagnostics or replacement per manufacturer guidance.
- After repair, clear codes and road-test to confirm the code does not return.
Likely causes
- Damaged trigger/reluctor wheel (bent tooth, debris)
- Failing cam/crank position sensor producing spurious pulses
- Shorted wiring or poor connector causing multiple pulses to be seen by the PCM
Fault status
Status
Timer B signal pulse count higher than expected — control module detected extra pulses on the timing/trigger input. Possible sensor, trigger wheel, wiring short, or PCM input issue.
Repair difficulty: Medium
Diagnostic time: 1.5-4.0 hours
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