Code
P0360
GWM
P — Powertrain
- Ignition coil primary / secondary circuit malfunction J
Views:
UK: 1
EN: 4
RU: 0
AI status
Completed
Completed
100%
Causes
- Faulty ignition coil (internal open/short)
- Broken, chafed, or shorted wiring/harness to the coil
- Corroded or loose coil connector or pin(s)
- Poor battery/ignition voltage supply or ground at the coil
- Faulty ignition driver in PCM/ECM
- Water intrusion or contamination of connector/coil
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Engine misfire on the affected cylinder (rough idle)
- Reduced engine power and acceleration
- Poor fuel economy and increased emissions
- Possible hard starting or stumble under load
- Occasional audible backfire or popping
What to check
- Read freeze-frame and live data with a scan tool; note misfire counters and coil status
- Check for additional related DTCs (misfire codes P03xx)
- Visual inspection of coil, connector, wiring harness for damage, corrosion, oil or water
- Perform wiggle test on wiring/connectors while monitoring live data for intermittent changes
- Measure coil primary and secondary resistance with a multimeter (compare to specification)
- Verify proper supply voltage to the coil connector (battery voltage with key ON/cranking) and good ground
Signal parameters
- Typical primary resistance (varies by coil type): ~0.2–2.0 Ω (consult GWM spec)
- Typical secondary resistance (varies): ~2 k–20 k Ω depending on coil design
- Coil primary dwell/pulse: dwell time typically 1–4 ms (depends on engine speed/load)
- Supply voltage at coil connector: near battery voltage (~11–14 V) when cranking/engine running
- Oscilloscope primary waveform: clean square/triangular current ramp and sharp collapse spike on secondary; missing or abnormal waveform indicates driver/coil/harness issue
Diagnostic algorithm
- Connect an advanced scan tool and record freeze-frame + live data; note misfire counts and if code is continuous or intermittent.
- Clear codes and perform a controlled test drive or crank to see if P0360 returns.
- Visually inspect coil "J", connector, and wiring for damage, corrosion, oil or water. Repair visible issues.
- Check supply voltage and ground at the coil connector with key ON and while cranking. Repair poor supply or ground.
- Measure coil primary and secondary resistance and compare to GWM service specifications. Replace coil if out of spec.
- Swap the suspect coil with a known-good coil from another cylinder. If the code or misfire moves with the coil, replace the coil.
- If swapping does not move the fault, backprobe the coil driver circuit and capture primary waveform with an oscilloscope to evaluate PCM driver output and look for shorts/opens.
- If driver output is missing or abnormal and wiring is good, suspect PCM/ECM driver fault—verify with manufacturer diagnostics and consider module repair/reprogramming per GWM procedures.
- After repair, clear codes and perform verification drive to ensure code does not return and misfire is resolved.
Likely causes
- Failed ignition coil unit for cylinder J
- Damaged connector or wiring causing intermittent/open/short
- Weak or missing ground or supply voltage to the coil
- PCM driver failure (less common)
Fault status
Status
Ignition coil primary/secondary circuit malfunction detected for coil 'J' — possible open/short, poor supply/ground, or driver failure.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
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