Code
P1360
HUMMER
P — Powertrain
Ignition Coil Group 2 Control Circuit
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in the coil group 2 control circuit
- Faulty ignition coil(s) in group 2
- Poor or corroded connector or pin at coil harness
- Blown fuse or faulty relay supplying coil power
- Poor ground or battery voltage supply to coils/ECM
- Faulty ECM/ignition driver output
Symptoms
- Check Engine lamp (MIL) illuminated
- Misfire(s) on one or more cylinders associated with coil group 2
- Rough idle or hesitation under load
- Reduced engine power or limp-home mode
- Poor fuel economy
- Hard starting or stalling in some cases
What to check
- Read stored codes and freeze frame data with a scan tool; note engine RPM, coolant temp and voltage at the time of failure
- Check for related misfire codes (P030x) and coil-specific codes (P035x)
- Visually inspect coil group 2 wiring, connectors and harness for damage, corrosion, heat damage or pin/terminal failure
- Check fuses and relays that feed ignition coils
- Backprobe coil group 2 connector with ignition off to verify power supply and ground presence
- Measure battery voltage at coil connector while cranking/starting
Signal parameters
- Expected coil primary voltage: near battery voltage at power supply (approx. 12V nominal; may vary 9–14V during cranking)
- Coil primary resistance (typical range, vehicle dependent): ~0.2–3 Ω (consult OEM spec for exact value)
- Coil secondary resistance (typical range, vehicle dependent): ~5 kΩ–15 kΩ (consult OEM spec)
- Driver output behavior: switching (pulsed) grounding or pulsed supply from ECM timed to ignition events; pulse frequency increases with RPM
- No continuity to battery when driver is inactive (no unintended short to B+) and no continuity to ground when inactive (no unintended short to ground)
Diagnostic algorithm
- Retrieve P1360 and any related codes, record freeze frame. Identify which cylinders or coils are included in "group 2" from vehicle service literature.
- Visually inspect coil group 2 harness, connectors and terminals for corrosion, bent pins, water, or physical damage.
- With ignition OFF, measure coil connector terminals: verify unswitched battery feed and ground circuits per wiring diagram. Check fuse/relay feeding coils.
- With a DVOM, measure coil primary resistance and compare to OEM specification. If out of range, replace the coil.
- Backprobe the coil control (driver) pin with a lab scope or scan-tool pattern while cranking/running. Verify driver pulses (voltage transitions) and compare waveform to a known-good channel or spec.
- Swap the suspect coil with a known-good coil of the same type (within the same group) and clear codes. If the code/misfire follows the coil, replace the coil. If it stays on the same cylinder group, suspect wiring/ECM.
- Check for short to battery or ground on the control wire (pin-to-pin continuity and resistance). Wiggle the harness to check for intermittent faults.
- If wiring is good and coil is known good, command the coil driver with a scan tool (if supported) and re-check waveform/response. If driver does not respond correctly, suspect ECM or driver transistor failure and follow OEM procedures for ECM testing/repair.
- After repair, clear codes and perform a test drive to confirm the fault does not return.
Likely causes
- Damaged ignition coil(s) in group 2
- Open or shorted driver wire between ECM and coil group 2
- Corroded/loose connector at coil pack
- Failed ECM ignition driver transistor for group 2
Fault status
Status
P1360 — Ignition Coil Group 2 Control Circuit: ECM detected abnormal driver circuit for ignition coil group 2 (open/short/driver fault).
Repair difficulty: Medium
Diagnostic time: 0.5-3 hours
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Repair manuals
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138
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