Code
P1359
HUMMER
P — Powertrain
Ignition Coil Group 1 Control Circuit
AI status
Completed
Completed
100%
Causes
- Open or high-resistance wiring in coil group 1 control circuit
- Short to ground or short to battery in coil driver wiring
- Corroded or poorly seated connector at ignition coil(s) or PCM
- Failed ignition coil(s) in group 1
- Blown fuse or faulty power supply to coils
- Faulty PCM/ECM ignition driver transistor
Symptoms
- Check Engine Light (MIL) illuminated with stored P1359
- Rough idle or intermittent misfire(s) affecting cylinders in group 1
- Reduced engine power and poor acceleration
- Hard starting or stalling in severe cases
- Increased fuel consumption and elevated emissions
- Possible fuel trim abnormalities or misfire-related codes (P030x)
What to check
- Read and record freeze frame and all stored/related codes (include pending/multiple misfire codes)
- Visually inspect coil pack(s), connectors, and wiring for corrosion, damage, or moisture
- Verify power and ground at the coil group 1 connector with key ON (backprobe connector)
- Check for continuity between PCM coil driver pin and coil connector control pin; inspect for shorts to ground or B+
- Measure coil primary and secondary resistance with manufacturer limits where available
- Perform wiggle test on harness/connectors while monitoring for code set or misfire
Signal parameters
- Coil group 1 supply: battery voltage (approx. B+) present at coil positive terminal with key ON
- Coil primary switching: PCM normally switches primary to ground (0V pulses) — observe rapid transitions between ~0–12 V when firing
- Dwell/pulse width varies with engine speed/load; pulses present when engine cranks and runs
- Primary resistance: typical low-impedance coil primary often
- If driver is open: control line may show steady B+ or open (no switching). If shorted to ground: control line stuck near 0V.
Diagnostic algorithm
- Confirm P1359 is current/pending and record any related misfire codes (P03xx). Clear codes and attempt to reproduce.
- Step 1 — Visual: Inspect coils, boots, connectors, and harness for damage, corrosion, or contamination (oil/water). Repair as needed.
- Step 2 — Power/Ground: Backprobe coil group 1 connector. With key ON, verify battery voltage at coil power terminal and a good ground. Check related fuses/relays.
- Step 3 — Connector/Wiring: With ignition OFF, check continuity between coil control pin and PCM coil driver pin. Check resistance to ground and B+ to detect shorts.
- Step 4 — Coil test: Measure primary and secondary resistances of each coil in group 1. If spec out of range or intermittent, replace coil. If multiple coils share group, consider swapping coils to see if code follows coil.
- Step 5 — Dynamic test: Crank/run engine and use a lab scope or a high-speed voltmeter to observe coil primary waveform and driver switching. Look for missing pulses, collapsed waveform, or abnormal dwell.
- Step 6 — PCM output: If wiring and coils check OK but no driver switching, test PCM driver output per service manual. Replace PCM only after confirming external circuit integrity and following diagnostic procedures.
- Step 7 — Verify repair: Clear codes and test drive to confirm P1359 does not return and that misfire symptoms are resolved.
Likely causes
- Corroded/loose connector at coil pack or coil-on-plug unit for group 1
- Open or chafed control/trigger wire between PCM and coil group 1
- Failed ignition coil primary winding or internal short
- PCM driver transistor intermittent or failed after a short
- Blown ignition fuse or relay supplying coil group 1
Fault status
Status
PCM detected a fault in the ignition coil group 1 control circuit (P1359). The driver circuit shows abnormal/open/short behavior; MIL illuminated.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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