Code
P1356
DAEWOO
P — Powertrain
#6 MISFIRE CIRCUIT - SHORT
Views:
UK: 1
EN: 3
RU: 3
AI status
Completed
Completed
100%
Causes
- Damaged or pinched wiring harness to cylinder 6 ignition coil
- Corroded, loose or pushed-out connector pins at the coil or ECM
- Faulty ignition coil or coil pack module (internal short)
- Shorted ignition coil driver or damaged ECM output stage
- Water intrusion or contamination of coil boots or connector
- Aftermarket parts or previous improper repairs
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Rough idle or vibration, especially at idle
- Reduced engine power, hesitation or misfire under load
- Poor fuel economy and increased exhaust emissions
- Intermittent misfire codes or persistent P1356
- Possible hard start or stalling in severe cases
What to check
- Read and record freeze frame and misfire counts with a scan tool; clear code and retest
- Visual inspection of coil, boot, spark plug, and wiring for damage, oil, or moisture
- Swap coil from cylinder 6 with a known-good cylinder; see if code follows the coil
- Measure coil primary and secondary resistance and compare to specification
- Check connector pins for corrosion, bent pins, or poor contact
- Perform continuity and short-to-power/ground tests on the coil harness to the ECM connector
Signal parameters
- Coil primary resistance: typically ~0.5–2.0 ohms (varies by coil type)
- Coil secondary resistance: typically ~5k–15k ohms (varies by application)
- Battery supply voltage at coil connector: ~12 V (with ignition ON/run)
- ECM driver output: pulsed ground or voltage when firing (observe with scope)
- No continuous high current draw on coil circuit when key ON (except during firing)
Diagnostic algorithm
- Connect a scan tool, read live data and freeze frame; note when fault occurred and misfire counter for cylinder 6.
- Visually inspect coil #6, spark plug, boot and wiring for damage, contamination, or oil. Repair obvious physical damage.
- Swap the ignition coil from cylinder 6 with another cylinder. Clear codes and run engine. If the fault moves to the other cylinder, replace the coil.
- With ignition OFF, disconnect the coil connector and inspect pins for corrosion or damage. Wiggle harness while monitoring for intermittent faults.
- Measure coil primary and secondary resistances against published specs. Replace coil if out of range or shows short/open.
- Check for short-to-ground or short-to-battery on the coil supply and driver circuits using an ohmmeter (verify continuity to ECM pins per wiring diagram).
- Use a scope to observe the coil primary waveform while cranking/running to confirm proper driver pulses and to identify abnormal voltage spikes or missing pulses.
- If wiring and coil check good but ECU driver shows abnormal behavior, inspect ECM connector for damage and consider ECM bench test or replacement only after confirming wiring/coil faults are eliminated.
- After repair, clear codes and perform road test/scan tool verification to confirm code does not return and misfire counts are normal.
- Safety note: disconnect battery when performing major wiring repairs. Follow manufacturer service manual for ECM handling.
Likely causes
- Failed ignition coil on cylinder 6
- Wiring insulation chafed and shorting to ground or battery voltage near cylinder 6
- Corroded connector terminal at coil or harness splice
- ECM driver transistor failure (less common)
Fault status
Status
P1356 — Cylinder 6 misfire/ignition circuit short detected. ECM reports an electrical short or abnormal voltage in the ignition coil/driver circuit for cylinder 6, causing a misfire-related fault.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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