Faulty ignition control module (ICM) or ignition coil; Damaged or corroded wiring in the ignition control circuit; Poor electrical connection at the ICM or ECM; Failed crankshaft position sensor or camshaft position sensor; ECM internal fault affecting ignition control output; Ignition switch or related power supply issue

DTC codes / GM codes / P1350

P1350 · GMIgnition Control System

Q: What does code P1350 mean?

Ignition Control System. P1350 on GM vehicles indicates that the ignition control system has detected a fault, typically a problem with the ignition control circuit or module that manages spark timing. The engine computer (ECM) monitors the ignition control signal and sets this code when the signal is out of expected range or missing, which can cause misfires or a no-start condition.

P1350 on GM vehicles indicates that the ignition control system has detected a fault, typically a problem with the ignition control circuit or module that manages spark timing. The engine computer (ECM) monitors the ignition control signal and sets this code when the signal is out of expected range or missing, which can cause misfires or a no-start condition.

SystemPowertrain

Code typeGM specific

SeverityMedium

Fix difficultyIntermediate

AreaIgnition system and misfire

Symptoms you may notice

Engine may misfire or run rough, especially under load
Check Engine Light (CEL) illuminated
Engine may stall or hesitate during acceleration
Difficulty starting or a no-start condition
Often no symptoms besides the warning light, especially if the fault is intermittent

Common causes, most likely first

Faulty ignition control module (ICM) or ignition coil
Damaged or corroded wiring in the ignition control circuit
Poor electrical connection at the ICM or ECM
Failed crankshaft position sensor or camshaft position sensor
ECM internal fault affecting ignition control output
Ignition switch or related power supply issue

How to diagnose and fix it

Inspect the ignition control circuit wiring and connectors for damage or corrosion
Check for technical service bulletins (TSBs) related to P1350 for your specific GM model
Test the ignition control module and ignition coil according to the service manual
Verify the crankshaft and camshaft position sensors are functioning properly
Check powers and grounds at the ICM and ECM
If all else fails, diagnose the ECM for internal faults

Common Misdiagnosis Traps for P1350

A loose or corroded ground connection at the ignition control module can mimic a failed module, so always check grounds before replacing parts.
Intermittent faults often stem from chafed wiring harnesses near hot exhaust components, which may not be obvious during a visual inspection.
A failing crankshaft position sensor can set P1350 without setting its own code, so test it thoroughly if the ignition system checks out.
Aftermarket alarm or remote start systems improperly installed can interfere with the ignition control circuit and trigger this code.
The ECM may store P1350 due to low battery voltage during cranking, so always verify battery and charging system health first.

Can I keep driving with P1350?

If the engine is running smoothly, you can drive cautiously to a repair shop, but avoid heavy acceleration or long trips. If the engine misfires severely or stalls, stop driving and have the vehicle towed to prevent damage to the catalytic converter or other components.

Tools that help

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Guidance is general and written for GM vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.