What does it mean?
P1349 is a Powertrain (engine, transmission, fuel system) fault code. It indicates: Ignition Coil Control Circuit . This is a standardised OBD-II code. The technical definition is the same regardless of the make or model of vehicle, although specific causes and symptoms can vary between vehicles.
Symptoms
- Misfire, rough running and vibration at idle
- Check engine light on and flashing when the misfire is severe
- Hesitation, reduced power and poor acceleration
- Difficult starting or, if several coils share the affected circuit, a no-start
- Fuel smell from the exhaust and increased consumption
Likely causes
- Open, shorted or high-resistance coil control wire between the module and the coil
- Failed ignition coil with an open or shorted primary winding
- Loose, corroded or water-filled coil connector
- Missing or weak power supply to the coil, for example a failed relay, fuse or feed splice
- Poor engine or module ground raising the reference of the control circuit
- Harness damage where the coil leads pass hot or moving components
- Failed coil driver inside the control module, considered after the external circuit is verified
How to fix it
- Determine which coil the code refers to from the wiring information for that engine
- Inspect the coil connector and harness for corrosion, moisture, chafing and pushed-back terminals
- With the key on, confirm battery voltage is present at the coil supply pin
- Measure the coil primary resistance and compare it with the other coils fitted
- Check the control wire for continuity to the module and for shorts to ground or to voltage
- Use a scope or a suitable test light to verify the module is actually switching the control circuit during cranking
- Replace the coil if it fails testing, repair any wiring fault found, and only then evaluate the module driver