P1355
Ignition Coil "A" Primary Circuit Fault (Ford)
Severeignition
Overview
The P1355 code means the PCM has detected a ignition coil "a" primary circuit fault (ford) condition. This diagnostic trouble code relates to the ignition system, which is critical for proper combustion in the engine cylinders. When this code is triggered, one or more cylinders may not be firing correctly, leading to rough running, power loss, and potential catalytic converter damage if not addressed.
Symptoms
- Check Engine Light (MIL) illuminated
- Engine misfires at idle or under load
- Flashing Check Engine Light (severe misfire)
- Engine runs rough when cold
Common Causes
- Failed ignition coil or coil pack
- Damaged spark plug wires or boots
- Low compression in one or more cylinders
- Carbon buildup on intake valves
Diagnosis Steps
- 1Connect an OBD-II scanner and read all stored trouble codes and freeze frame data
- 2Inspect spark plugs for wear, fouling, or damage; replace if necessary
- 3Test ignition coils using a multimeter or ignition coil tester
- 4Check spark plug wires and boots for damage or arcing
- 5Perform a compression test on the affected cylinder(s)
Estimated Repair Cost
$100 — $500
Cost varies by vehicle, location, and repair shop. Includes parts and labor.
Commonly Affected Vehicles
Volkswagen GolfToyota CorollaSubaru ForesterHonda Accord
Related Codes
More Ignition Codes
Frequently Asked Questions
Driving with a misfire is not recommended. A misfiring engine can damage the catalytic converter, reduce fuel economy, and lead to complete engine failure. If the Check Engine Light is flashing, stop driving immediately.