P1381
Misfire Detected — No Communication with BCM (GM)
Moderateignition
Overview
The P1381 code means the PCM has detected a misfire detected — no communication with bcm (gm) 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
- Rough idle or vibrations
- Engine stalling or difficulty starting
- Engine runs rough when cold
- Increased fuel consumption
Common Causes
- Faulty crankshaft or camshaft position sensor
- Faulty ignition control module
- Damaged spark plug wires or boots
- 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 GolfSubaru ForesterChevrolet EquinoxToyota Corolla
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.