Audi Code P1377 – Cylinder 8 Ignition Circuit Short to B+

Code P1377 Description Audi

When a vehicle’s onboard computer detects code P1377, it means there is a short circuit in the ignition circuit of cylinder 8 that connects it to the battery positive voltage (B+). This can lead to various issues with the vehicle’s ignition system, affecting its ability to start and run properly. The ignition circuit is responsible for providing the necessary spark to ignite the air-fuel mixture in the combustion chamber. A short circuit can therefore disrupt this process and result in misfires, rough idling, and poor performance.

Common Causes of Audi Code P1377

NOTE: The listed causes may not be a complete list of all potential issues, and there could be other causes.

1. Wiring Problems: Damaged or corroded wiring can cause a short circuit in the ignition circuit of cylinder 8.
2. Faulty Ignition Coil: A defective ignition coil can cause irregular sparks, leading to a short circuit.
3. PCM Failure: An issue with the powertrain control module can disrupt the ignition system and trigger code P1377.
4. Poor Electrical Connections: Loose or corroded electrical connections can cause a short circuit in the ignition circuit.

Symptoms of Audi Code P1377

1. Engine Misfires: A short circuit in the ignition circuit can cause misfires in cylinder 8, which may lead to rough engine operation and potentially damage the catalytic converter.
2. Rough Idling: The engine may idle roughly or stall due to a disrupted ignition process.
3. Reduced Power and Acceleration: The vehicle may struggle to accelerate or feel sluggish due to misfires in cylinder 8.
4. Check Engine Light: The vehicle’s onboard diagnostic system will detect the issue and trigger the check engine light to alert the driver of a problem.

How to Fix Audi Code P1377

1. Diagnose the Problem: Use a diagnostic scanner to retrieve the error code and perform a visual inspection of the ignition system components.
2. Check Wiring and Connections: Inspect the wiring harness for any damage and ensure electrical connections are not corroded or loose.
3. Test the Ignition Coil: Check the functionality of the ignition coil by testing it with a multimeter or a dedicated ignition tester.
4. Replace Faulty Components: Replace any damaged wiring, connectors, or ignition coils if they are found to be the cause of the short circuit.
5. Clear Codes and Perform a Road Test: Clear the error code from the PCM’s memory and conduct a road test of the vehicle to ensure the issue has been resolved.