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Engine-Codes – GMC – P0355 GMC

P0355 GMC Code - Ignition Coil 5 Control Circuit

Quick Answer

The P0355 GMC diagnostic trouble code (DTC) refers to an issue with the ignition coil 5 control circuit. Common causes include Faulty ignition coil, Wiring issues in the control circuit, Poor connection or loose wiring. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0355 GMC indicates Ignition Coil 5 Control Circuit.
Common causes
Common causes include Faulty ignition coil, Wiring issues in the control circuit, Poor connection or loose wiring.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code P0355 GMC Description

The P0355 GMC diagnostic trouble code (DTC) refers to an issue with the ignition coil 5 control circuit. This code indicates a problem with the electrical circuit that controls the ignition coil for cylinder 5 in the engine. The ignition coil is responsible for converting the low voltage from the battery into the high voltage needed to ignite the fuel mixture in the combustion chamber. If there is an issue with the control circuit, it can lead to misfiring, rough idling, poor fuel efficiency, and even engine stalling.

OBDII Code P0355 GMC - Ignition Coil 5 Control Circuit
P0355 GMC Code - Ignition Coil 5 Control Circuit

Common Causes of P0355 GMC

  1. Faulty ignition coil
  2. Wiring issues in the control circuit
  3. Poor connection or loose wiring
  4. Malfunctioning Engine Control Module (ECM)
  5. Corrosion or damage to electrical components

Symptoms of P0355 GMC

  1. Engine misfiring
  2. Rough idling
  3. Decreased fuel efficiency
  4. Engine stalling
  5. Check Engine Light illuminated on the dashboard

How to Fix P0355 GMC

  1. Diagnose the issue by using a scan tool to read the DTC and inspecting the ignition coil, wiring, and connections for any visible damage.
  2. Replace the faulty ignition coil if it is found to be the root cause of the issue.
  3. Repair or replace any damaged wiring or connectors in the control circuit.
  4. Clear the DTC and reset the ECM to see if the issue persists.
  5. Test drive the vehicle to ensure that the problem has been resolved and that the engine is running smoothly.

Cost to Fix P0355 GMC

The cost of repairing the P0355 GMC code can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. Generally, the cost of replacing an ignition coil can range from $100 to $300, including parts and labor. Additional costs may be incurred if there are wiring issues or if the ECM needs to be replaced. It is recommended to get a detailed estimate from a qualified mechanic to get a more accurate cost for the repair.

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Information for Specific GMC Models

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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