P0355 2018 GMC Sierra Code - Ignition Coil 5 Control Circuit
Quick Answer
The diagnostic trouble code P0355 for a 2018 GMC Sierra indicates a problem with the Ignition Coil 5 Control Circuit. Common causes include Faulty ignition coil, Wiring harness issues, Poor electrical connections. 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 2018 GMC Sierra indicates Ignition Coil 5 Control Circuit.
- Common causes
- Common causes include Faulty ignition coil, Wiring harness issues, Poor electrical connections.
- 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.
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Code P0355 2018 GMC Sierra Description
The diagnostic trouble code P0355 for a 2018 GMC Sierra indicates a problem with the Ignition Coil 5 Control Circuit. This code specifically points to an issue 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 create a spark in the spark plug, which ignites the air-fuel mixture in the combustion chamber.
Common Causes of P0355 2018 GMC Sierra
- Faulty ignition coil
- Wiring harness issues
- Poor electrical connections
- Powertrain Control Module (PCM) failure
- Corrosion or damage to electrical components
Symptoms of P0355 2018 GMC Sierra
- Check Engine Light illuminated
- Rough idling or engine vibrations
- Decreased fuel efficiency
- Engine misfires
- Engine stalling
How to Fix P0355 2018 GMC Sierra
- Diagnose the specific cause of the issue using a scan tool to pinpoint the problem with the Ignition Coil 5 Control Circuit.
- Inspect the wiring harness and electrical connections for any damage or corrosion. Repair or replace as needed.
- Test the ignition coil for cylinder 5 to determine if it is faulty. Replace if necessary.
- Check the PCM for any faults or errors and reprogram if needed.
- Clear the trouble code from the vehicle's computer and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P0355 2018 GMC Sierra
The typical repair costs for addressing the Ignition Coil 5 Control Circuit issue can range from $150 to $400, depending on the specific cause of the problem and the cost of parts and labor. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate. Additionally, rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more affordable prices.
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