P0357 GMC Code - Ignition Coil 7 Control Circuit
Quick Answer
The P0357 GMC code indicates a problem with the ignition coil 7 control circuit in the vehicle's engine. Common causes include Faulty ignition coil 7, Wiring issues in the ignition coil 7 control circuit, Engine control module (ECM) malfunction. 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
- P0357 GMC indicates Ignition Coil 7 Control Circuit.
- Common causes
- Common causes include Faulty ignition coil 7, Wiring issues in the ignition coil 7 control circuit, Engine control module (ECM) malfunction.
- 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 P0357 GMC Description
The P0357 GMC code indicates a problem with the ignition coil 7 control circuit in the vehicle's engine. The ignition coil is an important component responsible for converting the low voltage from the battery into the high voltage needed to ignite the fuel-air mixture in the engine's cylinders. Ignition coil 7 is specifically related to the seventh cylinder in the engine.
Common Causes of P0357 GMC
- Faulty ignition coil 7
- Wiring issues in the ignition coil 7 control circuit
- Engine control module (ECM) malfunction
- Electrical problems such as a short circuit
- Corrosion or loose connections in the wiring
Symptoms of P0357 GMC
- Engine misfires
- Rough idling
- Decreased fuel efficiency
- Engine hesitation
- Illumination of the check engine light
How to Fix P0357 GMC
- Diagnose the issue using a scan tool to confirm the P0357 code and identify the specific problem with ignition coil 7.
- Inspect the wiring for any damage, corrosion, or loose connections. Repair or replace any faulty wiring.
- Test the ignition coil 7 for proper function. Replace the ignition coil if it is found to be faulty.
- Check the engine control module (ECM) for any malfunctions. Replace the ECM if necessary.
- Clear the diagnostic trouble codes and test drive the vehicle to ensure that the issue has been resolved.
Cost to Fix P0357 GMC
The typical repair costs for addressing the P0357 code can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. On average, the cost of replacing an ignition coil can range from $150 to $300, while the cost of replacing the engine control module (ECM) can range from $500 to $1000. Including parts and labor, the total repair cost for this issue could range from $200 to $1500. It's important to note that diagnosis time and labor rates can vary, so it's recommended to obtain quotes from local auto repair shops for a more accurate estimate.
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Information for Specific GMC Models
- P0357 2014 GMC Sierra — Ignition Coil 7 Control Circuit
- P0357 2015 GMC Sierra — Ignition Coil 7 Control Circuit
- P0357 2016 GMC Sierra — Ignition Coil 7 Control Circuit
- P0357 2017 GMC Sierra — Ignition Coil 7 Control Circuit
- P0357 2018 GMC Sierra — Ignition Coil 7 Control Circuit
Frequently Asked Questions about P0357 GMC Code
1. What does the OBDII code P0357 mean on a GMC?
P0357 indicates a malfunction in the ignition coil "7" control circuit, which can affect engine performance.
2. What are the symptoms of a P0357 code on a GMC?
Symptoms may include engine misfires, rough idle, reduced power, poor fuel economy, and the Check Engine Light turning on.
3. What causes the P0357 code on a GMC vehicle?
Common causes include a faulty ignition coil, damaged wiring or connectors in the coil circuit, or a malfunctioning PCM (Powertrain Control Module).
4. How do I diagnose the P0357 code on my GMC?
Start by inspecting the ignition coil and its wiring for damage or corrosion. Use a multimeter to check for proper voltage and continuity in the circuit. Scan the PCM for additional codes.
5. Can I drive my GMC with a P0357 code?
Driving with this code is not recommended, as it can lead to increased engine misfires, reduced performance, and potential damage to the catalytic converter.
6. How do I fix the P0357 code on a GMC?
Repairs may include replacing the ignition coil for cylinder 7, repairing or replacing damaged wiring or connectors, or in rare cases, replacing the PCM.
7. How much does it cost to fix a P0357 code on a GMC?
Depending on the issue, repairs can range from $50-$300 for parts and labor, with ignition coils being the most common component replaced.
8. Where is ignition coil 7 located on a GMC?
The location of ignition coil 7 depends on the engine layout, but it will correspond to cylinder 7 in the firing order, which is typically on the driver's side near the rear of a V8 engine.
9. Can a bad spark plug cause the P0357 code on a GMC?
While the code specifically refers to the ignition coil circuit, a bad spark plug can cause similar symptoms and should be inspected as part of the diagnostic process.
10. Will clearing the P0357 code fix the issue on my GMC?
Clearing the code will turn off the Check Engine Light temporarily, but if the underlying issue isn’t resolved, the code will likely return.
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