AutoCodes – GMC – P0357 2017 GMC Sierra

P0357 2017 GMC Sierra Code - Ignition Coil 7 Control Circuit

Quick Answer

The ignition system on this engine uses ignition coils with integrated power transistors. Common causes include Faulty Ignition Coil 7, Ignition Coil 7 harness is open or shorted, Ignition Coil 7 circuit poor electrical connection. 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 2017 GMC Sierra indicates Ignition Coil 7 Control Circuit.
Common causes: Common causes include Faulty Ignition Coil 7, Ignition Coil 7 harness is open or shorted, Ignition Coil 7 circuit poor electrical connection.
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 Popularity 200

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 25, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0357 2017 GMC Sierra Description

The ignition system on this engine uses ignition coils with integrated power transistors. The Engine Control Module (ECM) controls the spark event for each cylinder through individual ignition coil control circuits. When the ECM commands the ignition control circuit On, electrical current flows through the primary winding of the ignition coil, creating a magnetic field. When a spark event is requested, the ECM commands the ignition control circuit Off, interrupting current flow through the primary winding. The collapsing magnetic field created by the primary winding induces a high voltage in the secondary winding, which is connected to the spark plugs. The Diagnostic Trouble Code (DTC) will be set when the control circuit commanded by the ECM state does not match the actual state.

OBDII Code P0357 2017 GMC Sierra - Ignition Coil 7 Control Circuit - AutoCodes.com — P0357 2017 GMC Sierra Code - Ignition Coil 7 Control Circuit

What does this mean?

What are the Possible Causes of the DTC P0357 2017 GMC Sierra?

Faulty Ignition Coil 7
Ignition Coil 7 harness is open or shorted
Ignition Coil 7 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0357 2017 GMC Sierra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0357 2017 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0357 2017 GMC Sierra code?

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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.

Frequently Asked Questions about P0357 2017 GMC Sierra Code

1. What does the OBDII code P0357 mean on a 2017 GMC Sierra?

P0357 indicates an issue with the Ignition Coil 7 Control Circuit, suggesting a malfunction in the circuit responsible for controlling the ignition coil on cylinder 7.

2. What are the common symptoms of code P0357 in a 2017 GMC Sierra?

Symptoms may include engine misfires, rough idling, reduced power, poor fuel economy, and an illuminated check engine light.

3. What causes the P0357 code in a 2017 GMC Sierra?

Common causes include a faulty ignition coil, damaged wiring or connectors in the control circuit, a defective ignition control module, or a malfunctioning PCM.

4. Can I drive my 2017 GMC Sierra with a P0357 code?

Driving with a P0357 code is not recommended as it can lead to engine misfires, reduced performance, and potential damage to other components like the catalytic converter.

5. How do I diagnose the P0357 code on a 2017 GMC Sierra?

Use a scan tool to confirm the code, visually inspect the ignition coil and wiring for damage, test the ignition coil with a multimeter, and check for proper connection at the coil and PCM.

6. How do I fix the P0357 code on my 2017 GMC Sierra?

Repairs may include replacing the ignition coil for cylinder 7, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the PCM if necessary.

7. How much does it cost to fix a P0357 code on a 2017 GMC Sierra?

The cost can vary, but replacing an ignition coil typically ranges from $50 to $150 for parts and $50 to $100 for labor, depending on your location.

8. Can a bad spark plug cause a P0357 code on a 2017 GMC Sierra?

While a bad spark plug is not the direct cause of P0357, it can contribute to misfires. It's important to check the spark plugs when diagnosing ignition-related issues.

9. Does the P0357 code always mean the ignition coil is bad?

No, the P0357 code could also be caused by wiring issues, a faulty connector, or problems with the PCM or ignition control module.

10. How can I prevent the P0357 code from recurring on my 2017 GMC Sierra?

Regular maintenance, including inspecting and replacing ignition components as needed, ensuring proper wiring connections, and addressing misfires promptly, can help prevent this code from recurring.