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Engine-Codes – GMC – P0358 2018 GMC Sierra

P0358 2018 GMC Sierra Code - Ignition Coil 8 Control Circuit

Quick Answer

The P0358 diagnostic trouble code (DTC) indicates a malfunction in the ignition coil control circuit for cylinder 8 in a 2018 GMC Sierra. Common causes include Faulty ignition coil for cylinder 8, Damaged or corroded wiring in the ignition coil control circuit, Poor electrical connections at the ignition coil or ECM. 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
P0358 2018 GMC Sierra indicates Ignition Coil 8 Control Circuit.
Common causes
Common causes include Faulty ignition coil for cylinder 8, Damaged or corroded wiring in the ignition coil control circuit, Poor electrical connections at the ignition coil or ECM.
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 Oct 21, 2024
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Code P0358 2018 GMC Sierra Description

The P0358 diagnostic trouble code (DTC) indicates a malfunction in the ignition coil control circuit for cylinder 8 in a 2018 GMC Sierra. This code is part of the OBD-II system, which monitors the performance of various engine components to ensure optimal operation. The ignition coil is responsible for converting the battery's low voltage into the high voltage needed to create a spark at the spark plug, igniting the air-fuel mixture in the combustion chamber. When the control circuit for the ignition coil fails, it can lead to misfires, reduced engine performance, and increased emissions.

OBDII Code P0358 2018 GMC Sierra - Ignition Coil 8 Control Circuit
P0358 2018 GMC Sierra Code - Ignition Coil 8 Control Circuit

Common Causes of P0358 2018 GMC Sierra

  1. Faulty ignition coil for cylinder 8.
  2. Damaged or corroded wiring in the ignition coil control circuit.
  3. Poor electrical connections at the ignition coil or ECM.
  4. Malfunctioning engine control module (ECM).
  5. Faulty spark plug or other ignition system components.

Symptoms of P0358 2018 GMC Sierra

  1. Engine misfires, particularly in cylinder 8, leading to rough idling or stalling.
  2. Decreased engine power and acceleration.
  3. Poor fuel economy due to inefficient combustion.
  4. Illuminated check engine light on the dashboard.
  5. Difficulty starting the engine or prolonged cranking time.

How to Fix P0358 2018 GMC Sierra

  1. Visual Inspection: Begin with a thorough visual inspection of the ignition coil, wiring, and connectors for signs of damage, corrosion, or loose connections.
  2. Test the Ignition Coil: Use a multimeter to check the resistance of the ignition coil. If it falls outside the manufacturer's specifications, replace the ignition coil.
  3. Check Wiring and Connectors: Inspect the wiring harness for shorts, breaks, or corrosion. Repair or replace any damaged wiring or connectors.
  4. Scan for Additional Codes: Use an OBD-II scanner to check for any additional trouble codes that may indicate other issues within the ignition system.
  5. ECM Testing: If the ignition coil and wiring are in good condition, test the ECM to ensure it is sending the correct signals to the ignition coil.

Cost to Fix P0358 2018 GMC Sierra

The typical repair costs for addressing a P0358 code can range from $150 to $600, depending on the specific issue identified. This estimate includes parts such as a new ignition coil (which can cost between $50 to $150) and labor costs. Labor rates vary widely based on location, vehicle make and model, and engine type. Most auto repair shops charge between $80 and $150 per hour; however, rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less. It's advisable to check local rates for a more precise estimate. Additionally, if further diagnostics are needed, this may increase the overall cost.

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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.

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