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Engine-Codes – GMC – P135A 2014 GMC Sierra

P135A 2014 GMC Sierra Code - Ignition Coil Supply Voltage Circuit Bank 1

Quick Answer

The diagnostic trouble code P135A in a 2014 GMC Sierra indicates a problem with the ignition coil supply voltage circuit in bank 1. Common causes include Faulty ignition coil, Damaged wiring or connectors in the ignition coil circuit, Malfunctioning ignition control module. 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
P135A 2014 GMC Sierra indicates Ignition Coil Supply Voltage Circuit Bank 1.
Common causes
Common causes include Faulty ignition coil, Damaged wiring or connectors in the ignition coil circuit, Malfunctioning ignition control module.
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 16, 2024
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Code P135A 2014 GMC Sierra Description

The diagnostic trouble code P135A in a 2014 GMC Sierra indicates a problem with the ignition coil supply voltage circuit in bank 1. The ignition coil is a crucial component in the ignition system of a vehicle, responsible for converting the low voltage from the battery into the high voltage needed to ignite the air-fuel mixture in the engine cylinders. In this case, the code specifically points to an issue with the supply voltage to the ignition coil in bank 1, which can lead to misfires, poor engine performance, and potential long-term damage if not addressed promptly.

OBDII Code P135A 2014 GMC Sierra - Ignition Coil Supply Voltage Circuit Bank 1
P135A 2014 GMC Sierra Code - Ignition Coil Supply Voltage Circuit Bank 1

Common Causes of P135A 2014 GMC Sierra

  1. Faulty ignition coil
  2. Damaged wiring or connectors in the ignition coil circuit
  3. Malfunctioning ignition control module
  4. Issues with the power supply to the ignition system

Symptoms of P135A 2014 GMC Sierra

  1. Erratic engine operation
  2. Rough idling
  3. Hesitation during acceleration
  4. Decreased fuel efficiency
  5. Stalling or difficulty starting

How to Fix P135A 2014 GMC Sierra

  1. Begin by conducting a comprehensive diagnostic scan to confirm the P135A code and identify the specific cause of the issue.
  2. Inspect the ignition coil, wiring, and connectors for any signs of damage or wear. Replace any components that are faulty or worn out.
  3. Test the ignition control module to ensure it is functioning correctly. Replace it if necessary.
  4. Check the power supply to the ignition system, including the battery, alternator, and related components, to ensure proper voltage levels.
  5. Clear the diagnostic trouble code, reset the vehicle's computer, and test drive the vehicle to verify that the issue has been resolved.

Cost to Fix P135A 2014 GMC Sierra

The typical repair costs for addressing the P135A code in a 2014 GMC Sierra can vary depending on the specific cause of the issue and the extent of the repairs needed. On average, the cost of parts for replacing an ignition coil or ignition control module can range from $50 to $200, while labor costs can range from $100 to $300. Overall, the total repair cost for this issue may fall between $150 and $500. However, it is important to note that these estimates are general guidelines, and actual costs may vary based on factors such as location, vehicle make and model, and the rates charged by individual auto repair shops. It is recommended to obtain quotes from local shops to get a more accurate estimate for the repair.

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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 P135A 2014 GMC Sierra Code

1. What does the OBDII code P135A mean on a 2014 GMC Sierra?

P135A indicates an issue with the ignition coil supply voltage circuit on Bank 1, which suggests a problem with the electrical power supply to the ignition coil(s) on that side of the engine.

2. What are the common symptoms of code P135A on a 2014 GMC Sierra?

Symptoms may include rough idling, misfires, reduced engine performance, difficulty starting, and the Check Engine Light being illuminated.

3. What causes the P135A code in a 2014 GMC Sierra?

Common causes include a faulty ignition coil, damaged wiring or connectors in the ignition coil circuit, a failed powertrain control module (PCM), or issues with the ignition coil supply voltage.

4. How do I diagnose the P135A code on my 2014 GMC Sierra?

Start by inspecting the ignition coil wiring and connectors for damage or corrosion. Use a multimeter to check for proper voltage supply to the ignition coil(s) and scan for related codes that could indicate other issues.

5. Can I drive my 2014 GMC Sierra with the P135A code?

Driving with this code is not recommended as it can lead to engine misfires, reduced fuel efficiency, and potential damage to the catalytic converter over time.

6. How do I fix the P135A code on a 2014 GMC Sierra?

Repairs may include replacing a faulty ignition coil, repairing or replacing damaged wiring or connectors, and in some cases, reprogramming or replacing the PCM if it is determined to be faulty.

7. How much does it cost to repair the P135A code on a 2014 GMC Sierra?

The repair cost can vary depending on the root cause. Replacing an ignition coil typically costs $100–$300, while wiring repairs or PCM replacement could cost significantly more.

8. Can a bad battery cause the P135A code on a 2014 GMC Sierra?

Yes, if the battery is weak or has poor connections, it can lead to insufficient voltage reaching the ignition coil, triggering this code.

9. Does the P135A code affect all ignition coils on Bank 1?

Not necessarily. The code points to the ignition coil supply voltage circuit on Bank 1, but further diagnosis is needed to determine if one or all coils on Bank 1 are affected.

10. Will clearing the P135A code solve the issue on a 2014 GMC Sierra?

Clearing the code may temporarily turn off the Check Engine Light, but if the underlying issue is not resolved, the code will likely return. Proper diagnosis and repair are necessary.

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