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Engine-Codes – GMC – P135A GMC

P135A GMC Code - Ignition Coil Supply Voltage Circuit Bank 1

Quick Answer

The P135A GMC diagnostic code indicates a problem with the ignition coil supply voltage circuit in bank 1 of the vehicle. Common causes include Damaged wiring or connectors: Corrosion, fraying, or damage to the wiring or connectors in the ignition coil supply voltage circuit can disrupt the flow of power to the ignition coil, Faulty ignition coil: A malfunctioning ignition coil can fail to generate the necessary voltage to produce a spark in the spark plugs, leading to misfires and other performance issues, Malfunctioning ignition control module: The ignition control module regulates the operation of the ignition coil. 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 GMC indicates Ignition Coil Supply Voltage Circuit Bank 1.
Common causes
Common causes include Damaged wiring or connectors: Corrosion, fraying, or damage to the wiring or connectors in the ignition coil supply voltage circuit can disrupt the flow of power to the ignition coil, Faulty ignition coil: A malfunctioning ignition coil can fail to generate the necessary voltage to produce a spark in the spark plugs, leading to misfires and other performance issues, Malfunctioning ignition control module: The ignition control module regulates the operation of the ignition coil.
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 07, 2024
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Code P135A GMC Description

The P135A GMC diagnostic code indicates a problem with the ignition coil supply voltage circuit in bank 1 of the vehicle. The ignition coil is a crucial component in the ignition system that converts the low voltage from the battery into the high voltage needed to create a spark in the spark plugs. The ignition coil supply voltage circuit is responsible for providing the necessary power to the ignition coil to generate this spark.

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

Common Causes of P135A GMC

  1. Damaged wiring or connectors: Corrosion, fraying, or damage to the wiring or connectors in the ignition coil supply voltage circuit can disrupt the flow of power to the ignition coil.
  2. Faulty ignition coil: A malfunctioning ignition coil can fail to generate the necessary voltage to produce a spark in the spark plugs, leading to misfires and other performance issues.
  3. Malfunctioning ignition control module: The ignition control module regulates the operation of the ignition coil. A fault in this component can affect the ignition coil's performance.
  4. Problem with the engine control module (ECM): The ECM controls various functions in the vehicle, including the ignition system. If the ECM is faulty, it may not provide the correct signals to the ignition coil.

Symptoms of P135A GMC

  1. Engine misfires: The most common symptom associated with this code is engine misfires, which can cause rough idling, shaking, and a noticeable decrease in engine performance.
  2. Difficulty starting the engine: A faulty ignition coil supply voltage circuit can lead to difficulties starting the engine, as the spark plugs may not receive the necessary spark to ignite the air-fuel mixture.
  3. Decreased fuel efficiency: A malfunctioning ignition coil can result in incomplete combustion, leading to decreased fuel efficiency and increased fuel consumption.
  4. Illuminated check engine light: The P135A code will trigger the check engine light on the vehicle's dashboard, indicating a problem with the ignition coil supply voltage circuit.

How to Fix P135A GMC

  1. Diagnose the issue: Use a diagnostic scanner to retrieve the P135A code and perform further testing to pinpoint the exact cause of the problem, such as checking the wiring, connectors, ignition coil, ignition control module, and ECM.
  2. Replace faulty components: Depending on the diagnosis, replace any damaged wiring, connectors, ignition coil, ignition control module, or ECM that are causing the issue.
  3. Clear the code: After the repairs are completed, clear the diagnostic trouble code from the vehicle's ECM using a diagnostic scanner.
  4. Test the vehicle: Start the engine and test the vehicle to ensure that the issue has been resolved and that the symptoms associated with the P135A code have been eliminated.
  5. Perform a road test: Take the vehicle for a road test to verify that the repairs have been successful and that the engine is running smoothly without any misfires or performance issues.

Cost to Fix P135A GMC

The cost of repairing the ignition coil supply voltage circuit in bank 1 can vary depending on the specific cause of the issue and the cost of parts and labor. In general, the repair costs for this code can range from $150 to $500, including parts and labor. However, it's important to note that the actual cost may be higher or lower based on factors such as the vehicle make and model, the location of the repair shop, and the extent of the repairs needed. Diagnostic time and labor rates at auto repair shops typically range from $80 to $150 per hour, with rates potentially higher at dealerships or metropolitan areas and lower at independent shops. It is recommended to obtain a detailed estimate from a trusted auto repair shop to determine the exact cost of repairing the P135A code.

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Information for Specific GMC Models

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 GMC Code

1. What are common symptoms of OBDII code P135A GMC related to the Ignition Coil Supply Voltage Circuit Bank 1?

- Common symptoms include rough engine idling, engine misfires, loss of power, and the Check Engine light illuminating.

2. What are the possible causes of OBDII code P135A GMC indicating an issue with the Ignition Coil Supply Voltage Circuit Bank 1?

- The possible causes include a faulty ignition coil, damaged wiring or connectors in the ignition coil circuit, a blown fuse, or a problem with the PCM (Powertrain Control Module).

3. How can I diagnose the issue causing OBDII code P135A GMC for the Ignition Coil Supply Voltage Circuit Bank 1?

- Diagnosis involves checking the ignition coil for proper operation, inspecting the wiring and connectors for any damage, testing the voltage supply to the ignition coil, and scanning the PCM for any related trouble codes.

4. Can a DIY enthusiast repair OBDII code P135A GMC associated with the Ignition Coil Supply Voltage Circuit Bank 1?

- DIY repair is possible if you have the necessary tools and expertise. It typically involves replacing a faulty ignition coil, repairing damaged wiring or connectors, or resetting the PCM.

5. Is it safe to continue driving with OBDII code P135A GMC triggered by the Ignition Coil Supply Voltage Circuit Bank 1 issue?

- It is not recommended to drive the vehicle with this issue as it can lead to further damage to the engine and components. Prompt diagnosis and repair are advisable.

6. How do I reset the Check Engine light after resolving OBDII code P135A GMC for the Ignition Coil Supply Voltage Circuit Bank 1?

- The Check Engine light can be reset using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes. However, it's essential to ensure the underlying issue is fixed first.

7. What role does the ignition coil play in the Ignition Coil Supply Voltage Circuit Bank 1, triggering OBDII code P135A GMC?

- The ignition coil is responsible for converting the low voltage from the battery into a high voltage needed to create the spark that ignites the fuel-air mixture in the engine cylinders. A faulty ignition coil can lead to code P135A.

8. How can I prevent issues related to OBDII code P135A GMC for the Ignition Coil Supply Voltage Circuit Bank 1?

- Regular maintenance, such as inspecting and replacing ignition components as needed, keeping the electrical system in good condition, and addressing engine performance issues promptly, can help prevent this code from occurring.

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