AutoCodes – GMC – P135A GMC

P135A GMC Code - Ignition Coil Supply Voltage Circuit Bank 1

Quick Answer

The ignition system uses an individual ignition coil for each cylinder. Common causes include Blown Ignition Coil Fuse, Ignition Coil Fuse harness is open or shorted, Ignition Coil Fuse 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: P135A GMC indicates Ignition Coil Supply Voltage Circuit Bank 1.
Common causes: Common causes include Blown Ignition Coil Fuse, Ignition Coil Fuse harness is open or shorted, Ignition Coil Fuse 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 5,032

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 13, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P135A GMC Description

The ignition system uses an individual ignition coil for each cylinder. The Engine Control Module (ECM) monitors the ignition voltage from the fuse to the individual coils. The Diagnostic Trouble Code (DTC) will be set if the ECM detects less than 2.5 V on the ignition coil supply voltage circuit.

OBDII Code P135A GMC - Ignition Coil Supply Voltage Circuit Bank 1 - AutoCodes.com — P135A GMC Code - Ignition Coil Supply Voltage Circuit Bank 1

What does this mean?

What are the Possible Causes of the DTC P135A GMC?

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

How to Fix the DTC P135A GMC?

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 P135A GMC 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 P135A GMC code?

Need more information on how to fix the P135A GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P135A GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P135A 2014 GMC Sierra — Ignition Coil Supply Voltage Circuit Bank 1
P135A 2015 GMC Sierra — Ignition Coil Supply Voltage Circuit Bank 1
P135A 2016 GMC Sierra — Ignition Coil Supply Voltage Circuit Bank 1
P135A 2017 GMC Sierra — Ignition Coil Supply Voltage Circuit Bank 1
P135A 2018 GMC Sierra — Ignition Coil Supply Voltage Circuit Bank 1

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.