AutoCodes – GMC – P135A 2017 GMC Sierra

P135A 2017 GMC Sierra 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 2017 GMC Sierra 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 238

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 2017 GMC Sierra 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 2017 GMC Sierra - Ignition Coil Supply Voltage Circuit Bank 1 - AutoCodes.com — P135A 2017 GMC Sierra Code - Ignition Coil Supply Voltage Circuit Bank 1

What does this mean?

What are the Possible Causes of the DTC P135A 2017 GMC Sierra?

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 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 P135A 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 P135A 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 P135A 2017 GMC Sierra Code

1. What does the OBDII code P135A mean on a 2017 GMC Sierra?

P135A indicates an issue with the ignition coil supply voltage circuit on Bank 1, which affects the proper operation of the ignition system.

2. What are the common symptoms of the P135A code?

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

3. What causes the P135A code on a 2017 GMC Sierra?

Common causes include a faulty ignition coil, damaged wiring or connectors, a blown fuse, or issues with the powertrain control module (PCM).

4. How do I diagnose the P135A code?

Diagnosis involves inspecting the ignition coil wiring and connectors for damage, checking for blown fuses, testing the ignition coil, and using a multimeter to verify voltage supply.

5. Can I drive my 2017 GMC Sierra with the P135A code?

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

6. How do I fix the P135A code?

Repairs may include replacing a faulty ignition coil, repairing or replacing damaged wiring or connectors, replacing a blown fuse, or reprogramming the PCM if necessary.

7. How much does it cost to repair the P135A code?

Repair costs vary depending on the cause but typically range from $100 to $300 for parts and labor, depending on whether the ignition coil or wiring needs to be replaced.

8. Is this code specific to Bank 1?

Yes, P135A specifically refers to the ignition coil voltage circuit on Bank 1, which is the side of the engine containing cylinder 1.

9. Can a bad ignition coil cause the P135A code?

Yes, a defective ignition coil is one of the most common causes of the P135A code.

10. How can I prevent the P135A code from recurring?

Regular maintenance, inspecting ignition components for wear, and promptly addressing wiring or electrical issues can help prevent this code from reappearing.