P135A 2014 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 2014 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.
Code P135A 2014 GMC Sierra Description
What are the Possible Causes of the DTC P135A 2014 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 2014 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 2014 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.
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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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