P135B 2018 GMC Sierra Code - Ignition Coil Supply Voltage Circuit Bank 2
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
- P135B 2018 GMC Sierra indicates Ignition Coil Supply Voltage Circuit Bank 2.
- 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 P135B 2018 GMC Sierra Description
What are the Possible Causes of the DTC P135B 2018 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 P135B 2018 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 P135B 2018 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 P135B 2018 GMC Sierra Code
1. What does the OBDII code P135B mean on a 2018 GMC Sierra?
P135B indicates an issue in the ignition coil supply voltage circuit for Bank 2, which affects the proper functioning of the ignition system.
2. What are the common symptoms of code P135B in a 2018 GMC Sierra?
Common symptoms include engine misfires, rough idling, reduced engine performance, hesitation during acceleration, and the Check Engine Light turning on.
3. What causes the P135B code to appear?
The most common causes include a faulty ignition coil, damaged wiring or connectors in the ignition coil circuit, a failing Powertrain Control Module (PCM), or voltage supply issues.
4. How can I diagnose the P135B code on my 2018 GMC Sierra?
Start by inspecting the ignition coil for Bank 2, checking for damaged wiring or loose connections, and testing the voltage supply to the coil. A scan tool can also help monitor live data and pinpoint the issue.
5. Can I drive my 2018 GMC Sierra with the P135B code active?
It's not recommended to drive with this code active, as it can cause engine misfires, reduced performance, and potential damage to other engine components over time.
6. How do I fix the P135B code on a 2018 GMC Sierra?
Repairs may include replacing the faulty ignition coil, repairing or replacing damaged wiring, cleaning or securing electrical connectors, and, in rare cases, reprogramming or replacing the PCM.
7. How do I identify which ignition coil is on Bank 2 for the P135B code?
Bank 2 refers to the side of the engine opposite Bank 1, which typically contains cylinder 1. Consult your vehicle’s service manual or cylinder layout diagram for precise identification.
8. Can a weak battery cause the P135B code to appear?
Yes, a weak or failing battery can cause voltage supply issues, potentially triggering the P135B code.
9. What tools are needed to troubleshoot the P135B code on a 2018 GMC Sierra?
You’ll need an OBDII scan tool, a multimeter for voltage testing, and possibly a wiring diagram for the ignition coil circuit.
10. Is a P135B code specific to GM vehicles like the 2018 GMC Sierra?
Yes, the P135B code is manufacturer-specific to GM vehicles and relates to the ignition coil supply voltage circuit on Bank 2.
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