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Engine-Codes – GMC – P135B 2017 GMC Sierra

P135B 2017 GMC Sierra Code - Ignition Coil Supply Voltage Circuit Bank 2

Quick Answer

The P135B code indicates a problem with the ignition coil supply voltage circuit for Bank 2 in a 2017 GMC Sierra. Common causes include Faulty ignition coil in Bank 2, Damaged or corroded wiring or connectors in the ignition coil circuit, Issues with the Engine Control Module (ECM) or its software. 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 2017 GMC Sierra indicates Ignition Coil Supply Voltage Circuit Bank 2.
Common causes
Common causes include Faulty ignition coil in Bank 2, Damaged or corroded wiring or connectors in the ignition coil circuit, Issues with the Engine Control Module (ECM) or its software.
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 Oct 24, 2024
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Code P135B 2017 GMC Sierra Description

The P135B code indicates a problem with the ignition coil supply voltage circuit for Bank 2 in a 2017 GMC Sierra. This code is part of the vehicle's onboard diagnostics (OBD-II) system, which monitors various engine parameters to ensure optimal performance and emissions control. When the Engine Control Module (ECM) detects that the voltage supplied to the ignition coils in Bank 2 is outside the expected range, it triggers this code.

OBDII Code P135B 2017 GMC Sierra - Ignition Coil Supply Voltage Circuit Bank 2
P135B 2017 GMC Sierra Code - Ignition Coil Supply Voltage Circuit Bank 2

Common Causes of P135B 2017 GMC Sierra

  1. Faulty ignition coil in Bank 2.
  2. Damaged or corroded wiring or connectors in the ignition coil circuit.
  3. Issues with the Engine Control Module (ECM) or its software.
  4. Low battery voltage or charging system problems.
  5. Poor ground connections affecting the ignition system.

Symptoms of P135B 2017 GMC Sierra

  1. Engine misfires or rough idling.
  2. Difficulty starting the engine or prolonged cranking time.
  3. Decreased engine power or acceleration.
  4. Increased fuel consumption.
  5. Check Engine Light illuminated on the dashboard.

How to Fix P135B 2017 GMC Sierra

  1. Diagnostic Testing: Begin with a thorough diagnostic scan to confirm the P135B code and check for any related codes that may provide additional context.
  2. Visual Inspection: Inspect the ignition coil, wiring, and connectors for signs of damage, corrosion, or loose connections. Repair or replace any faulty components.
  3. Voltage Testing: Use a multimeter to measure the voltage at the ignition coil connector to ensure it is within the manufacturer's specifications. If the voltage is low, trace the circuit back to identify the source of the problem.
  4. Replace Ignition Coil: If the ignition coil is found to be faulty, replace it with a new, OEM-quality part to ensure reliability.
  5. Clear Codes and Test Drive: After repairs, clear the diagnostic trouble codes and take the vehicle for a test drive to ensure that the issue has been resolved and that no new codes appear.

Cost to Fix P135B 2017 GMC Sierra

The cost to repair the P135B code can vary widely based on the specific issue and the labor rates in your area. On average, you can expect to pay between $150 and $500 for parts and labor. This estimate includes the cost of a new ignition coil (which can range from $50 to $150) and labor costs, which typically range from $80 to $150 per hour. Keep in mind that labor rates can be higher at dealerships or in metropolitan areas, while independent shops may offer lower rates. It's advisable to obtain quotes from local repair shops to get a more accurate estimate tailored to your specific situation.

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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 P135B 2017 GMC Sierra Code

1. What does the OBDII code P135B mean on a 2017 GMC Sierra?

P135B refers to an issue with the ignition coil supply voltage circuit on Bank 2, indicating a problem with the electrical supply to one or more ignition coils on that side of the engine.

2. What are the common symptoms of code P135B in a 2017 GMC Sierra?

Common symptoms include engine misfires, rough idling, poor acceleration, reduced fuel efficiency, and possibly an illuminated check engine light.

3. What causes the P135B code to appear on a 2017 GMC Sierra?

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 a blown fuse related to the ignition system.

4. How can I diagnose code P135B on my 2017 GMC Sierra?

Start by visually inspecting the ignition coil wiring and connectors on Bank 2 for damage or loose connections, test the ignition coils for proper functionality, and check for blown fuses or voltage discrepancies in the circuit.

5. Can I drive my 2017 GMC Sierra with the P135B code active?

Driving with this code is not recommended, as it can cause engine misfires, reduce performance, and potentially lead to further engine damage if left unresolved.

6. How is code P135B typically repaired in a 2017 GMC Sierra?

Repairs usually involve replacing the faulty ignition coil, repairing damaged wiring or connectors, replacing a blown fuse, or, in rare cases, reprogramming or replacing the PCM.

7. How much does it cost to fix the P135B code on a 2017 GMC Sierra?

Repair costs vary depending on the issue, but ignition coil replacement typically ranges from $100 to $300, while wiring repairs or PCM replacement can be more expensive.

8. What tools are needed to fix the P135B code on a 2017 GMC Sierra?

Common tools include a digital multimeter for testing voltage, an OBDII scanner for clearing the code and verifying repairs, and basic hand tools for replacing ignition coils or repairing wiring.

9. Is the P135B code specific to GMC vehicles?

No, while the code is commonly associated with GMC and other General Motors vehicles, it can appear on other makes and models with similar ignition system designs.

10. Can a weak battery cause the P135B code on a 2017 GMC Sierra?

Yes, a weak or failing battery may lead to insufficient voltage supply to ignition components, potentially triggering the P135B code.

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