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Engine-Codes – GMC – P135B 2016 GMC Sierra

P135B 2016 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 of the engine in a 2016 GMC Sierra. Common causes include Faulty Ignition Coil: A defective ignition coil can fail to provide the necessary voltage for proper ignition, Wiring Issues: Damaged or corroded wiring in the ignition coil circuit can disrupt voltage supply, ECM Malfunction: A faulty Engine Control Module may incorrectly read or supply voltage to the ignition coil. 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 2016 GMC Sierra indicates Ignition Coil Supply Voltage Circuit Bank 2.
Common causes
Common causes include Faulty Ignition Coil: A defective ignition coil can fail to provide the necessary voltage for proper ignition, Wiring Issues: Damaged or corroded wiring in the ignition coil circuit can disrupt voltage supply, ECM Malfunction: A faulty Engine Control Module may incorrectly read or supply voltage to the ignition coil.
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 17, 2024
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Code P135B 2016 GMC Sierra Description

The P135B code indicates a problem with the ignition coil supply voltage circuit for Bank 2 of the engine in a 2016 GMC Sierra. This code is part of the On-Board Diagnostics II (OBD-II) system, which monitors various engine parameters to ensure optimal performance and emissions control. The ignition coil is crucial for the ignition system, as it transforms the battery's low voltage into the high voltage needed to create a spark in the engine's cylinders. Bank 2 refers to the side of the engine that houses cylinders 2, 4, 6, and possibly 8, depending on the engine configuration.

OBDII Code P135B 2016 GMC Sierra - Ignition Coil Supply Voltage Circuit Bank 2
P135B 2016 GMC Sierra Code - Ignition Coil Supply Voltage Circuit Bank 2

Common Causes of P135B 2016 GMC Sierra

  1. Faulty Ignition Coil: A defective ignition coil can fail to provide the necessary voltage for proper ignition.
  2. Wiring Issues: Damaged or corroded wiring in the ignition coil circuit can disrupt voltage supply.
  3. ECM Malfunction: A faulty Engine Control Module may incorrectly read or supply voltage to the ignition coil.
  4. Poor Ground Connection: Insufficient grounding can lead to voltage fluctuations and erratic coil performance.
  5. Sensor Failures: Malfunctioning sensors, such as the crankshaft or camshaft position sensors, can affect ignition timing and voltage delivery.

Symptoms of P135B 2016 GMC Sierra

  1. Engine Misfires: Inconsistent firing of the engine cylinders, leading to rough running conditions.
  2. Reduced Engine Power: Noticeable decrease in acceleration and overall engine responsiveness.
  3. Check Engine Light: The illumination of the check engine light on the dashboard, indicating a fault in the ignition system.
  4. Difficulty Starting: The engine may struggle to start or may not start at all due to insufficient spark.
  5. Increased Emissions: Higher emissions levels due to incomplete combustion, potentially leading to failed emissions tests.

How to Fix P135B 2016 GMC Sierra

  1. Diagnostic Scan: 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.
  3. Test Ignition Coil: Use a multimeter to test the ignition coil's resistance and ensure it operates within manufacturer specifications.
  4. Repair or Replace Components: Depending on the findings, repair any damaged wiring or connectors, and replace the faulty ignition coil as needed.
  5. Clear Codes and Test Drive: After repairs, clear the diagnostic codes and perform a test drive to ensure the issue is resolved and the check engine light does not reappear.

Cost to Fix P135B 2016 GMC Sierra

The repair costs for addressing a P135B code can vary widely based on the specific issue identified during diagnostics. On average, the cost for parts and labor can range from $150 to $600. This estimate includes the price of a new ignition coil (typically $50 to $150) and labor costs, which can vary significantly. Most auto repair shops charge between $80 and $150 per hour, depending on location, vehicle make and model, and engine type. In metropolitan areas or at dealerships, labor rates may be higher, while independent shops often offer more competitive pricing. It is advisable to check local rates for a more precise estimate and to obtain multiple quotes for the best value.

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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 2016 GMC Sierra Code

1. What does the OBD-II code P135B mean on a 2016 GMC Sierra?

P135B indicates an issue with the Ignition Coil Supply Voltage Circuit on Bank 2, which may affect how the engine fires on that side.

2. What are the common symptoms of code P135B in a 2016 GMC Sierra?

Symptoms include engine misfires, rough idling, reduced performance, poor fuel economy, and possibly the check engine light illuminating.

3. What causes the P135B code to appear on a 2016 GMC Sierra?

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

4. How do I diagnose the P135B code on my 2016 GMC Sierra?

Start by checking for damaged or disconnected wiring in the ignition coil circuit for Bank 2, inspect the ignition coils, and test for proper voltage and continuity in the circuit.

5. Can I drive my 2016 GMC Sierra with the P135B code?

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

6. How do I fix the P135B code on my 2016 GMC Sierra?

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

7. What tools are needed to troubleshoot the P135B code?

You’ll need an OBD-II scanner, a multimeter for electrical testing, and potentially a wiring diagram for the ignition system.

8. Does the P135B code specifically refer to a single ignition coil?

No, it refers to the supply voltage circuit for all ignition coils on Bank 2, so you’ll need to inspect all coils on that side of the engine.

9. How much does it typically cost to fix the P135B code on a 2016 GMC Sierra?

The cost varies depending on the issue, but ignition coil replacement can range from $100 to $300 per coil, while wiring repairs may cost $50 to $200.

10. Can a bad PCM cause the P135B code in a 2016 GMC Sierra?

Yes, though it’s less common, a malfunctioning PCM or outdated software could cause improper voltage signals to the ignition coil circuit.

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