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Engine-Codes – GMC – P122B 2015 GMC Sierra

P122B 2015 GMC Sierra Code - Intake Air Flow Valve Control Supply Voltage Circuit

Quick Answer

The P122B diagnostic trouble code (DTC) for a 2015 GMC Sierra relates to the Intake Air Flow Valve Control Supply Voltage Circuit. Common causes include Faulty intake air flow valve, Wiring harness issues, Defective control module. 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
P122B 2015 GMC Sierra indicates Intake Air Flow Valve Control Supply Voltage Circuit.
Common causes
Common causes include Faulty intake air flow valve, Wiring harness issues, Defective control module.
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 Sep 17, 2024
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Code P122B 2015 GMC Sierra Description

The P122B diagnostic trouble code (DTC) for a 2015 GMC Sierra relates to the Intake Air Flow Valve Control Supply Voltage Circuit. This code indicates that there is an issue with the supply voltage circuit that controls the intake air flow valve. The intake air flow valve is a crucial component of the vehicle's air intake system, responsible for regulating the amount of air that enters the engine. This, in turn, affects the air-fuel mixture and combustion process, ultimately impacting the vehicle's performance and efficiency.

OBDII Code P122B 2015 GMC Sierra - Intake Air Flow Valve Control Supply Voltage Circuit
P122B 2015 GMC Sierra Code - Intake Air Flow Valve Control Supply Voltage Circuit

Common Causes of P122B 2015 GMC Sierra

  1. Faulty intake air flow valve
  2. Wiring harness issues
  3. Defective control module
  4. Corrosion or poor connections in the circuit
  5. Electrical system malfunctions

Symptoms of P122B 2015 GMC Sierra

  1. Poor acceleration
  2. Reduced power
  3. Rough idling
  4. Stalling
  5. Difficulty starting

How to Fix P122B 2015 GMC Sierra

  1. Begin by conducting a thorough inspection of the intake air flow valve control system, checking for any visible damage or loose connections.
  2. Test the voltage supply to the intake air flow valve using a multimeter to determine if it falls within the specified range.
  3. Replace the intake air flow valve if it is found to be faulty, ensuring that the new component is compatible with the vehicle's make and model.
  4. Repair or replace any damaged wiring harnesses or connectors in the circuit to restore proper voltage supply.
  5. Clear the DTC using an OBD-II scanner and test drive the vehicle to confirm that the issue has been resolved.

Cost to Fix P122B 2015 GMC Sierra

The typical repair costs for addressing a P122B code related to the Intake Air Flow Valve Control Supply Voltage Circuit can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the cost of replacing the intake air flow valve itself can range from $150 to $300, while addressing wiring or electrical system problems may add to the total cost. Labor rates at auto repair shops typically range from $80 to $150 per hour, with additional charges for diagnostic time and any necessary parts. It is advisable to consult with a trusted mechanic or dealership to obtain a more accurate estimate based on your vehicle's make and model, as well as local labor rates.

What does this mean?

Tech Notes for P122B 2015 GMC Sierra









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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 P122B 2015 GMC Sierra Code

1. What does the OBDII code P122B mean on a 2015 GMC Sierra?

P122B indicates an issue with the Intake Air Flow Valve Control Supply Voltage Circuit, which means the engine control module (ECM) has detected a problem with the electrical supply to the intake air flow valve.

2. What are the common symptoms of the P122B code?

Symptoms may include reduced engine performance, poor acceleration, engine hesitation, the check engine light turning on, and possible limp mode activation.

3. What causes the P122B code to appear on a 2015 GMC Sierra?

Common causes include a faulty intake air flow valve, damaged wiring or connectors in the circuit, a blown fuse, or a malfunctioning engine control module (ECM).

4. Can I drive my 2015 GMC Sierra with the P122B code?

Driving with this code may result in reduced performance and could harm the engine over time. It’s best to address the issue as soon as possible.

5. How do I diagnose the P122B code?

Start by inspecting the intake air flow valve wiring and connectors for damage or corrosion. Check the fuse for the circuit, and use a multimeter to test voltage and continuity in the circuit.

6. How do I fix the P122B code on a 2015 GMC Sierra?

Repairs may include replacing a faulty intake air flow valve, repairing or replacing damaged wiring or connectors, or replacing a blown fuse. In rare cases, the ECM may need reprogramming or replacement.

7. How much does it cost to fix the P122B code?

Repair costs can vary depending on the issue. Replacing an intake air flow valve typically costs $150–$400, while wiring repairs or ECM replacements can be more expensive.

8. Can a dirty air filter cause the P122B code?

A dirty air filter alone is unlikely to trigger this specific code, but it can contribute to airflow issues. Ensure the air filter is clean as part of your diagnostic process.

9. Will clearing the P122B code with a scanner fix the problem?

Clearing the code may turn off the check engine light temporarily, but it won’t fix the underlying issue. The code will likely return if the root cause isn’t resolved.

10. Is the P122B code related to other intake system issues?

Yes, it may be associated with other intake system faults, such as a malfunctioning throttle body or mass airflow sensor. It’s important to perform a thorough diagnosis to rule out related problems.

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