P122B 2014 GMC Sierra Code - Intake Air Flow Valve Control Supply Voltage Circuit
Quick Answer
The intake airflow valve of diesel engines reduces the intake air flow rate in part-load operation so that a higher exhaust gas recirculation rate can be achieved. Common causes include Faulty Throttle Body Assembly, Throttle Body Assembly harness is open or shorted, Throttle Body Assembly 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
- P122B 2014 GMC Sierra indicates Intake Air Flow Valve Control Supply Voltage Circuit.
- Common causes
- Common causes include Faulty Throttle Body Assembly, Throttle Body Assembly harness is open or shorted, Throttle Body Assembly 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 P122B 2014 GMC Sierra Description
The Intake airflow valve assembly contains a contactless inductive throttle position sensing element that is managed by a customized integrated circuit. The valve position sensor is mounted within the valve body assembly and is not serviceable. The Engine Control Module (ECM) supplies the valve body with a 5 V reference circuit, a low reference circuit, an H-bridge motor directional control circuit, and an asynchronous signal/serial data circuit. The asynchronous signal means communication is only going from the intake airflow valve to the ECM. The Intake Air Flow Valve cannot receive data from the ECM over the signal/serial data circuit. The valve position sensor provides a signal voltage that changes relative to the valve blade angle. The valve position sensor information is transmitted between the Intake Air Flow Valve and the ECM on the signal/serial data circuit.
The valve may also be used to shut down the engine by closing the intake airflow valve and disabling the fuel injectors if the control module detects the engine speed is beyond the desired control limits. The Diagnostic Trouble Code (DTC) will be set if the ECM detects an open circuit on the intake airflow valve control circuit.
What are the Possible Causes of the DTC P122B 2014 GMC Sierra?
- Faulty Throttle Body Assembly
- Throttle Body Assembly harness is open or shorted
- Throttle Body Assembly circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P122B 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 P122B 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.
Need more information about the P122B 2014 GMC Sierra code?
Need more information on how to fix the P122B 2014 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P122B 2014 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P122B 2014 GMC Sierra Code
1. What does the OBDII code P122B mean on a 2014 GMC Sierra?
P122B indicates an issue with the intake air flow valve control supply voltage circuit, which affects the valve's ability to regulate air flow into the engine.
2. What are common symptoms of code P122B on a GMC Sierra?
Symptoms may include reduced engine performance, rough idling, poor acceleration, and possibly a check engine light.
3. What causes code P122B on a 2014 GMC Sierra?
Common causes include a faulty intake air flow valve, damaged wiring or connectors, or issues with the control module supplying proper voltage.
4. Can I drive my 2014 GMC Sierra with code P122B?
While the vehicle may still be drivable, continuing to drive could cause further damage or lead to reduced performance. It’s best to address the issue promptly.
5. How do I diagnose code P122B on a GMC Sierra?
Inspect the wiring and connectors for damage, test the intake air flow valve for proper function, and check the control module for voltage output.
6. How can I fix code P122B on my 2014 GMC Sierra?
Repairs may involve replacing the intake air flow valve, repairing damaged wiring or connectors, or updating/replacing the control module.
7. How much does it cost to repair code P122B on a GMC Sierra?
Repair costs vary depending on the specific issue, but replacing the intake air flow valve can range from $200 to $500, excluding labor.
8. Can a dirty intake air flow valve cause code P122B?
Yes, a dirty or clogged valve may restrict air flow and affect its operation, potentially triggering this code.
9. Will a dead battery cause code P122B on a GMC Sierra?
A weak or dead battery might contribute to voltage issues in the circuit, but it's not a common cause of this specific code.
10. Do I need a professional mechanic to fix code P122B?
While experienced DIYers can attempt repairs, diagnosing and fixing electrical issues often require specialized tools and expertise, so consulting a mechanic is recommended.
Discuss the causes and fixes for P122B 2014 GMC Sierra OBDII Code
Code P122B 2014 GMC Sierra comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
