P122B 2017 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 2017 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 2017 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 2017 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 2017 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 2017 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 P122B 2017 GMC Sierra Code
1. What does the OBDII code P122B mean on a 2017 GMC Sierra?
P122B indicates an issue with the Intake Air Flow Valve Control Supply Voltage Circuit, which affects the valve's operation and the engine's airflow management.
2. What are the symptoms of code P122B in a GMC Sierra?
Common symptoms include reduced engine performance, poor fuel efficiency, rough idling, hesitation during acceleration, and possibly an illuminated check engine light.
3. What causes the P122B code in a 2017 GMC Sierra?
Potential causes include a faulty intake air flow valve, damaged wiring or connectors in the circuit, a blown fuse, or an issue with the power supply to the valve.
4. Can I drive my GMC Sierra with the P122B code?
While the vehicle may still operate, driving with the P122B code can lead to poor performance and potentially cause further damage to the engine or emissions system.
5. How do I diagnose the P122B code in a 2017 GMC Sierra?
Diagnosis typically involves scanning the vehicle for additional codes, visually inspecting the wiring and connectors, testing the intake air flow valve, and checking for proper voltage in the circuit.
6. How is the P122B code fixed?
Repairs may include replacing the intake air flow valve, repairing or replacing damaged wiring or connectors, replacing a blown fuse, or addressing issues with the power supply.
7. How much does it cost to fix the P122B code on a GMC Sierra?
Repair costs vary depending on the cause but can range from $100 for minor wiring repairs to $500 or more for replacing the intake air flow valve.
8. Can a dirty intake system cause the P122B code?
A dirty intake system is unlikely to directly cause P122B, but debris or buildup can indirectly affect valve operation and airflow management.
9. Will clearing the P122B code fix the problem?
Clearing the code will remove it temporarily, but unless the root cause is addressed, the code and associated issues will likely return.
10. What tools are needed to troubleshoot the P122B code?
Basic tools include an OBDII scanner, a multimeter for testing voltages, and possibly wiring repair tools for addressing electrical issues.
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