P122B 2017 Chevrolet Silverado 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 Chevrolet Silverado 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 Chevrolet Silverado 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 Chevrolet Silverado?
- 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 Chevrolet Silverado?
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 Chevrolet Silverado 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 Chevrolet Silverado Code
What does the OBDII code P122B mean for a 2017 Chevrolet Silverado?
1. P122B indicates an issue with the Intake Air Flow Valve Control Supply Voltage Circuit, which monitors the voltage for the intake air flow valve control system. 2.
What are common symptoms of the P122B code?
Common symptoms include reduced engine performance, poor acceleration, an illuminated check engine light, and, in some cases, limp mode activation. 3.
What causes the P122B code to appear?
The code can be caused by a faulty intake air flow valve, damaged wiring, corroded connectors, low system voltage, or a malfunctioning engine control module (ECM). 4.
Can I drive my 2017 Chevrolet Silverado with the P122B code?
Driving with this code is not recommended as it can lead to reduced engine efficiency, potential stalling, and further damage to the intake system. 5.
How can I diagnose the P122B code?
Start by using a scan tool to confirm the code, then inspect the intake air flow valve, wiring, connectors, and voltage supply for damage or faults. 6.
What repairs can fix the P122B code?
Repairs may include replacing the intake air flow valve, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the ECM if necessary. 7.
How much does it cost to fix the P122B code?
Repair costs range from $100 to $500 depending on the specific issue, with labor and part prices varying by location and the extent of the problem. 8.
Can a dirty air filter cause a P122B code?
No, a dirty air filter is unlikely to directly cause this code, although it may contribute to airflow issues. The problem is more likely related to the valve control circuit. 9.
Will clearing the code with a scan tool fix the P122B issue?
Clearing the code might temporarily turn off the check engine light, but it won’t resolve the underlying issue causing the code to appear. 10.
Is the P122B code related to the throttle body?
While the code specifically refers to the intake air flow valve, throttle body issues can sometimes contribute to airflow problems, so they should be inspected as part of the diagnostic process.
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