P122B 2018 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 2018 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 2018 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 2018 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 2018 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 2018 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 2018 Chevrolet Silverado Code
1. What does the OBDII code P122B mean on a 2018 Chevrolet Silverado?
The P122B code indicates an issue with the Intake Air Flow Valve Control Supply Voltage Circuit, which may involve a malfunction in the electrical circuit that controls the intake air flow valve.
2. What are the common symptoms of the P122B code in a 2018 Chevrolet Silverado?
Symptoms may include reduced engine performance, poor acceleration, rough idling, or the vehicle entering "limp mode."
3. What causes the P122B code to appear on a 2018 Chevrolet Silverado?
Common causes include a faulty intake air flow valve, damaged wiring or connectors in the circuit, or a failed power supply to the valve.
4. Can a dirty throttle body cause the P122B code?
While unlikely, a dirty throttle body can contribute to airflow-related issues, but the P122B code specifically points to an electrical circuit problem.
5. How can I diagnose the P122B code on my 2018 Chevrolet Silverado?
Diagnosis involves checking the wiring and connectors for damage, testing the intake air flow valve for proper operation, and verifying the power supply with a multimeter.
6. Is it safe to drive my 2018 Chevrolet Silverado with the P122B code?
Driving with this code is not recommended, as it can lead to poor performance, potential damage to the engine, or unsafe driving conditions.
7. Can a blown fuse cause the P122B code?
Yes, a blown fuse in the circuit supplying power to the intake air flow valve can cause the P122B code.
8. How much does it cost to repair the P122B code on a 2018 Chevrolet Silverado?
Repair costs vary depending on the issue but may range from $100 for wiring repairs to $500 or more for replacing the intake air flow valve.
9. Can the P122B code trigger the check engine light?
Yes, the P122B code will typically trigger the check engine light when detected.
10. How can I prevent the P122B code from recurring on my 2018 Chevrolet Silverado?
Regular maintenance, including inspecting wiring and connectors for damage, and ensuring the intake system is clean and functional, can help prevent this code from recurring.
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