P122C 2015 Chevrolet Silverado Code - Intake Air Flow Valve Control Circuit Shorted
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
- P122C 2015 Chevrolet Silverado indicates Intake Air Flow Valve Control Circuit Shorted.
- 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 P122C 2015 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 a high current short circuit on the intake airflow valve control circuit for greater than 0.5 s.
What are the Possible Causes of the DTC P122C 2015 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 P122C 2015 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 P122C 2015 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 P122C 2015 Chevrolet Silverado Code
1. What does the P122C code mean on a 2015 Chevrolet Silverado?
The P122C code indicates an issue with the Intake Air Flow Valve Control Circuit, specifically a short in the circuit.
2. What are the common symptoms of the P122C code on a Chevy Silverado?
Symptoms may include reduced engine performance, poor fuel economy, rough idling, and the check engine light being illuminated.
3. What causes the P122C code to appear?
Common causes include damaged wiring, a faulty intake air flow valve, a short circuit in the control wiring, or a malfunctioning powertrain control module (PCM).
4. Can I drive my 2015 Chevrolet Silverado with a P122C code?
While the vehicle may still be drivable, it’s not recommended as it can lead to reduced performance and potential engine damage over time.
5. How do I diagnose the P122C code on a Chevy Silverado?
Diagnose it by using an OBDII scanner to confirm the code, visually inspecting the wiring and connectors for damage, testing the intake air flow valve, and checking for shorts in the circuit.
6. How can I fix the P122C code on my 2015 Chevy Silverado?
Repairs may involve replacing damaged wiring, repairing or replacing the intake air flow valve, or reprogramming/updating the PCM if necessary.
7. How much does it cost to repair the P122C code on a Silverado?
Repair costs can vary, but replacing the intake air flow valve typically costs between $150 and $300, plus labor charges if performed by a mechanic.
8. Can a dirty air filter cause the P122C code?
While a dirty air filter itself won’t trigger the P122C code, restricted airflow can contribute to related performance issues. Inspect and replace the air filter if necessary.
9. Is the intake air flow valve the same as the throttle body?
No, the intake air flow valve and throttle body are different components, though they both regulate airflow. The intake air flow valve controls specific airflow needs, often in conjunction with emissions systems.
10. Will clearing the code with an OBDII scanner fix the issue?
Clearing the code may temporarily turn off the check engine light, but it won’t resolve the underlying problem causing the P122C code. Proper diagnosis and repair are required.
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