P122C 2017 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 2017 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 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 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 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 P122C 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 P122C 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 P122C 2017 Chevrolet Silverado Code
1. What does the OBDII code P122C mean on a 2017 Chevrolet Silverado?
P122C indicates a short circuit in the Intake Air Flow Valve Control Circuit, which impacts the vehicle's air intake system performance.
2. What are common symptoms of code P122C on a 2017 Chevrolet Silverado?
Symptoms may include reduced engine power, rough idling, poor acceleration, or the Check Engine Light illuminating.
3. What causes the P122C code to appear on a Chevrolet Silverado?
Common causes include a damaged intake air flow valve, a shorted or corroded wiring harness, or a malfunctioning control module.
4. Can I drive my 2017 Chevrolet Silverado with the P122C code?
Driving is possible but not recommended, as it can lead to poor performance and potential engine damage over time.
5. How can I diagnose the P122C code on my Silverado?
Inspect the wiring and connectors for damage, test the intake air flow valve for proper operation, and verify the control module's functionality.
6. What tools are needed to fix code P122C?
You'll need an OBDII scanner, a multimeter for electrical testing, and possibly basic hand tools for component inspection or replacement.
7. How much does it cost to fix the P122C code on a 2017 Chevrolet Silverado?
Repair costs vary but typically range from $100 to $500, depending on whether you're replacing wiring, the flow valve, or the control module.
8. Can a dirty air filter cause the P122C code?
No, a dirty air filter is unlikely to trigger this code, as it specifically relates to an electrical issue in the control circuit.
9. Does the P122C code require reprogramming the ECU?
Reprogramming the ECU is not usually necessary unless the control module itself is faulty and has been replaced.
10. How can I prevent the P122C code from occurring again?
Regularly inspect and maintain the intake system, keep electrical connections clean and secure, and address wiring issues promptly.
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