P122C Cadillac 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 Cadillac 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 Cadillac 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 Cadillac?
- 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 Cadillac?
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 Cadillac 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.
Need more information about the P122C Cadillac code?
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Frequently Asked Questions about P122C Cadillac Code
1. What are the common symptoms of OBDII code P122C (Cadillac) related to the Intake Air Flow Valve Control Circuit Shorted?
The common symptoms include rough idling, reduced engine performance, stalling, and illuminated Check Engine Light.
2. What can cause the Intake Air Flow Valve Control Circuit to become shorted in a Cadillac?
Potential causes of the Intake Air Flow Valve Control Circuit shorted issue can include damaged wiring, a faulty intake air flow valve, or a malfunctioning engine control module (ECM).
3. How serious is the P122C OBDII code in a Cadillac?
While the severity can vary, it is important to address this issue promptly to prevent further damage to the engine and ensure optimal performance.
4. Can driving with OBDII code P122C (Intake Air Flow Valve Control Circuit Shorted) cause further damage to my Cadillac?
Continuing to drive with this issue may lead to poor engine performance, reduced fuel efficiency, and potential damage to other engine components over time.
5. How can I diagnose the cause of OBDII code P122C on my Cadillac?
A thorough inspection of the intake air flow valve, wiring, and ECM is recommended. Using a diagnostic scanner to retrieve specific error codes can also aid in pinpointing the exact cause.
6. Is it safe to continue driving my Cadillac with a P122C trouble code?
It is not recommended to continue driving your Cadillac with this code present, as it can lead to potential engine issues and may impact overall vehicle performance and safety.
7. Can I repair the Intake Air Flow Valve Control Circuit Shorted issue in my Cadillac myself?
Depending on your level of automotive expertise, you may be able to address this issue yourself by inspecting the wiring, intake air flow valve, and ECM for any visible damage and replacing faulty components as needed.
8. Will resetting the Check Engine Light resolve the P122C code on my Cadillac?
Simply resetting the Check Engine Light may temporarily clear the code, but it is crucial to address the underlying issue causing the fault code to prevent it from reoccurring.
9. How much can I expect to pay for a professional repair of the P122C code on my Cadillac?
The cost of professional repair for the Intake Air Flow Valve Control Circuit Shorted issue can vary depending on the specific cause and the labor rates of the repair shop. It is recommended to obtain quotes from multiple auto repair shops.
10. How long does it typically take to repair the P122C code on a Cadillac?
The repair time can vary based on the exact cause of the issue and the availability of replacement parts. In some cases, the repair can be completed within a few hours, while more complex issues may require additional time for diagnosis and repair.
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