P122D GMC Code - Intake Air Flow Valve Position Sensor Exceeded Learning Limit
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 Intake Air Flow Valve, Intake Air Flow Valve harness is open or shorted, Intake Air Flow Valve 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
- P122D GMC indicates Intake Air Flow Valve Position Sensor Exceeded Learning Limit.
- Common causes
- Common causes include Faulty Intake Air Flow Valve, Intake Air Flow Valve harness is open or shorted, Intake Air Flow Valve 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 P122D GMC 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 the Intake air flow valve learned closed position is not 4.25 - 4.70 V
What are the Possible Causes of the DTC P122D GMC?
- Faulty Intake Air Flow Valve
- Intake Air Flow Valve harness is open or shorted
- Intake Air Flow Valve circuit poor electrical connection
How to Fix the DTC P122D GMC?
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 P122D GMC 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 P122D GMC Code
1. What are the common symptoms of OBDII code P122D in a GMC related to the Intake Air Flow Valve Position Sensor Exceeded Learning Limit?
The common symptoms include rough idling, decreased engine performance, and potential stalling.
2. What are the possible causes of OBDII code P122D GMC indicating the Intake Air Flow Valve Position Sensor Exceeded Learning Limit?
Possible causes include a faulty intake air flow valve position sensor, wiring issues, or a problem with the engine control module.
3. How can I diagnose the OBDII code P122D GMC for the Intake Air Flow Valve Position Sensor Exceeded Learning Limit?
To diagnose this code, you can use a scan tool to check for any related trouble codes, inspect the intake air flow valve position sensor and its wiring, and test the sensor's functionality.
4. What are the repair options for addressing OBDII code P122D related to the Intake Air Flow Valve Position Sensor Exceeded Learning Limit?
Repair options may involve replacing the faulty intake air flow valve position sensor, repairing any damaged wiring, or reprogramming the engine control module.
5. Can I continue to drive my GMC with OBDII code P122D indicating the Intake Air Flow Valve Position Sensor Exceeded Learning Limit?
It is not recommended to drive the vehicle with this code present as it can lead to further engine performance issues and potential damage if left unaddressed.
6. How urgent is it to address OBDII code P122D GMC related to the Intake Air Flow Valve Position Sensor Exceeded Learning Limit?
It is advisable to address this code as soon as possible to prevent any further damage to the engine and ensure optimal vehicle performance.
7. Is it possible to reset OBDII code P122D GMC without fixing the underlying issue with the Intake Air Flow Valve Position Sensor?
While you can clear the code using a scan tool, it is crucial to address the underlying issue with the intake air flow valve position sensor to prevent the code from reoccurring.
8. Are there any preventive measures to avoid OBDII code P122D GMC related to the Intake Air Flow Valve Position Sensor Exceeded Learning Limit?
Regular maintenance, such as cleaning the intake system components and ensuring proper sensor function during tune-ups, can help prevent issues leading to this code.
9. How much does it typically cost to repair OBDII code P122D in a GMC due to the Intake Air Flow Valve Position Sensor Exceeded Learning Limit?
The cost of repairs can vary depending on the extent of the issue, but it may involve sensor replacement, wiring repairs, or module reprogramming, which could range from a few hundred to over a thousand dollars.
10. Can a DIY enthusiast with automotive knowledge fix OBDII code P122D GMC related to the Intake Air Flow Valve Position Sensor Exceeded Learning Limit?
While some enthusiasts may have the skills to address this issue, it is recommended to consult a professional mechanic for an accurate diagnosis and proper repair to ensure the problem is resolved correctly.
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