P122D Buick 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 Buick 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 Buick 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 Buick?
- 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 Buick?
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 Buick 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 Buick Code
1. What are the common symptoms of OBDII code P122D in a Buick related to the Intake Air Flow Valve Position Sensor?
The common symptoms include poor engine performance, rough idling, reduced fuel efficiency, and potentially stalling.
2. What can cause the Intake Air Flow Valve Position Sensor to exceed its learning limit in a Buick triggering code P122D?
Potential causes include a faulty sensor, dirty/clogged air intake system, vacuum leaks, wiring issues, or a problem with the PCM.
3. How can I diagnose the underlying issue causing OBDII code P122D in my Buick?
Diagnosis involves checking the intake air flow valve position sensor, inspecting the air intake system for blockages, testing for vacuum leaks, and scanning the PCM for any related errors.
4. Is it safe to continue driving my Buick with OBDII code P122D indicating the Intake Air Flow Valve Position Sensor issue?
It is recommended to address the issue promptly to prevent further damage to the engine or related components. Continuing to drive with this fault may lead to more severe problems.
5. Can I reset the OBDII code P122D in my Buick related to the Intake Air Flow Valve Position Sensor without fixing the underlying issue?
While you can reset the code using an OBDII scanner, it will likely reappear if the root cause is not addressed. Resetting without fixing the problem may lead to ongoing performance issues.
6. Are there any specific repair tips for resolving OBDII code P122D in a Buick?
Ensure thorough cleaning of the air intake system, inspect and replace the sensor if necessary, check for any damaged wiring, and perform a PCM reset after completing repairs.
7. How much does it typically cost to repair OBDII code P122D in a Buick caused by the Intake Air Flow Valve Position Sensor issue?
Costs can vary depending on the exact cause and needed repairs, but expect to pay for sensor replacement, possible air intake system cleaning, and any related labor charges.
8. Can a DIY enthusiast fix OBDII code P122D related to the Intake Air Flow Valve Position Sensor in a Buick?
Depending on your mechanical skills and access to tools, you may be able to address some aspects of the issue yourself, such as sensor replacement or basic inspections. However, complex diagnostics may require professional assistance.
9. How urgent is it to address OBDII code P122D in a Buick indicating a problem with the Intake Air Flow Valve Position Sensor?
While the severity may vary, it is generally advisable to address the issue promptly to avoid potential engine performance issues, decreased fuel efficiency, or the risk of stalling while driving.
10. Are there any recalls or service bulletins related to OBDII code P122D and the Intake Air Flow Valve Position Sensor in Buick vehicles?
It is recommended to check with a Buick dealership or official sources to inquire about any recalls or service bulletins specific to this OBDII code and related sensor issues in your vehicle.
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