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P122D Buick Code - Intake Air Flow Valve Position Sensor Exceeded Learning Limit

- Code Popularity: 147 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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Code P122D Buick Possible Causes

  • Faulty Intake Air Flow Valve
  • Intake Air Flow Valve harness is open or shorted
  • Intake Air Flow Valve circuit poor electrical connection

How do I Fix the Code P122D Buick?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Does your Buick have Safety Recalls? → Check here

What is the Cost to Diagnose the Code P122D Buick?

Labor: 1.0

The cost of diagnosing the P122D Buick code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

What are Code P122D Buick Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

Code P122D Buick Description

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.
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

OBDII Code P122D Buick - Intake Air Flow Valve Position Sensor Exceeded Learning Limit -
P122D Buick Code - Intake Air Flow Valve Position Sensor Exceeded Learning Limit

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