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P122B Chevrolet Code - Intake Air Flow Valve Control Supply Voltage Circuit

- Code Popularity: 210 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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Code P122B Chevrolet Possible Causes

  • 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 do I Fix the Code P122B Chevrolet?

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.

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Code P122B Chevrolet Tech Notes





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What is the Cost to Diagnose the Code P122B Chevrolet?

Labor: 1.0

The cost of diagnosing the P122B Chevrolet 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 P122B Chevrolet Possible Symptoms?

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

Code P122B Chevrolet 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 an open circuit on the intake airflow valve control circuit.

OBDII Code P122B Chevrolet - Intake Air Flow Valve Control Supply Voltage Circuit - AutoCodes.com
P122B Chevrolet Code - Intake Air Flow Valve Control Supply Voltage Circuit

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