Engine-Codes - Gmc - B0434 GMC

B0434 GMC Code - Auxiliary HVAC Door Actuator Range/Performance

- Code Popularity: 3,959 Views
- Repair Importance Level: 1/3
- Repair Difficulty Level: 2/3
Table of contents

|What are the Possible Causes of the Code B0434 GMC?

  • Faulty Auxiliary Air Temperature Actuator
  • Auxiliary Air Temperature Actuator harness is open or shorted
  • Auxiliary Air Temperature Actuator circuit poor electrical connection
  • Faulty Auxiliary Heating and Cooling Systems (HVAC) Control Module

|How to Fix the B0434 GMC Code?

Start by checking 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.

|What is the Cost to Diagnose the Code B0434 GMC?

Labor: 1.0

The cost to diagnose the B0434 GMC code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

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|What are Code B0434 GMC Possible Symptoms?

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

|What Does the B0434 GMC Code Mean?

The Auxiliary Heating, Ventilation, and Air Conditioning (HVAC) Control Module controls the auxiliary HVAC door actuators to regulate the airflow through the auxiliary HVAC system. Each actuator consists of a stepper motor, a logic circuit, and a potentiometer. The potentiometer inside the door actuator allows the module to monitor the current position of the actuator drive shaft. The module supplies a 5-volt source voltage to the potentiometer on the 5-volt reference circuit. The module supplies ground to the potentiometer through the low reference circuit. The auxiliary HVAC control module monitors the voltage drop across the potentiometer on the door position signal circuit. When the actuator shaft rotates, the voltage on the door position signal circuit changes. The module converts the voltage value to a count value where 1 volt is approximately equal to 51 counts.
The auxiliary HVAC control module calibrates the travel range of the auxiliary HVAC door actuators when it is initially powered by the battery positive voltage circuit. During calibration, the module commands the actuators in each direction until door travel is stopped. The module stores the minimum door positions and the maximum door positions of each actuator into memory. The total travel range is calculated by subtracting the minimum door position from the maximum door position. The door actuators can be calibrated again with a scan tool.

Auxiliary HVAC Door Actuator Range/Performance

|Need more Information on the B0434 GMC Code?

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|Need Help with the B0434 GMC Code?

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