B0252 - Mode Door Inoperative

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What does this mean?

B0252 Possible Causes

  • Faulty Mode Door Actuator
  • Mode Door Actuator harness is open or shorted
  • Mode Door Actuator circuit poor electrical connection
  • Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module

Cost of diagnosing the B0252 code

    Labor: 1.0

    The cost of diagnosing the B0252 code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

B0252 Possible Symptoms

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

B0252 Meaning

Stepper motors are used for temperature regulation, air distribution control and recirculation door control. With the switches and dials on the HVAC controls, air temperature door position, mode door position and recirculation door position can be selected. The selected values are passed to the Heating, Ventilation, and Air Conditioning (HVAC) Control Module via serial data. The HVAC control module supplies a 12 V reference voltage to the stepper motors and energizes the 4 stepper motor coils with a pulsed ground signal. The stepper motors move the appropriate doors into the calculated positions, in order to reach the desired positions.
OBDII Code B0252 - Mode Door Inoperative - Engine-Codes.com

B0252 More Information

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B0252 Information for specific makes

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