B12A4 - Mode Door Actuator Drive Circuit Shorted To Battery Voltage

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

B12A4 Possible Causes

  • Stuck or damaged linkage or door
  • Faulty Mode Door Actuator
  • Mode Door Actuator harness is open or shorted
  • Mode Door Actuator circuit poor electrical connection
  • Electronic Manual Temperature Control (EMTC) Module
  • Electronic Automatic Temperature Control (EATC) Module

How do I fix code B12A4

    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.

Cost of diagnosing the B12A4 code

    Labor: 1.0

    The cost of diagnosing the B12A4 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.

B12A4 Possible Symptoms

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

B12A4 Meaning

Under normal operation, to rotate the mode door actuator clockwise, the Electronic Manual Temperature Control (EMTC) or Electronic Automatic Temperature Control (EATC) module supplies voltage and ground to the floor/defrost/panel mode door actuator motor through the circuit. To rotate the mode door actuator counterclockwise, the EMTC module or EATC module reverses the voltage and ground circuits.
The mode door actuator feedback resistor is supplied a ground from the EMTC module or EATC module and a 5-volt reference voltage. The EMTC module or EATC module reads the voltage on the mode door actuator feedback circuit to determine the mode door actuator position by the position of the actuator feedback resistor wiper arm.
OBDII Code B12A4 - Mode Door Actuator Drive Circuit Shorted To Battery Voltage - Engine-Codes.com

B12A4 More Information

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B12A4 Information for specific makes

  • B12A4 FORD Mode Door Actuator Drive Circuit Shorted To Battery Voltage
  • B12A4 LINCOLN Mode Door Actuator Drive Circuit Shorted To Battery Voltage
  • B12A4 MERCURY Mode Door Actuator Drive Circuit Shorted To Battery Voltage

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