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Engine-Codes - Generic - B12A4

B12A4 Code - Mode Door Actuator Drive Circuit Shorted To Battery Voltage

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents
What does this mean?

|B12A4 code 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 is the B12A4 code repair?

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 B12A4 code

Labor: 1.0

The cost to diagnose the B12A4 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.

|What are B12A4 code possible symptoms?

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

|What is B12A4 code 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.

|Need more information with the B12A4 code?

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|B12A4 code 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

|Need help with a B12A4 code?

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