Engine-Codes - Generic - B12A5

B12A5 - Mode Door Actuator Feedback Circuit Open Or Shorted to Battery Voltage

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

B12A5 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 B12A5 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 B12A5 code

Labor: 1.0

The cost to diagnose the B12A5 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.
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Possible Symptoms

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

B12A5 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.

More Information

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Information for specific makes

  • B12A5 FORD Mode Door Actuator Feedback Circuit Open Or Shorted to Battery Voltage
  • B12A5 LINCOLN Mode Door Actuator Feedback Circuit Open Or Shorted to Battery Voltage
  • B12A5 MERCURY Mode Door Actuator Feedback Circuit Open Or Shorted to Battery Voltage

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