B12A1 - Passenger Blend Door Actuator Feedback Circuit Shorted To Ground

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3
Table of contents

B12A1 Possible Causes

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

How do I fix code B12A1?

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.
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Cost of diagnosing the B12A1 code

Labor: 1.0

The cost of diagnosing the B12A1 code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

Possible Symptoms

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

B12A1 Description

Under normal operation, to rotate the blend door actuator clockwise, the Electronic Manual Temperature Control (EMTC) Module or Electronic Automatic Temperature Control (EATC) Module supplies voltage to the blend door actuator motors through the door actuator feed A circuits and supplies ground through the door actuator feed B circuits. To rotate the blend door actuator counterclockwise, the EMTC module or EATC module reverses the voltage and ground circuits.
The blend door actuator feedback resistors are supplied a ground from the EMTC module or EATC module by the blend door actuator return circuits and a 5-volt reference voltage on the blend door actuator reference circuits. The EMTC module or EATC module reads the voltage on the blend door actuator feedback circuits to determine the blend door actuator position by the position of the actuator feedback resistor wiper arm.
OBDII Code B12a1 - Passenger Blend Door Actuator Feedback Circuit Shorted To Ground - AutoCodes.com

More Information

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Information for specific makes

  • B12A1 FORD Passenger Blend Door Actuator Feedback Circuit Shorted To Ground
  • B12A1 LINCOLN Passenger Blend Door Actuator Feedback Circuit Shorted To Ground
  • B12A1 MERCURY Passenger Blend Door Actuator Feedback Circuit Shorted To Ground

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