Engine-Codes - Generic - B12A9

B12A9 - Recirc Door Actuator Drive Circuit Shorted to Battery Voltage

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

B12A9 Possible Causes

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

How is the B12A9 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 B12A9 code

Labor: 1.0

The cost to diagnose the B12A9 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)

B12A9 Meaning

Under normal operation, the air inlet door actuator motors are supplied voltage or ground on the circuit, depending on desired actuator rotation, by the Electronic Manual Temperature Control (EMTC) Module or Electronic Automatic Temperature Control (EATC) Module. The EMTC module or EATC module then supplies the appropriate voltage or ground to the other side of the actuator motor on. The module sets the OBDII code when the Air Inlet Door Actuator is not to factory specifications.

More Information

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Information for specific makes

  • B12A9 FORD Recirc Door Actuator Drive Circuit Shorted to Battery Voltage
  • B12A9 LINCOLN Recirc Door Actuator Drive Circuit Shorted to Battery Voltage
  • B12A9 MERCURY Recirc Door Actuator Drive Circuit Shorted to Battery Voltage

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