Engine-Codes - Generic - B12A4

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

- Code Popularity: 843 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
What is this?
Table of contents
What does this mean?

|What are the Possible Causes of the Code B12A4?

  • 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 to Fix the B12A4 Code?

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.

Search B12A4 Questions and Answers

|What is the Cost to Diagnose the Code B12A4?

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.

Does your car have Safety Recalls? → Check here

|What are Code B12A4 Possible Symptoms?

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

|What Does the B12A4 Code Mean?

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.

Mode Door Actuator Drive Circuit Shorted To Battery Voltage

|Need more Information on the B12A4 Code?

Need more information on how to fix the B12A4 code? Get Access to Factory Service Manuals

|Code 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

|Need Help with the B12A4 Code?

Get the B12A4 code diagnosed by a professional: Find a repair shop in your area

Related Information