Engine-Codes - Generic - B12B8

B12B8 Code - Driver Blend Door Actuator Slow Or Door Obstructed

- Code Popularity: 1,090 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents

|What are the Possible Causes of the Code B12B8?

  • 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 to Fix the B12B8 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.

|What is the Cost to Diagnose the Code B12B8?

Labor: 1.0

The cost to diagnose the B12B8 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.

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|What are Code B12B8 Possible Symptoms?

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

|What Does the B12B8 Code Mean?

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.

Driver Blend Door Actuator Slow Or Door Obstructed

|Need more Information on the B12B8 Code?

Need more information on how to fix the B12B8 code? Get Access to Factory Service Manuals

|Code B12B8 Information for Specific Makes

  • B12B8 Ford Driver Blend Door Actuator Slow Or Door Obstructed
  • B12B8 Lincoln Driver Blend Door Actuator Slow Or Door Obstructed
  • B12B8 Mercury Driver Blend Door Actuator Slow Or Door Obstructed

|Need Help with the B12B8 Code?

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