Engine-Codes - Mercury - B1239 MERCURY

B1239 MERCURY - Airflow Blend Door Driver Circuit Failure

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

B1239 MERCURY Possible Causes

  • Faulty Auxiliary Air Inlet Mode Door Actuator
  • Auxiliary Air Inlet Mode Door Actuator harness is open or shorted
  • Auxiliary Air Inlet Mode Door Actuator circuit poor electrical connection
  • Faulty Traction Battery Control Module (TBCM)

How is the B1239 MERCURY 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 B1239 MERCURY code

Labor: 1.0

The cost to diagnose the B1239 MERCURY 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)

B1239 MERCURY Meaning

When the outside ambient air temperature is cool enough to provide adequate high-voltage battery cooling, the Traction Battery Control Module (TBCM) positions the auxiliary air inlet door actuator in the OPEN position. If the outside ambient air temperature is too warm to provide adequate High Voltage Traction Battery (HVTB) cooling, the TBCM positions the auxiliary air inlet door actuator in the CLOSED position and requests A/C cooling. The TBCM sends and receives signals to the auxiliary air inlet door actuator on circuits, indicating the position of the auxiliary air inlet door. The TBCM controls the movement of the door by controlling power and ground to the auxiliary air inlet door actuator through circuits.

More Information

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