B129B Lincoln Code - Driver Blend Door Actuator Drive Circuit Shorted To Battery Voltage
Quick Answer
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. Common causes include Stuck or damaged linkage or door, Faulty Blend Door Actuator, Blend Door Actuator harness is open or shorted. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
- What it means
- B129B Lincoln indicates Driver Blend Door Actuator Drive Circuit Shorted To Battery Voltage.
- Common causes
- Common causes include Stuck or damaged linkage or door, Faulty Blend Door Actuator, Blend Door Actuator harness is open or shorted.
- Severity
- Moderate - service should be scheduled soon.
- Can I drive?
- The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
Code B129B Lincoln Description
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.
What are the Possible Causes of the DTC B129B Lincoln?
- 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 DTC B129B Lincoln?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B129B Lincoln code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about B129B Lincoln Code
1. What are the common symptoms of OBDII code B129B in a Lincoln vehicle?
- Common symptoms include issues with the driver side temperature control, inconsistent heating or cooling, and the inability to adjust the temperature settings.
2. What does it mean when the driver blend door actuator drive circuit is shorted to battery voltage?
- This means that there is an electrical issue where the driver blend door actuator drive circuit is receiving a constant voltage from the vehicle's battery, causing a malfunction in the temperature control system.
3. What are the possible causes of the driver blend door actuator drive circuit being shorted to battery voltage?
- Possible causes include a damaged or faulty blend door actuator, wiring issues, a malfunctioning climate control module, or a short circuit in the electrical system.
4. How can I diagnose OBDII code B129B in my Lincoln vehicle?
- Diagnosing this code typically involves using a diagnostic scanner to read the trouble code, checking the blend door actuator and related wiring for any visible damage, and conducting electrical tests to identify the source of the short circuit.
5. Is it safe to continue driving my Lincoln with OBDII code B129B present?
- It is not recommended to continue driving with this code present, as it can lead to further damage to the climate control system and potentially affect the overall functionality of the heating and cooling in the vehicle.
6. Can I repair OBDII code B129B in my Lincoln vehicle myself?
- While some DIY enthusiasts may attempt to address this issue, it is recommended to consult a professional mechanic or dealership for proper diagnosis and repair to ensure the problem is resolved correctly.
7. How much does it typically cost to repair OBDII code B129B in a Lincoln vehicle?
- The cost of repair can vary depending on the cause of the issue, but it may involve replacing the blend door actuator, repairing wiring, or addressing other electrical components. Costs can range from a few hundred to over a thousand dollars.
8. Are there any preventive measures to avoid OBDII code B129B from occurring in the future?
- Regular maintenance checks, including inspecting the climate control system and addressing any unusual temperature control issues promptly, can help prevent the occurrence of this code in the future.
9. Will resetting the OBDII code B129B clear the issue temporarily?
- Resetting the code may temporarily clear the warning light, but it will not fix the underlying problem causing the short circuit in the driver blend door actuator drive circuit.
10. How long does it typically take to repair OBDII code B129B in a Lincoln vehicle?
- The repair time can vary based on the exact cause of the issue and the complexity of the repair needed. In most cases, repair can take a few hours to half a day, depending on the extent of the repair work required.
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