B2959 Code - Panel/Defrost Door Close Circuit Short/Failure
Quick Answer
Under normal operation, to rotate the mode door actuator clockwise, the Electric Manual Temperature Control (EMTC) module or Electronic Automatic Temperature Control (EATC) module supplies voltage to the Blend, Floor/Defrost and Panel mode door actuator motors through the door actuator feed B circuits, and supplies ground through the door actuator feed A circuits. Common causes include Faulty Panel/Defrost Door Actuator Motor, Panel/Defrost Door Actuator Motor harness is open or shorted, Panel/Defrost Door Actuator Motor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- B2959 indicates Panel/Defrost Door Close Circuit Short/Failure.
- Common causes
- Common causes include Faulty Panel/Defrost Door Actuator Motor, Panel/Defrost Door Actuator Motor harness is open or shorted, Panel/Defrost Door Actuator Motor circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code B2959 Description
The mode door actuator feedback resistors are supplied a ground from the EMTC module or EATC module by the mode door actuator return circuits and a 5-volt reference voltage on the mode door actuator reference circuits. The EMTC module or EATC module reads the voltage on the mode door actuator feedback circuits to determine the mode door actuator position by the position of the actuator feedback resistor wiper arm.
What are the Possible Causes of the DTC B2959?
- Faulty Panel/Defrost Door Actuator Motor
- Panel/Defrost Door Actuator Motor harness is open or shorted
- Panel/Defrost Door Actuator Motor circuit poor electrical connection
- Faulty Electric Manual Temperature Control (EMTC) Module or Electronic Automatic Temperature Control (EATC) Module
How to Fix the DTC B2959?
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 B2959 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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Information for Specific Makes
- B2959 Ford — Panel/Defrost Door Close Circuit Short/Failure
- B2959 Lincoln — Panel/Defrost Door Close Circuit Short/Failure
- B2959 Mercury — Panel/Defrost Door Close Circuit Short/Failure
Frequently Asked Questions about B2959 Code
1. What are the common symptoms of OBDII code B2959?
- Common symptoms include issues with the panel/defrost door operation, such as the door not closing properly or the HVAC system not directing air to the correct vents.
2. What are the possible causes of OBDII code B2959?
- The code may be triggered by a short or failure in the circuit controlling the panel/defrost door, a malfunctioning door actuator, or wiring issues.
3. How can I diagnose OBDII code B2959?
- Diagnosis typically involves inspecting the panel/defrost door actuator, checking the wiring for any shorts or breaks, and using a scanner to read the specific diagnostic trouble codes (DTCs).
4. What are some repair tips for fixing OBDII code B2959?
- Repair tips include replacing the faulty panel/defrost door actuator, repairing any damaged wiring, and resetting the HVAC system after repairs are completed.
5. Can OBDII code B2959 cause any other problems in the vehicle?
- Yes, if left unresolved, this code can lead to issues with the HVAC system's performance, affecting the ability to control air flow and temperature inside the vehicle.
6. Is it safe to drive with OBDII code B2959 present?
- While the vehicle may still be drivable with this code, it is recommended to address the issue promptly to prevent further damage to the HVAC system and ensure optimal comfort while driving.
7. Are there any common mistakes to avoid when dealing with OBDII code B2959?
- Avoid overlooking simple causes like a blown fuse, ensure proper diagnosis before replacing parts, and follow the manufacturer's repair procedures to prevent recurring issues.
8. How long does it typically take to repair OBDII code B2959?
- The repair time can vary depending on the exact cause of the issue and the complexity of accessing the panel/defrost door components, but it may take a few hours to complete.
9. Can I reset OBDII code B2959 without fixing the underlying problem?
- While you can clear the code with an OBDII scanner, it is crucial to address the root cause to prevent the code from reoccurring and ensure proper functioning of the HVAC system.
10. Will OBDII code B2959 cause my check engine light to illuminate?
- This code may trigger the check engine light or another warning light on the dashboard, signaling a problem with the panel/defrost door circuit that requires attention.
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