B2956 Code - Blend Door Close Circuit Failure Or Short
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 Blend Door Actuator Motor, Blend Door Actuator Motor harness is open or shorted, Blend 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
- B2956 indicates Blend Door Close Circuit Failure Or Short.
- Common causes
- Common causes include Faulty Blend Door Actuator Motor, Blend Door Actuator Motor harness is open or shorted, Blend 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 B2956 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 B2956?
- Faulty Blend Door Actuator Motor
- Blend Door Actuator Motor harness is open or shorted
- Blend 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 B2956?
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 B2956 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
- B2956 Ford — Blend Door Close Circuit Failure Or Short
- B2956 Lincoln — Blend Door Close Circuit Failure Or Short
- B2956 Mercury — Blend Door Close Circuit Failure Or Short
Frequently Asked Questions about B2956 Code
1. What are the common symptoms of OBDII code B2956 (Blend Door Close Circuit Failure Or Short)?
- Common symptoms include issues with the heating and air conditioning system, such as inconsistent temperature control or the inability to adjust the airflow.
2. What can cause the OBDII code B2956 to trigger?
- The code B2956 is typically triggered by a malfunction in the blend door close circuit, which may be caused by a short circuit, wiring issues, or a faulty blend door actuator.
3. How can I diagnose the blend door close circuit failure or short associated with code B2956?
- Diagnosing this issue usually involves inspecting the blend door actuator, checking the wiring for any damage or shorts, and using a multimeter to test the circuit for continuity.
4. What are the possible repair options for OBDII code B2956?
- Repair options may include replacing the blend door actuator, repairing any damaged wiring, or resetting the system to clear the code and see if the issue recurs.
5. Is it safe to continue driving with OBDII code B2956 present?
- While the code B2956 itself may not directly affect the drivability of the vehicle, it is important to address the underlying issue to ensure proper functioning of the heating and air conditioning system.
6. Can I reset the OBDII code B2956 without fixing the underlying issue?
- While you can clear the code with an OBDII scanner, it is recommended to diagnose and repair the blend door close circuit failure or short to prevent further issues with the HVAC system.
7. Are there any preventive measures to avoid OBDII code B2956 in the future?
- Regularly inspecting the HVAC system, checking for unusual temperature control issues, and addressing any wiring issues promptly can help prevent the recurrence of code B2956.
8. How much does it typically cost to repair OBDII code B2956 at a mechanic or dealership?
- The cost of repairing code B2956 can vary depending on the exact cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.
9. Can a DIY enthusiast fix OBDII code B2956 at home?
- Depending on your mechanical skills and access to tools, DIY enthusiasts may be able to diagnose and repair the blend door close circuit failure or short associated with code B2956 at home.
10. Does OBDII code B2956 affect vehicle performance or fuel efficiency?
- While code B2956 is related to the HVAC system and may not directly impact performance or fuel efficiency, addressing the issue promptly can help maintain overall vehicle functionality.
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