B297C Code - Driver Blend Door Actuator Drive Circuit Open
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 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
- B297C indicates Driver Blend Door Actuator Drive Circuit Open.
- Common causes
- Common causes include Stuck or damaged linkage or door, Faulty Blend Door Actuator, Blend Door Actuator harness is open or shorted.
- 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 B297C 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 B297C?
- 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 B297C?
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 B297C 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
- B297C Buick — Driver Door Open Switch Circuit Not Plausible
- B297C Cadillac — Driver Door Open Switch Circuit Not Plausible
- B297C Chevrolet — Driver Door Open Switch Circuit Not Plausible
- B297C Ford — Driver Blend Door Actuator Drive Circuit Open
- B297C GMC — Driver Door Open Switch Circuit Not Plausible
- B297C Lincoln — Driver Blend Door Actuator Drive Circuit Open
- B297C Mercury — Driver Blend Door Actuator Drive Circuit Open
Frequently Asked Questions about B297C Code
1. What does OBDII code B297C mean?
Code B297C indicates an open circuit in the driver blend door actuator drive circuit, which controls the airflow and temperature blend inside the vehicle.
2. What are the common symptoms of code B297C?
Symptoms include inconsistent cabin temperature, inability to control driver-side airflow, strange noises from the dashboard, or the HVAC system not responding properly.
3. What causes the B297C code to appear?
Common causes include a faulty blend door actuator, damaged wiring or connectors in the actuator circuit, or a malfunctioning HVAC control module.
4. Can I still drive with the B297C code active?
Yes, you can drive with this code active, but the HVAC system may not function correctly, leading to discomfort or inability to adjust cabin temperature.
5. How do I diagnose a B297C code?
Start by visually inspecting the blend door actuator wiring and connectors for damage or loose connections. Use a multimeter to check for an open circuit or test the actuator for proper operation.
6. How is the B297C code fixed?
Repairs typically involve replacing the blend door actuator, repairing damaged wiring or connectors, or reprogramming the HVAC control module if necessary.
7. How much does it cost to repair the B297C code?
Repair costs vary but generally range from $150 to $400, depending on whether the issue is with the actuator, wiring, or control module.
8. What tools are needed to fix the B297C code?
You may need a multimeter, OBDII scanner, basic hand tools, and sometimes a replacement blend door actuator or wiring harness.
9. Can the B297C code clear itself?
No, this code will not clear itself. The underlying issue must be repaired, and then the code can be cleared using an OBDII scanner.
10. Is the blend door actuator difficult to replace?
The difficulty depends on the vehicle. In some models, the actuator is easily accessible behind the dashboard, while in others, significant disassembly may be required.
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