B297B Code - Blend Door Actuator Drive Circuit Shorted To Ground
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
- B297B indicates Blend Door Actuator Drive Circuit Shorted To Ground.
- 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 B297B 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 B297B?
- 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 B297B?
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 B297B 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
- B297B Buick — Driver Door Open Switch Circuit Not Plausible
- B297B Cadillac — Driver Door Open Switch Circuit Not Plausible
- B297B Chevrolet — Driver Door Open Switch Circuit Not Plausible
- B297B Ford — Blend Door Actuator Drive Circuit Shorted To Ground
- B297B GMC — Driver Door Open Switch Circuit Not Plausible
- B297B Lincoln — Blend Door Actuator Drive Circuit Shorted To Ground
- B297B Mercury — Blend Door Actuator Drive Circuit Shorted To Ground
Frequently Asked Questions about B297B Code
1. What are the common symptoms of OBDII code B297B (Blend Door Actuator Drive Circuit Shorted To Ground)?
- The common symptoms include the HVAC system blowing air from the wrong vents, inconsistent temperature control, or the HVAC system not working at all.
2. What causes OBDII code B297B?
- This code is typically caused by a short circuit between the blend door actuator drive circuit and the ground.
3. How can I diagnose OBDII code B297B?
- You can diagnose this code by using a scan tool to read the code, checking the blend door actuator for proper operation, and inspecting the wiring for any shorts or damage.
4. Can I drive my vehicle with OBDII code B297B?
- It is not recommended to drive your vehicle with this code as it can lead to further HVAC system malfunctions and discomfort while driving.
5. How can I repair OBDII code B297B?
- The repair for this code typically involves repairing the short circuit in the blend door actuator drive circuit, replacing any damaged wiring, or replacing the blend door actuator itself.
6. Will resetting the OBDII code B297B make it go away permanently?
- Resetting the code may temporarily clear the error, but if the underlying issue is not addressed, the code is likely to return.
7. Are there any DIY repair tips for OBDII code B297B?
- DIY repair tips include checking the fuse related to the HVAC system, inspecting the wiring for visible damage, and ensuring the blend door actuator is functioning properly.
8. How much does it cost to repair OBDII code B297B at a mechanic?
- The cost of repairing this code at a mechanic can vary depending on the extent of the damage and the specific repairs needed, but it can range from $100 to $300 or more.
9. Can extreme weather conditions impact OBDII code B297B?
- Yes, extreme weather conditions can potentially worsen the symptoms associated with this code, especially if the HVAC system is already struggling due to the blend door actuator issue.
10. Is OBDII code B297B a common issue in certain vehicle makes and models?
- This code can be a common issue in various vehicle makes and models, particularly those with complex HVAC systems and blend door actuators.
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