B298B Code - Mode Door Actuator Drive Circuit Shorted To Ground
Quick Answer
Under normal operation, to rotate the mode door actuator clockwise, the Electronic Manual Temperature Control (EMTC) or Electronic Automatic Temperature Control (EATC) module supplies voltage and ground to the floor/defrost/panel mode door actuator motor through the circuit. Common causes include Stuck or damaged linkage or door, Faulty Mode Door Actuator, Mode 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
- B298B indicates Mode Door Actuator Drive Circuit Shorted To Ground.
- Common causes
- Common causes include Stuck or damaged linkage or door, Faulty Mode Door Actuator, Mode 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 B298B Description
The mode door actuator feedback resistor is supplied a ground from the EMTC module or EATC module and a 5-volt reference voltage. The EMTC module or EATC module reads the voltage on the mode door actuator feedback circuit 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 B298B?
- Stuck or damaged linkage or door
- Faulty Mode Door Actuator
- Mode Door Actuator harness is open or shorted
- Mode Door Actuator circuit poor electrical connection
- Electronic Manual Temperature Control (EMTC) Module
- Electronic Automatic Temperature Control (EATC) Module
How to Fix the DTC B298B?
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 B298B 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
- B298B Ford — Mode Door Actuator Drive Circuit Shorted To Ground
- B298B Lincoln — Mode Door Actuator Drive Circuit Shorted To Ground
- B298B Mercury — Mode Door Actuator Drive Circuit Shorted To Ground
Frequently Asked Questions about B298B Code
1. What are the common symptoms of OBDII code B298B?
- Common symptoms include issues with the HVAC system, such as inconsistent airflow or temperature control, and the inability to properly adjust the mode door positions.
2. What does it mean when the Mode Door Actuator Drive Circuit is shorted to ground?
- This indicates a problem where the electrical circuit responsible for controlling the mode door actuator is making an unintended connection to the vehicle's ground.
3. What are the possible causes of the Mode Door Actuator Drive Circuit shorted to ground?
- Causes can include damaged wiring, a faulty mode door actuator, a malfunctioning HVAC control module, or a short circuit in the electrical system.
4. How can I diagnose the Mode Door Actuator Drive Circuit shorted to ground issue?
- Diagnosing this issue typically involves using a multimeter to test the circuit for continuity and shorts, inspecting the wiring harness for damage, and checking the mode door actuator for proper operation.
5. Can I drive my vehicle with the B298B trouble code?
- While it may be possible to drive the vehicle with this code present, it is not recommended as it can lead to further damage to the HVAC system and potentially affect the comfort and safety of the vehicle occupants.
6. How can I repair OBDII code B298B myself?
- DIY repair options include checking and repairing any damaged wiring, replacing the mode door actuator if necessary, and resetting the trouble code using an OBDII scanner after completing the repairs.
7. Is it necessary to reset the trouble code after repairing the Mode Door Actuator Drive Circuit issue?
- Yes, it is important to reset the trouble code using an OBDII scanner after making the necessary repairs to ensure the issue is resolved and the warning light does not reappear.
8. Can a faulty HVAC control module cause the Mode Door Actuator Drive Circuit shorted to ground problem?
- Yes, a malfunctioning HVAC control module can potentially cause the mode door actuator circuit to short to ground, leading to the B298B trouble code.
9. How much does it typically cost to repair OBDII code B298B at a professional auto repair shop?
- The cost of repairing this issue can vary depending on the underlying cause, but it can range from $200 to $500 or more, including parts and labor.
10. Are there any preventive measures to avoid encountering the Mode Door Actuator Drive Circuit shorted to ground problem?
- Regular maintenance checks on the HVAC system, including inspecting wiring harnesses and components for signs of wear or damage, can help prevent issues that may lead to the B298B trouble code.
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