B121D FORD - Rear HVAC Mode Control Input Circuit Short
B121D FORD Possible Causes
- Faulty Rear HVAC Mode Control
- Rear HVAC Mode Control harness is open or shorted
- Rear HVAC Mode Control circuit poor electrical connection
- Faulty Heating, Ventilation, and Air-Conditioning (HVAC) Module
How do I fix code B121D FORD?Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
B121D:15 Rear HVAC Mode Control Input Circuit Short to Battery or Open
Cost of diagnosing the B121D FORD code
Labor: 1.0The cost of diagnosing the B121D FORD code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
- Engine Light ON (or Service Engine Soon Warning Light)
B121D FORD DescriptionUnder normal operation, the rear auxiliary control is supplied a 5-volt reference and ground from the Heating, Ventilation, and Air-Conditioning (HVAC) Module. When the auxiliary blower motor speed, airflow mode or temperature control is adjusted, the HVAC module reads the voltage from the rear auxiliary climate controls on the auxiliary blower motor speed, airflow mode, and temperature control feedback circuits to determine the requested setting. The OBDII code sets when the HVAC module senses an open, or short to ground or voltage on the rear auxiliary climate controls temperature input circuit.
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