B1250 on 2011-2019 Ford Explorer — Air Temperature Internal Sensor Circuit Failure
1 vehicles · 1 makes · $25-$350 repair
Most Reported On
B1250 is an OBD-II diagnostic trouble code meaning “Air Temperature Internal Sensor Circuit Failure.” Ford manufacturer-specific body code (also seen on Lincoln/Mercury and Ford-derived Mazda models). The in-cabin (interior) air temperature sensor that feeds the automatic climate control module has returned an out-of-range or missing signal. The climate control system loses the reference it uses to decide how much heat or A/C to deliver, so automatic temperature control stops regulating properly and may blow full hot or full cold. Ford's own pinpoint tests cover the sibling codes B1251 and B1253 as open- and short-to-ground faults on the same circuit, so the wiring is as suspect as the sensor itself. This code is most commonly reported on 2011-2019 Ford Explorer, with repair costs ranging from $25 to $350.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
B1250 does not use the standard P/B/C/U prefix. It may be a manufacturer-specific code, so verify that a scanner supports your exact year, model and module before buying.
FAQ
What does B1250 mean?
B1250 stands for "Air Temperature Internal Sensor Circuit Failure." Ford manufacturer-specific body code (also seen on Lincoln/Mercury and Ford-derived Mazda models). The in-cabin (interior) air temperature sensor that feeds the automatic climate control module has returned an out-of-range or missing signal. The climate control system loses the reference it uses to decide how much heat or A/C to deliver, so automatic temperature control stops regulating properly and may blow full hot or full cold. Ford's own pinpoint tests cover the sibling codes B1251 and B1253 as open- and short-to-ground faults on the same circuit, so the wiring is as suspect as the sensor itself.
What are the most common causes of B1250?
The most common causes of B1250 are: Failed interior (in-car) air temperature sensor, Open, shorted, or chafed wiring in the sensor circuit, Corroded or backed-out sensor connector pins, Blocked or disconnected aspirator hose/tube feeding cabin air to the sensor (on models that use one), Faulty climate control module (EATC/HVAC head unit). The specific cause varies by vehicle.
How much does it cost to fix B1250?
Repair costs for B1250 range from $25 to $350, depending on the vehicle and root cause.
Which vehicles are affected by B1250?
Au7o has documented B1250 across 1 vehicle models from 1 manufacturers: Ford.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.