B1253 on 2007-2020 Ford Edge (SE, SEL, Limited, Titanium, Sport, ST) — Air Temperature Internal Sensor Circuit Short To Ground
1 vehicles · 1 makes · $180-$650 repair
Most Reported On
B1253 is an OBD-II diagnostic trouble code meaning “Air Temperature Internal Sensor Circuit Short To Ground.” The Electronic Automatic Temperature Control (EATC) module monitors its in-car (internal) air temperature sensor on a reference-voltage circuit. B1253 sets when the module senses an excessive voltage drop on that circuit — the signal has dropped to or near ground — indicating the sensor or its wiring is shorted to ground. Ford's companion code B1251 covers the same circuit open or shorted high. With no valid cabin temperature, automatic temperature control cannot calculate blend-door position correctly. This code is most commonly reported on 2007-2020 Ford Edge (SE, SEL, Limited, Titanium, Sport, ST), with repair costs ranging from $180 to $650.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
B1253 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 B1253 mean?
B1253 stands for "Air Temperature Internal Sensor Circuit Short To Ground." The Electronic Automatic Temperature Control (EATC) module monitors its in-car (internal) air temperature sensor on a reference-voltage circuit. B1253 sets when the module senses an excessive voltage drop on that circuit — the signal has dropped to or near ground — indicating the sensor or its wiring is shorted to ground. Ford's companion code B1251 covers the same circuit open or shorted high. With no valid cabin temperature, automatic temperature control cannot calculate blend-door position correctly.
What are the most common causes of B1253?
The most common causes of B1253 are: Failed in-car air temperature sensor (internal thermistor shorted), Sensor harness chafed or pinched, shorting the signal circuit to ground, Corroded or water-intruded sensor connector / poor electrical connection, Failed Electronic Automatic Temperature Control (EATC) module. The specific cause varies by vehicle.
How much does it cost to fix B1253?
Repair costs for B1253 range from $180 to $650, depending on the vehicle and root cause.
Which vehicles are affected by B1253?
Au7o has documented B1253 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.