Code Definition

B1948 — Climate Control Water Temperature Sensor Circuit Failure

System: Body  |  Type: Manufacturer-Specific  |  Make: Ford

About B1948

B1948 is a manufacturer-specific body diagnostic trouble code recorded for Ford vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1948 is stored, the module has detected a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

B1948 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The B1948 code is stored by the Electronic Automatic Temperature Control (EATC) module when it detects a failure on the climate control water temperature sensor circuit. The water temperature sensor monitors engine coolant temperature for the climate control strategy, allowing the module to make decisions such as enabling or delaying heater output until coolant is warm enough, and managing A/C compressor engagement based on engine thermal load. When the module cannot obtain a plausible reading from the sensor, either due to an open circuit, a short circuit, or a signal out of range, the fault ...

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