Code Definition

B1946 — Climate Control A/C Post Evaporator Sensor Circuit Failure

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

About B1946

B1946 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 B1946 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.

B1946 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 Climate Control Module uses the post evaporator temperature sensor (sometimes called the evaporator outlet sensor or in car post evap sensor) to monitor the temperature of air leaving the evaporator core. This sensor is critical for preventing evaporator freeze up by cycling the A/C compressor off when the evaporator outlet temperature drops near zero degrees Celsius. DTC B1946 is set when the climate control module detects an out of range signal from the post evaporator sensor, indicating an open circuit, a short circuit, or a signal that is not changing with conditions. When this code is...

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