Code Definition

B1947 — Climate Control A/C Post Evaporator Sensor Circuit Short To Ground

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

About B1947

B1947 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 B1947 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit; and 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.

B1947 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 B1947 code is set by the Electronic Automatic Temperature Control (EATC) module or climate control module when it detects a short to ground condition on the post evaporator temperature sensor circuit. This sensor is positioned at the outlet face of the evaporator core and monitors the air temperature after it passes through the evaporator, allowing the climate control system to manage A/C compressor cycling and prevent evaporator icing. When the module sees the signal voltage pinned at or near zero volts instead of the expected variable signal that tracks the discharge air temperature, thi...

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