Code Definition

B2175 — A/C Request Signal Circuit Short to Ground

System: Body  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About B2175

B2175 is a generic (obd-ii standard) body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B2175 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit.

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.

Because B2175 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The Body Control Module (BCM) monitors the A/C Request signal, which is the input from the climate control panel or HVAC control module indicating that the operator has selected air conditioning operation. DTC B2175 is set when the BCM detects a short to ground on this signal wire, meaning the input is being held at zero volts continuously rather than transitioning between off and on states as expected when the A/C is selected and deselected. The A/C Request signal is normally a digital input that is pulled low only when the request is active, and a constant grounded condition indicates wiring...

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