Code Definition

B1968 — A/C Water Pump Detection Circuit Failure

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

About B1968

B1968 is a manufacturer-specific body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1968 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

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.

B1968 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 monitors the auxiliary A/C water pump circuit to confirm the pump is electrically present and responding when commanded. The auxiliary water pump circulates coolant through the heater core (and on some vehicles through the cabin chiller circuit) so the climate system can deliver heat or maintain conditioned air flow when the engine is off or at low rpm. DTC B1968 sets when the module commands the pump but cannot detect a valid feedback signal or current draw on the pump circuit, indicating either an open in the drive circuit, a missing pump, or a fault in the detecti...

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