Code Definition

B0429 — Temperature control rear Circuit out of range - Circuit 3

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

About B0429

B0429 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 B0429 is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour.

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 B0429 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

DTC B0429 is a generic body code that indicates the HVAC control module has detected that the feedback signal from the rear temperature control circuit 3 is outside its expected voltage range. On vehicles with rear or third-zone climate control, this circuit feeds the position signal from the rear blend door actuator's internal potentiometer back to the climate module so that it can verify the door has reached the commanded position. The code sets when the feedback voltage is too high (typically near reference) or too low (typically near ground) for an extended period, indicating an open, shor...

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