Code Definition

B2105 — Throttle Position Input Out of Range Low

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

About B2105

B2105 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 B2105 is stored, the module has detected a signal or supply voltage lower than the expected operating range; and 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 B2105 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) on some vehicles monitors the throttle position sensor signal as part of cruise control, traction control, or convenience system inputs. DTC B2105 is set when the BCM detects that the throttle position input voltage is below the calibrated minimum value, indicating an out of range low condition. This typically occurs when the signal voltage falls below approximately 0.2V when the closed throttle voltage should be near 0.5V. The fault may be caused by an open or shorted signal wire, a faulty throttle position sensor, or loss of the 5V reference voltage. When this c...

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