OBD-II Fault Code

B2105: Throttle Position Input Out of Range Low

Meaning, symptoms, likely causes, diagnostic checks and repair guidance for B2105.

System family

Body

Generic/SAE

Repair category

Throttle / pedal sensor

Use this category to narrow your checks before replacing parts.

Severity

High

Severity is a general guide. Confirm with scan-tool data and vehicle symptoms.

What B2105 usually means

Throttle Position Input Out of Range Low.

Common symptoms

Body/accessory warning lamp or feature not working; Reduced power / limp mode possible; Hesitation or unstable idle

Likely causes

Dirty throttle body; Faulty throttle/pedal position sensor; Wiring/connector fault; Adaptation needed; Low signal voltage; Weak power supply; High resistance/poor ground; Failed sensor

Diagnostic checks

Check related fuses, connectors, grounds and switch/module power supply; Inspect throttle body and connector; Check sensor correlation data with scan tool; Check sensor reference voltage, ground and signal voltage

Repair guidance

Clean throttle body if appropriate, repair wiring, perform throttle relearn, replace failed sensor/body after testing; Repair poor ground/power feed or replace confirmed faulty sensor

Verification after repair

Operate the affected body/accessory system and rescan

Note: Confirm vehicle make/model/year because manufacturer-specific codes can vary. A DTC identifies a circuit or system condition, not always the failed part.