OBD-II Fault Code

B1988: Pedal Position Forward Switch Circuit Short to Battery

Meaning, symptoms, likely causes, diagnostic checks and repair guidance for B1988.

System family

Body

Manufacturer-specific

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 B1988 usually means

Pedal Position Forward Switch Circuit Short to Battery.

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; Wire shorted to power feed; Incorrectly repaired harness; Internal component short

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 for unwanted voltage on signal/control circuit

Repair guidance

Clean throttle body if appropriate, repair wiring, perform throttle relearn, replace failed sensor/body after testing; Repair harness short to power or replace internally shorted component

Verification after repair

Operate the affected body/accessory system and rescan

Note: Confirm vehicle make/model/year because manufacturer-specific codes can vary; Manufacturer-specific: confirm definition and test steps in the vehicle service manual. A DTC identifies a circuit or system condition, not always the failed part.