Code
B1483
Other
B — Body
Brake Pedal Input Circuit Failure
AI status
Completed
Completed
100%
Causes
- Faulty brake pedal switch (mechanical or electrical failure)
- Brake pedal position sensor (potentiometer or Hall sensor) failure
- Open or short in signal wiring (chafing, pinched, rodent damage)
- Corroded or loose connector at the pedal switch or control module
- Blown fuse or poor power/ground to the brake switch circuit
- Faulty body/control module (BCM/ECM) input circuitry or software
Symptoms
- Brake warning light, ABS or traction control warning lamps illuminated
- Brake lights inoperative or stuck on
- Cruise control disabled or unavailable
- Transmission shift-interlock or start-interlock issues (vehicle-specific)
- Reduced or altered regenerative braking in hybrids/EVs
- Stored B1483 code and possibly related codes
What to check
- Connect a scan tool: read B1483, related codes, and freeze-frame/live data for brake pedal input
- Visually inspect brake pedal switch/sensor and mounting for damage or misalignment
- Inspect wiring harness and connector for corrosion, bent pins, broken wires, or chafing
- Verify fuses and power/ground for the brake switch circuit
- Operate the pedal while observing live data or a test light/multimeter to confirm signal change
- Wiggle harness while monitoring for intermittent faults
Signal parameters
- Vehicle battery voltage supply to switch: ~12 V (verify presence)
- Switch output: open/closed contact (0 V or battery voltage) OR
- Sensor output (analog): typical 0–5 V range varying with pedal travel
- Signal continuity (closed) when pedal depressed for switch-type circuits
- CAN/lin message: brake pedal position or brake switch status (message present and changing when pedal moved)
Diagnostic algorithm
- Record freeze-frame and related codes with a scan tool. Note whether fault is current or historic and any DTC counts.
- Perform a visual inspection of the pedal switch, sensor, connector, and wiring harness for damage, corrosion, or loose terminals.
- Verify power and ground at the brake switch connector with ignition ON. Replace blown fuses before further testing.
- With ignition ON, monitor the brake switch/sensor signal with a multimeter or oscilloscope while operating the pedal: confirm expected voltage/continuity changes.
- If the signal is intermittent, perform a wiggle test on the harness and connectors while monitoring signal; repair any wiring faults.
- If switch/sensor shows no output but has correct supply, unplug and bench-test or substitute a known-good switch to confirm failure.
- Check the receiving module input (BCM/ECM). If wiring and switch are good but module input is inactive, verify module grounds and communications; consider module swap only after full verification.
- Repair or replace confirmed faulty components (switch, wiring, connector pins, fuse, module) and secure harness routing to prevent recurrence.
- Clear codes, retest the system over multiple key cycles and a short road test to ensure the fault does not return.
- Safety note: Do not perform tests that expose you to moving components or that allow the vehicle to be driven with known brake-control faults.
Likely causes
- Brake light / pedal switch failed or misadjusted
- Damaged wiring harness at the pedal bulkhead or firewall
- Connector corrosion or poor terminal contact
- Loss of 12V supply or ground to the switch
- Intermittent fault caused by harness movement when pedal is operated
- Faulty module input (less common)
Fault status
Status
Brake Pedal Input Circuit Failure — input signal open/short/out-of-range or lost communication detected.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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