What Does B1483 Mean?
This code indicates the Body Control Module (BCM) or brake system control module has detected an abnormal signal or loss of signal from the brake pedal position switch or sensor circuit. The system monitors brake pedal input for functions like brake lights, cruise control deactivation, transmission shift interlock, and electronic stability control. A circuit failure means the module cannot reliably determine when the brake pedal is pressed or released.
Safety Warning
This is a critical safety issue as brake lights may not function properly, increasing rear-end collision risk. Cruise control, shift interlock, and stability control systems may also be affected. Repair immediately and avoid driving until resolved.
Common Causes
45%
Faulty brake pedal position switch or sensor
30%
Damaged or corroded wiring/connectors in brake pedal switch circuit
15%
Misadjusted or improperly installed brake pedal switch
10%
BCM or control module internal fault
Diagnostic Steps
1
Step 1: Perform visual inspection of brake pedal switch location above brake pedal arm, checking for physical damage, proper mounting, correct adjustment, and secure connector attachment
2
Step 2: Using a digital multimeter, backprobe the brake switch connector with ignition on and verify voltage supply (typically 12V) at the input terminal, then test for continuity changes when manually pressing and releasing the brake pedal
3
Step 3: Inspect wiring harness from brake switch to BCM/control module for chafing, pinching, corrosion, or damaged insulation, paying special attention to areas where harness passes through firewall or along steering column
4
Step 4: Using scan tool live data, monitor brake pedal input signal status while cycling brake pedal to confirm BCM receives proper ON/OFF signals corresponding to pedal movement
5
Step 5: If switch and wiring test normal but code persists, perform resistance check on switch ground circuit and verify proper ground connection at BCM mounting points
6
Step 6: Clear codes, perform test drive with multiple brake applications, and verify repair by confirming code does not return and all brake-dependent systems function properly
Estimated Repair Cost
$75 - $350
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) or brake system control module has detected an abnormal signal or loss of signal from the brake pedal position switch or sensor circuit. The system monitors brake pedal input for functions like brake lights, cruise control deactivation, transmission ...
The most common cause of B1483 (Brake Pedal Input Circuit Failure) is: Faulty brake pedal position switch or sensor
Typical repair costs for B1483 range from $75 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This is a critical safety issue as brake lights may not function properly, increasing rear-end collision risk. Cruise control, shift interlock, and stability control systems may also be affected. Repair immediately and avoid driving until resolved.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1483 to identify the root cause.
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Quick Info
Category
Body
System
Brake System / Body Control
Difficulty
Type
Manufacturer
Recommended Tools
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