U1408
Implausible Brake Signal Received
U1408 is an OBD-II diagnostic trouble code meaning: Implausible Brake Signal Received. Common causes: malfunction of the brake pedal position sensor, damaged or corroded wiring harness. Estimated repair cost: $17–89.
Symptoms
- The CHECK ENGINE indicator light comes on.
- Incorrect operation of cruise control
- Problems with the ABS system
- Errors in other brake signal-dependent systems
- The vehicle may not recognize when the brake pedal is pressed.
Causes
- Malfunction of the brake pedal position sensor
- Damaged or corroded wiring harness
- Disconnected or oxidized connector contacts
- Problems with the ABS module or its software
- Mechanical damage to brake pedal elements
How to Fix
- Check the condition and operation of the brake pedal sensor
- Inspect the wiring harness and contacts for damage
- Clean connector contacts from oxidation
- Diagnose the ABS module and update the software if necessary
- Check the mechanical part of the brake pedal and fastenings
Related codes
FAQ
What does the U1408 code mean?
U1408 is an OBD-II diagnostic trouble code that indicates: Implausible Brake Signal Received
What causes a U1408 error code?
The most common causes of U1408 include: Malfunction of the brake pedal position sensor; Damaged or corroded wiring harness; Disconnected or oxidized connector contacts; Problems with the ABS module or its software.
How do I fix a U1408 diagnostic trouble code?
To fix U1408: Check the condition and operation of the brake pedal sensor. Inspect the wiring harness and contacts for damage. Clean connector contacts from oxidation. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U1408?
Limited driving only, diagnose soon
How much does it cost to fix U1408?
The estimated repair cost for U1408 is $17–89. Actual cost depends on your vehicle, location, and labor rates.
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