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C0640: Brake Pressure Sensor J Range/Performance

Severity
High
System
Chassis
Last reviewed: Last updated:

Methodology: We combine code standards with complaint and reliability patterns, then review for clear, vehicle-first diagnosis steps.

Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).

Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.

What Does C0640 Mean?

C0640 is a diagnostic trouble code indicating: Brake Pressure Sensor J Range/Performance. This code relates to the chassis system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of C0640

Common Causes

Frequently Asked Questions

What does C0640 mean?
C0640 indicates: Brake Pressure Sensor J Range/Performance. The vehicle's computer has detected that the Brake Pressure Sensor J is not operating within its expected parameters and stored this diagnostic trouble code.
Can I drive with code C0640?
Only short distances if absolutely necessary. C0640 affects a critical system and should be diagnosed within a few days to avoid further damage.
How much does it cost to fix C0640?
Repair costs for C0640 typically range from $50 to $400, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

  • 🔧 Inspect and clean Brake Pressure Sensor J
  • 🔧 Replace degraded Brake Pressure Sensor J
  • 🔧 Check for related mechanical issues affecting readings
  1. 1
    Find your vehicle above

    Click your make and model for real owner reports and common causes specific to your vehicle.

  2. 2
    Check for recalls

    Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.

  3. 3
    Get a professional diagnosis

    A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

Related Codes

C0600 4WD/AWD Range Actuator Position Control Error C0601 Active Air Dam Control Circuit/Open C0602 Active Air Dam Control Circuit Low C0603 Active Air Dam Control Circuit High C0604 Active Air Dam Control Circuit Performance C0605 Steering Wheel Angle Sensor Circuit/Open C0606 Steering Wheel Angle Sensor Circuit Low C0607 Steering Wheel Angle Sensor Circuit High C0608 Steering Wheel Angle Sensor Circuit Performance C0609 Park Brake Switch Circuit