C0637 — Brake Pressure Sensor G Circuit Low

What Does C0637 Mean?

C0637 is a diagnostic trouble code indicating: Brake Pressure Sensor G Circuit Low. This code relates to the chassis system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of C0637

⚠️ Check Engine Light (MIL) illuminated
⚠️ Brake Pressure Sensor G reading at zero or minimum value
⚠️ Related system not functioning or in fail-safe mode
⚠️ ABS or stability control warning light

Common Causes

🔍 Open or broken wire in Brake Pressure Sensor G circuit
🔍 Poor ground connection at Brake Pressure Sensor G
🔍 Faulty Brake Pressure Sensor G with no output signal
🔍 Disconnected or loose Brake Pressure Sensor G connector
🔍 Blown fuse in related circuit

Frequently Asked Questions

What does C0637 mean?

C0637 indicates: Brake Pressure Sensor G Circuit Low. The vehicle's computer has detected that the Brake Pressure Sensor G is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code C0637?

Only short distances if absolutely necessary. C0637 affects a critical system and should be diagnosed within a few days to avoid further damage.

How much does it cost to fix C0637?

Repair costs for C0637 typically range from $20 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

🔧 Repair broken wire or restore ground in Brake Pressure Sensor G circuit
🔧 Clean and secure Brake Pressure Sensor G connector and ground points
🔧 Replace failed Brake Pressure Sensor G

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

C0637: Brake Pressure Sensor G Circuit Low