What does code C1253 mean?

C1253: Brake Booster Pump Motor Circuit (Toyota)

Severity: high

What it means: The skid control ECU found a fault in the brake booster pump motor relay or circuit, for example the relay not switching as commanded.

Safe to drive? Use caution. The car usually still brakes, but pedal feel and stopping distance can change. Get it checked promptly, and stop driving if the pedal feels soft or travels further than usual.

Common symptoms

Brake, ABS and/or TRAC warning lights
Check VSC message
Brake pump running longer or louder than usual
Change in brake pedal feel

Likely causes, ranked

Pump motor relay faultShop
Wiring or connector faultShop
Failed brake booster pumpShop
Brake actuator faultShop

Vehicle-specific notes

What it means: The skid control ECU found a fault in the brake booster pump motor relay or circuit, for example the relay not switching as commanded.

Severity: High. Safe to drive? Use caution. The car usually still brakes, but pedal feel and stopping distance can change. Get it checked promptly, and stop driving if the pedal feels soft or travels further than usual.

DIY or shop?

Dealer or shop. Checking fuses and relays is DIY.

Vehicle notes

Toyota covers verified failures with these codes on certain hybrids, including 2013–2015 Avalon Hybrid, under customer support programs. Check your VIN with a dealer.

Before you replace parts

Read all stored codes, including detail (INF) codes on Toyota hybrids.
Check your VIN for recalls, service bulletins and extended coverage.
Clear the code only after a repair, then confirm it stays off.

Safety / mechanic note

Verify with a mechanic. Brake system faults affect stopping. A code points to a circuit or system, not always a specific part.