Code Definition

C1252 — Brake Booster Pump Motor ON Time Abnormally Long

System: Chassis  |  Type: Manufacturer-Specific  |  Make: Toyota

About C1252

C1252 is a manufacturer-specific chassis diagnostic trouble code recorded for Toyota vehicles. It belongs to the C-prefix family of codes, which covers chassis, braking, steering, suspension, or stability-control faults.

Scanning & clearing: Chassis (C) codes are stored in the ABS, traction control, or stability-control modules. An enhanced or OEM-level scan tool is usually required to read and clear them.

C1252 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

This code is set when the Skid Control ECU determines that the brake booster pump motor runs longer than expected to build or maintain hydraulic pressure. The pump supplies pressure to the brake actuator and accumulator in systems with an electronically controlled brake booster. If the motor operates continuously or for an excessive duration without reaching the target pressure, the ECU interprets this as a fault. When this code is set the brake, ABS, and VSC warning lights usually illuminate, the pump may run frequently, and brake assist can be reduced with a firmer pedal.

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