C05AA: ABS Pump Motor Temperature Too High

ABS pump motor temperature exceeded safe limit — typically after extended ABS activity or stuck rotor.

Symptoms

• ABS warning light on
• ESC/stability control deactivated
• Possible reduced brake assist
• Speedometer may behave erratically

Most likely causes

• Thermal overload from extended use

What to check, in order

Start with the simplest. You can tick off each step.

1. Check that the brakes respond normally and check the fluid level
2. Check the sensor's ground and make sure the signal wire is not receiving voltage from another circuit.
3. Read the ABS codes with a multi-system scanner
4. Check the wheel sensors, connectors, and wiring
5. Compare the speeds of all four wheels in live data
6. Leave any work on the hydraulic circuit to a professional

Good to know

• Repair difficulty: medium
• It can trigger limp mode.

What each character of C05AA means

• C: Chassis
• 0: Generic code: same on every make
• 5: Subsystem depends on the code range
• AA: Specific fault in that system

Frequently asked questions

Can I keep driving with code C05AA?

The regular brakes usually keep working, but without ABS or the driver aids. Drive very carefully and go to a repair shop; if the pedal feel changes, do not keep driving.

What causes code C05AA?

The most common causes are: thermal overload from extended use.

Sources

• github.com: dtc database
• en.wikipedia.org: Anti lock braking system

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.