Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Code 38, Code 41, Code 42: ESB Does Not Hold Motor: Notes
Expansion Spring Brakes (ESB) are used on front and rear actuator motors. ESB is a mechanical clutch that prevents modulator piston from being back-driven by hydraulic pressure. If motor is back-driven, ABS operation will be disabled and ABS light will illuminate.
Code will set if ESB does not hold motor. This code can set during initialization, or if associated hydraulic channel did not reach Anti-Lock Brake System (ABS).
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.