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 55, Controller Fault
ABS module performs a self check for the following: ability of controller to execute valid instructions, Random Access Memory (RAM) integrity, Read Only Memory (ROM) integrity, and microprocessor wheel speed circuitry. If problem is detected, ABS operation will be disabled and ABS light will illuminate.
If Code 82 is also set, recalibrate ABS module. If only Code 55 is set, replace ABS module.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.
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