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 25, Code 26, Code 27 Or Code 28: Wheel Speed Acceleration Fault: Notes
Each wheel speed sensor generates a signal which is proportional to wheel speed. When ABS module detects speed signal change greater than 10 MPH while vehicle is moving, it disables Anti-Lock Brake System (ABS) and illuminates ABS light.
Code will set if wheel speed signal changes by greater than 10 MPH in 8 milliseconds. This code can be set any time vehicle is moving and not in ABS braking. Code 25/26/27/28 may be set together with Code 21/22/23/24. Drive vehicle faster than 40 MPH to check for reappearance of failure.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
No obligation. See pricing before you book.