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 Parameters
Code 27 sets if left rear wheel speed changes by greater than 10 MPH (16 km/h) in 8 milliseconds. This code can be set any time vehicle is moving and not in ABS braking. Code 27 may be set together with Code 23. Drive vehicle faster than 30 MPH (48 km/h) to check for reappearance of failure.
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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.