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.
Diagnostic Aids
Scan tester should indicate a vehicle speed whenever drive wheels are turning at speeds greater than 3 MPH. A faulty or misadjusted Park/Neutral switch can result in a false Code 24. Use scan tester to check for properly adjusted Park/Neutral switch in "D", "P", and "N". For additional information and testing of Park/Neutral switch, see ENGINE SENSORS & SWITCHES in I - SYS/COMP TESTS article in this section. If Code 24 is intermittent, see INTERMITTENTS in TESTS W/O CODES article in this section.
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.