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
Code will set when an unknown gear ratio is detected for any gear but 4th. Check all connections, especially those at the transmission pass-thru connector. If code is intermittent, see INTERMITTENTS in appropriate TESTS W/O CODES article in this section. See below. Compare scan tester gear ratio reading to specifications in GEAR RATIO SPECIFICATIONS .
| Gear | Less Than | More Than |
|---|---|---|
| 1st | 12.38 | 22.63 |
| 2nd | 11.43 | 21.58 |
| 3rd | 1.95 | 21.05 |
| Reverse | 11.97 | 22.17 |
NO RELATED
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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.