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.
Transmission Does Not Shift (A/T)
2010 Acura TL FWD V6-3.5LSECTION Transmission Does Not Shift (A/T)
Transmission does not shift
Input shaft (mainshaft) speed sensor defective
Output shaft (countershaft) speed sensor defective
Engine output low
Notes
Check the speed sensor installation.
Notes
Inspect the input shaft (mainshaft) speed sensor or the output shaft (countershaft) speed sensor O-ring for wear and damage.
Notes
Check for exhaust restrictions.
Notes
Check for intake restrictions.
Notes
Check fuel pressure Testing and Inspection.
RENDER: 1.0x
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.