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.
2020 Subaru Ascent BaseFACTORY OEM SERVICE PROCEDURE
General Diagnostic Table: Inspection
| Symptoms | Possible cause | Corrective action |
|---|---|---|
| AT select lever | Starter does not run. | Adjust the select cable and inhibitor switch, or inspect the circuit. |
| Back-up light does not illuminate. | Adjust the select cable and inhibitor switch, or inspect the circuit. | |
| AT shift lock system does not operate normally. | Adjust the select cable and inhibitor switch, or inspect the circuit. | |
| Manual mode can not be set. | Inspect the mode switch and select lever, or inspect the circuit. | |
| Up-shift is not engaged at manual mode. | Check the shift-up switch and circuit. | |
| Down-shift is not engaged at manual mode. | Check the shift-down switch and circuit. |
Factory Service Tools
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.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.