Parts for your 2015 Subaru Impreza-Starter motor

2015 Subaru Impreza starter motor: what it does and how to look after it

Based on technical references including the Subaru Factory Service Manual for the 2015 Impreza (Starting/Charging System—Starter) and Subaru’s genuine parts catalogue for FB20-powered models, the 2015 Subaru Impreza is fitted with a conventional 12‑volt starter motor. These documents outline starter removal/installation procedures, wiring diagrams, and a listed starter assembly, confirming the part is relevant to this vehicle. Models equipped with Auto Stop‑Start still use a strengthened starter and suitable battery to handle more frequent restarts.

The starter motor’s job is simple but critical: it spins the engine fast enough for the FB20 to fire up. When the key is turned or the start button is pressed, the solenoid pushes the pinion into the flywheel/flexplate ring gear and the motor cranks the engine. Once running, the pinion retracts and the alternator takes over. Without a healthy starter, even a fresh battery won’t get the car going.

As part of regular servicing, it’s smart to keep an eye on the starting system. Quick checks go a long way:

• Battery health: ensure correct spec (AGM is often used with Stop‑Start), clean terminals, and solid earth straps.
• Listen for symptoms: single click (solenoid), slow crank (voltage drop or worn motor), grinding (pinion or ring gear wear), or intermittent hot no‑start.
• Electrical checks: inspect the starter relay, look for corrosion on the main cable at the starter, and consider a voltage‑drop test across the positive and earth paths.

When replacement is needed, quality matters. An OE unit or a reputable remanufactured starter usually delivers the right fit and cranking speed. Typical steps involve disconnecting the negative battery lead, accessing the starter at the bellhousing, removing the mounting bolts and electrical connections, swapping in the new unit, and torquing to spec. Shims are generally not used on these engines, but cable routing and heat shielding should go back exactly as found.

After fitting, verify clean engagement (no grinding), check charge voltage, and run a quick scan for any stored faults. For cars with Auto Stop‑Start, confirm the battery type and system calibration meet spec, otherwise the new starter can be overworked. A competent DIYer can handle the job with the right tools, but many owners prefer a workshop to test the whole starting and charging system in one go.

Popular questions about 2015 Subaru Impreza starter motors

Does a 2015 Subaru Impreza have a starter motor?
Yes. Technical references such as the Subaru Factory Service Manual (Starting/Charging System—Starter) and Subaru’s parts catalogue list the starter assembly, wiring, and procedures for removal/installation on 2015 FB20 models. Even versions with Auto Stop‑Start rely on a reinforced starter to manage frequent restarts.

How long does the starter motor typically last?
There’s no fixed interval, but many last well beyond 150,000 km when the battery and cables are kept in top nick. Stop‑Start vehicles may see more starter cycles, so battery condition and correct spec are crucial to longevity.

How can one tell if the starter is failing versus a flat battery?
A flat battery usually gives slow, laboured cranking and dim lights all round. A failing starter can present as a single click with good dash brightness, grinding noises, or intermittent no‑crank when hot. A load test on the battery and a voltage‑drop test to the starter helps pinpoint the culprit.