Replacement of the engine-driven alternator responsible for charging the 12V battery and powering the vehicle's electrical systems.
Reviewed by SubaruReview Editorial Team · Last reviewed 2026-05-15 · Editorial standards
How this repair stacks up against the other common Subaru electrical jobs — useful when you're sequencing what to fix first.
| Repair | Cost range | Labor | Parts | DIY |
|---|---|---|---|---|
| Subaru Alternator Replacement Cost (this page) | $550–$1,150 | 0.8–1.5 hrs | $400–$850 | 2/5 |
| Subaru Starter Replacement Cost | $450–$1,250 | 1–2.5 hrs | $250–$850 | 3/5 |
| Subaru AC Compressor Replacement Cost | $950–$1,850 | 2–3.5 hrs | $600–$1100 | 4/5 |
| Subaru EyeSight Recalibration Cost | $250–$750 | 1.5–3.5 hrs | $0–$0 | No |
| Subaru A/C Compressor Replacement Cost | $1,100–$1,800 | 4–6 hrs | $400–$800 | No |
| Subaru EVAP Canister Replacement Cost | $350–$650 | 2–3 hrs | $150–$300 | 3/5 |
This repair is part of our Subaru repair-cost database and complements the reliability & common problems hub. Cross-check the underlying failure before you book the job.
Internal diode failure or worn carbon brushes prevent current flow. On FB25 and FA20/24 engines, oil leaks from the front cam carrier or o-rings can drip directly into the alternator, causing premature electrical shorting.
The vehicle will eventually rely solely on the battery. Once the battery drains, the engine will stall, power steering will fail, and you will be stranded. Prolonged driving on a failing alternator can also 'cook' and ruin a brand new battery.
Expect $550–$1,150 at most US shops, parts plus labor.
0.8–1.5 labor hours typically.
Yes — DIY difficulty 2/5.
The vehicle will eventually rely solely on the battery. Once the battery drains, the engine will stall, power steering will fail, and you will be stranded. Prolonged driving on a failing alternator can also 'cook' and ruin a brand new battery.
Cost, labor-hour, and parts-price ranges on this page are aggregated national-average estimates. Individual figures are not tied to a single primary source and should be treated as directional — request a written quote from a Subaru dealer or an independent Subaru specialist before booking work. See our editorial standards for how we build these ranges.
No primary source is currently cited for the specific figures on this page. Treat quantitative details as directional pending verification — see our Corrections Policy to help us update it.
Independent Subaru specialists usually come in $300–$1,000 below dealer pricing on the $550–$1,150 range shown above, without giving up OEM parts. See real quote breakdowns in the Subaru repair-costs hub.
The most common trigger is AC Compressor Failure, documented with symptoms, root cause, and a permanent-fix path. Fixing the underlying failure first is what stops you from paying for this job twice.
Bundling electrical work at one visit almost always beats paying labor twice. Owners on this platform also price out Subaru Starter Replacement Cost and Subaru AC Compressor Replacement Cost at the same appointment.
Yes — we rate it 2/5. Follow the job-steps checklist above and the money-saving tips, and cross-check the reliability hub for related failures worth inspecting while you're in there.
It's tracked inside our Engine Guides cluster alongside every related failure and fix. Browse all topic hubs to see repair cost in the context of the underlying engine or drivetrain issue.
Dig into the Problems Database to plan your next maintenance sprint, or browse every model hub for buyer's guides, generation breakdowns, and known-issue lists.