Lexus · Known Issues

2014 Lexus IS Problems: 1 Known Issue

2014 model year · 2,100+ owner reports · Updated September 2026

According to Au7o's analysis of 2,100+ owner reports, the 2014 Lexus IS has 1 documented issue. None of the listed issues is rated critical; this is not a complete reliability assessment. The most commonly reported issue is 8-Speed Automatic Harsh Shifting with 2,100 owner reports. DIY maintenance guides at au7o.io.

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All 1 Known Issue

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Community reported

2,100 owners

On the 2014-2020 Lexus IS, the Aisin 8-speed automatic transmission in the third-generation IS exhibits harsh or jerky shifts, particularly during low-speed 1-2 and 2-3 upshifts and when downshifting for deceleration. The transmission control module programming prioritizes fuel economy over smoothness, leading to abrupt gear changes that are felt prominently in the cabin.

This issue also affects: Lexus ES, Lexus GS, Lexus RX

Common Symptoms

Hard jerk during 1-2 upshift at low speed
Harsh downshift when decelerating
Clunking sensation during gear changes
Transmission hesitation when accelerating from a stop

How to Fix

Visit the dealer for a transmission ECU reprogramming that smooths shift points and torque converter lockup behavior. Perform a transmission fluid drain-and-fill with Toyota WS fluid every 40,000 miles. If harsh shifting persists after the reflash, the valve body may need replacement.

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What you need to fix it

Only diagnosis- and fitment-reviewed repair parts are linked here.

00289-ATFWS genuine Toyota Automatic Transmission Fluid WS
OEM00289-ATFWS
Supply genuine Toyota WS fluid for a procedure-confirmed drain-and-fill branch Fitment/availability: Live in-stock product page identifies genuine Toyota ATF WS, part 00289-ATFWS, sold individually. Confirm the installed Lexus transmissi…
TEQSport

As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

Owner tips & cautions

TipA fluid drain-and-fill with genuine Toyota WS ATF makes a noticeable difference in shift quality. Do not flush — just drain and refill 4-5 quarts.

Research This Issue

Based on 2,100 owner reports

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Community Reported

Medium Confidence2,100 owner reportsLast reported by owners Dec 2025Reviewed Mar 23, 2026

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Other Lexus Models

Lexus NX18 Lexus ES16 Lexus GS15 Lexus RX14 Lexus UX13 Lexus LX8

Frequently Asked Questions

What are the most common Lexus IS problems?

According to Au7o's analysis of 2,100+ owner reports, the 2014 Lexus IS has 1 documented issue. The documented issue is: 8-Speed Automatic Harsh Shifting. None are rated critical, but regular maintenance is recommended.

Is the Lexus IS reliable?

The 2014 Lexus IS has 1 known issue documented across 2,100+ owner reports. None of the matching records is rated critical; this is not a complete reliability assessment. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

What is the 2014-2020 Lexus IS 8-Speed Automatic Harsh Shifting?

The Aisin 8-speed automatic transmission in the third-generation IS exhibits harsh or jerky shifts, particularly during low-speed 1-2 and 2-3 upshifts and when downshifting for deceleration. The transmission control module programming prioritizes fuel economy over smoothness, lea… Severity: medium.

Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.