Why does my Toyota Yaris iA steering wheel shake at highway speed?

Short answer: A steering wheel shake at 70-75 mph on a Yaris iA is usually wheel balance. Ask for a road-force balance, check for a missing wheel weight and have the lug nuts torqued evenly. A trunk that won't latch after a bump usually needs the striker realigned.

Symptom: The steering wheel shakes at highway speeds, or the trunk lid won't stay closed after a minor rear bump.

What to check first

1. Run your VIN at nhtsa.gov/recalls.
2. Look on each wheel rim for a clean spot where a weight used to be.
3. Ask for a road-force balance, not just a standard spin balance.
4. Have the lug nuts torqued to spec by hand with a torque wrench.
5. Look at the trunk striker. If it's bent or shifted, it needs adjusting.

Likely causes

1. Tire and wheel out of balance. A lost wheel weight or a tire that's out of round makes the steering wheel shake at highway speed.
2. Uneven lug nut torque. Lug nuts tightened unevenly, often with an impact gun, can warp how the wheel sits and cause shaking.
3. Trunk latch striker knocked out of place. The U-shaped striker the latch grabs onto can be pushed out of line by a bump to the rear.

What it usually costs

Owners in these threads didn't post prices.

Is it safe to keep driving?

Mild vibration is usually safe to drive on for a short time, but get it checked. A trunk that won't latch can fly open, so tie it down until fixed.

DIY or shop?

Checking lug nut torque is DIY. Road-force balancing and striker adjustment after a bump are shop jobs.

Recalls, bulletins and complaints in plain words

• Recalls: NHTSA's recall lookup returned no data for the Toyota Yaris iA for 2 model-year queries on 2026-10-29, so we couldn't confirm recalls here. Check your VIN at nhtsa.gov/recalls. If your car is part of a recall, the dealer fixes it for free.
• Plain words: The complaint count below shows how often owners reported problems that mention these words to NHTSA. A count is not proof of a defect.
• NHTSA complaints: 14 keyword-matched complaints for Toyota Yaris iA (2017-2018 queried) 2017–2018 (of 39 unique complaints queried, NHTSA complaints API by model year, queried 2026-10-29; keywords: vibrat, shake, wheel, tire, trunk, latch) (NHTSA returned no data for 2 model-year queries). This counts complaints that mention these words. It is not a defect finding.

What owners report

• In Vibrations in 2018 Toyota Yaris iA on Car Talk, a 2018 Yaris iA's steering wheel vibrated at 70-75 mph. Members suggested a road-force balance, checking for a lost wheel weight and checking lug nut torque, and noted balancing is often covered only for the first 12 months or 12,000 miles.
• In Toyota Yaris iA 2018 Trunk Latch on Car Talk, a 2018 Yaris iA's trunk wouldn't latch after a low-speed bump. Members said the striker (the U-bolt the latch catches) likely needs adjusting and suggested a body shop estimate.

Quick tip

If you just had tires done and it shakes now, go back to that shop first. A lost weight or uneven lug nuts is the usual cause.

Vehicle focus: Toyota Yaris iA sedan (sold as the Scion iA in 2016 and the Yaris sedan in 2019-2020), built by Mazda.

Safety / mechanic note

Wheels and tires are safety items. Verify with a mechanic.