The new Proton Iriz is a very likable car, no doubt about it. We found that it rides and drives beautifully in our full review last month, but there’s no denying that the CVT automatic gearbox’s sub-standard behaviour somewhat spoils the overall appeal of the new B-segment hatchback.
Proton is well aware of this issue, of course, and has since issued a new transmission control unit (TCU) update to improve the CVT’s performance. The software remap is said to result in better throttle response, as well as a more linear and predictable feel (when pulling off from a standstill, especially).
The improvements have already been applied to all Iriz models delivered to customers so far. The fix doesn’t involve any mechanical changes – as it’s just a simple TCU re-flash – so presumably it won’t help with the CVT whine.
We will try to get our hands on an updated test unit soon, and will report on the new differences – if there are any, that is. In the meantime, if you’ve taken delivery of a Proton Iriz with a CVT gearbox, do tell us how it performs in the comments section below.
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AI-generated Summary ✨
Comments express a mix of hope and frustration regarding Proton Iriz's TCU remap and CVT performance, with many noting significant improvements in throttle response and smoothness after the update. Some still criticize the gearbox, build quality, and low road presence. A common sentiment is cautious optimism, with several commenters waiting to see long-term reliability. Overall, there’s appreciation for Proton’s quick response but skepticism about overall durability, along with disappointment over limited Iriz sightings on the road.