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Transmission not shifting properly

Tiny
PILLARD1
  • MEMBER
  • 2017 CHEVROLET TRAX
  • 1.4L
  • 4 CYL
  • TURBO
  • 2WD
  • AUTOMATIC
  • 60,000 MILES
1. When putting in drive, it pauses before it drops into gear.
2. Engine revs up between shifts.

dealer says it is caused by needing spark plugs. No misfire codes.
Thursday, December 30th, 2021 AT 3:41 AM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
I'm not sure how the transmission shifting as described is caused by spark plugs.

Have you checked the transmission fluid level and condition? It sounds as if the fluid is low. Also, the spark plugs are iridium, and shouldn't be bad yet. They are getting close, but I believe GM indicates changing them at 100,000.

I attached the directions for checking the transmission fluid below. Do this and let me know the results.

Take care,

Joe

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Thursday, December 30th, 2021 AT 6:30 PM
Tiny
PILLARD1
  • MEMBER
  • 4 POSTS
Fluid has been replaced. Troubles started after a bad turbo code was exhibited and a dealership replaced the turbo. Supposedly, they left a hose off or something and it started the transmission trouble at that time. They said the transmission issue was connected to the turbo issue and fixed the turbo issue. However, it did not fix the transmission issue. They gave up. That was maybe six months ago. The issues are getting worse, so my daughter took it to another dealership who gave her the spark plug diagnosis. I have lost all faith in dealerships. It appears that they have dismissed their highly qualified mechanics for newbies who will work for a lot less pay and do not have the training specific to the manufacturer. I have noticed this myself over a period of the last four or five years concerning several different vehicles of different makes.
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Friday, December 31st, 2021 AT 3:26 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

I have to agree with you. Things are changing. Over 41 years in the business, many things have changed and have presented new challenges. However, I never (in 41 years) heard of a transmission issue being caused by spark plugs that are not causing a misfire. Actually, even if they were causing a misfire, I don't see how it would cause this.

Based on the description and symptoms, I suspect it has something to do with transmission line pressure. In the transmission, there is a transmission fluid pressure switch, pressure solenoid, and several other electrical components.

Not being there does make it a bit more difficult, but based on the delayed engagement, the first thing I would check would be line pressure. If it is low, it would cause delayed engagement and delayed shifts.

If you want to see what's involved, I attached the diagnostics below for your review.

Let me know what I can do to help.

Take care and Happy New Year,

Joe

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Friday, December 31st, 2021 AT 8:59 PM

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