1998 Chevy Blazer hard shift and service engine light

CARCHRIS

MEMBER
1998 CHEVROLET BLAZER
6 CYL
FWD
AUTOMATIC
178,000 MILES

This happens occasionally not always.
My transmission does not shift smoothly but will shift hard. The service engine light comes on and this will make it fail emmisions. I had the local auto store reset the fault code and I was able to drive the 100 miles before I had the emissions tested so it did pass the emissions. I would like to sove the problem myself so that I can learn more about it and save the money. I do not have the fault code but I could have it reset again and get it.
Thanks for the help!

3 Replies

JACOBANDNICKOLAS

MECHANIC
108,230 POSTS

I need to know the code to help you identify what the problem was. However, if they reset the computer, the code is erased. Is it listed on the repair bill?

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Sunday, November 1st, 2009 AT 11:07 AM

CARCHRIS

MEMBER
2 POSTS

The fault code was p1870.

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Sunday, November 1st, 2009 AT 1:43 PM

JACOBANDNICKOLAS

MECHANIC
108,230 POSTS

PO1870 - Component slipping

Generally this code is set when TCC is commanded on and either it doesn't happen or the converter clutch does not hold. It will result in high line and very harsh shifts. Generally if you have a no lockup situation and do not set this code the issue is tuning related.

I hate to say it, but you will need to see a trans mechanic. It could be the converter. Does the overdrive still work properly?

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Sunday, November 1st, 2009 AT 8:10 PM