Question about 1998 Pontiac Grand Am

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P1870 Code//Transmission Question

Okay, before i bought this car it has always kicked from 1st gear - 2nd gear decently hard. But now almost a year after buying the car and driving it, i get a P1870 code. The owner before me already had the transmission rebuilt right before i bought it.. so the transmission is about a year old. Went to AAMCO and they want me to rebuild AGAIN! i'm not rebuilding my transmission over a dumb code. What does this code usually have to do with, i know it means Transmission Component Slippage, but what in specific could be wrong? and how much would it cost to fix?

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  • Samuel Ward Aug 16, 2008

    I havent replaced the fluid or the filter.

    But the code is already cleared. Its been 1-2 weeks since cleared, the CEL hasn't come back.

    But it still kicks hard from 1-2 shift :|

    Is there a fix for this?

  • Samuel Ward Aug 16, 2008

    Fluid & Filter are still good. - UPDATE

  • Samuel Ward Aug 17, 2008

    Well, it kicks 3-4 also. But, not as much. I think its a pressure problem. The trouble code came on when i was going 60-70 MPH on the highway. So i dont know what it could be, but if the CEL comes back on it wastes my gas like alottttt. So there has to be a fix to it.

  • Samuel Ward Aug 17, 2008

    ok thanks :] much appreciated.



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Have you had the fluid and filter changed, it could be that simple
try the simple stuff first "ya...know"
after changing it clear the code and see if it comes back.
i have come across this in mid to late '90 model gm's

Posted on Aug 16, 2008

  • kristopher betzler
    kristopher betzler Aug 16, 2008

    well the only thing if the fluid and filter is good, my guess would be shift solenoid ...which is a internal part normally they don't pose a threat of damage don't stress it is more annoying than any thing.
    the trouble code will come back eventually.....but don't wory your car will continue to drive.

  • kristopher betzler
    kristopher betzler Aug 17, 2008

    let me do some reading on it and i'll get back to you might be your trans' ECM but i'll look in to it.



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I recently ran into this same problem. My truck has 125,000 miles. The service engine light would come on from time to time. I did as you and got a P1870 code.

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Probable causes
  1. Towing a trailer.
  2. Transmission fluid level.
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In my particular case a fluid and filter change solved the problem. I do plan on dropping by the trans shop and let them do a complete service in the near future. (Fluid, filter, band adjust, and check pressure)

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