Code P-1870 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 05-08-2006, 11:38 AM   #1
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Default Code P-1870

Its related to the trans, and might have something to do with power to the trans. Thats all I know. I cleared it and the next 5-min drive it hasnt come back. Im going to keep an eye on it, but any input from anyone before I jump to rebuliding the trans?

Thanks guys!

EDIT: I should probably say, there was no noticeable reason it came on. I was driving about 70mph on the highway, looked down and saw it flash on. Car did not jolt, or rev, the light just came on. I have tightned the bolts on the battery since I stopped.
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Old 05-08-2006, 11:50 AM   #2
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DTC P1870 Transmission Component Slipping

Garb...check fluid level and if burnt.

Might be time for a filter/fluid service.
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Old 05-08-2006, 12:20 PM   #3
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I was hopin someone would say that. I dont know off hand what it should exactly look like. What should be warning signs?
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Old 05-08-2006, 12:23 PM   #4
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Check your slip rpm'* with the TCC locked up at 55mph and cruise control set.

But check that fluid like the other Bill says. It should be pink, and of the proper level. Check it HOT after driving.

Sometimes friction material can settle a few minutes after driving, making you think your fluid looks fine.
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Old 05-08-2006, 12:40 PM   #5
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Quote:
Originally Posted by willwren
Check your slip rpm'* with the TCC locked up at 55mph and cruise control set.
Take that out of gearhead speak please! :P
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Old 05-08-2006, 12:46 PM   #6
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Scantool. TCC slip RPM'* data line. Checking for TCC slip while driving is the only way to know. Should be about 10 rpm'*, no more.

While in OD at 55mph with the cruise set (level road, no uphill/downhill).

If you don't have a scantool, or even if you do, check that fluid for color/smell/level after warming up/driving.
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Old 05-08-2006, 02:13 PM   #7
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Quote:
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Quote:
Originally Posted by willwren
Check your slip rpm'* with the TCC locked up at 55mph and cruise control set.
Take that out of gearhead speak please! :P
Come and visit me. I'll give you a hand.
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Old 05-08-2006, 02:20 PM   #8
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No scantool for me. I got the code from an Autozone scantool. Im gonna go out in a lil while and Ill check the fluid then.
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Old 05-09-2006, 08:29 AM   #9
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Ok so the fluid wasnt quite right. Im gonna get a change ASAP. Drove around a while yesterday and light never came back on, so it may have just been a fluke.
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Old 05-09-2006, 08:50 AM   #10
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Define 'not quite right'?
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