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Apr 30, 2013, 9:13 AM

Post #1 of 2 (1120 views)
p1870 Sign In

1999 chevy 2500 van give a P1870 transmission component slipping code.What does this mean and what do I look for?

Ultimate Carjunky / Moderator
Discretesignals profile image

May 1, 2013, 4:46 AM

Post #2 of 2 (1066 views)
Re: p1870 Sign In

Which transmission do you have? 4L60E or 4L80E?

Basically what is happening is the engine speed isn't matching what the output shaft speed is when the transmission is in 3rd gear with the torque converter clutch locked up or if the torque converter slip speed is excessive when locked up in 4th gear.

The computer thinks the transmission is slipping and sets that code. This can be caused by a component slipping in the transmission, torque converter clutch slipping, Slipping components can have their own cause too, such as solenoid issues, hydraulic circuit problems, etc. It is important that not only the effect is repaired by the cause it determined and repaired too, so the problem doesn't reoccur.

You should swing into a transmission shop and have it diagnosed to find out what the cause is.

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on May 1, 2013, 4:53 AM)

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