Question about 1996 Pontiac Grand Am
A P1870 code is a General Motors code,and the definition on a scan tool,or diagnostic chart,is "Transmission Component Slipping"I've been rebuilding these units for many years.A slip code can be set in numerous ways,from clutch packs that simply have too much clearance,to a valvebody bore that is so severely worn,it needs reaming,and an oversized valve installed.All are internal problems that have to be addressed with a rebuild,and resetting of all clutch pack clearances,end play clearances, and bushing clearances.What will happen for your car in the near future is,it will start shifting hard,then harder and harder yet,because the computer is trying to overcompensate for the "slip" it is seeing.GM's system of measuring "slip",is shift timing.The vehicle computer monitors how long each upshift takes to complete,in tenths of seconds.If a shift,or multiple shifts start taking 8/10ths,9/10ths,over 1 second,on a consistent basis,the computer will set the P1870 code,illuminate the "check engine" or "srvce engine soon",and will also increase line pressure inside the trans.Whew.
Posted on Jul 09, 2008
a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Aug 19, 2017 | Honda Cars & Trucks
Feb 11, 2017 | Mitsubishi Colt Cars & Trucks
Aug 28, 2012 | 2007 Chevrolet Equinox LS New Cars
Jun 16, 2010 | 1999 Chevrolet Silverado 1500
Apr 22, 2010 | 2004 Dodge Stratus
Jan 07, 2010 | 1999 Chevrolet Astro
Mar 24, 2009 | 1996 Chevrolet Monte Carlo
Jan 17, 2009 | 2002 Isuzu Axiom
Feb 22, 2015 | 1996 Pontiac Grand Am
413 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: