I am having a problem with my '96 GMC Sierra SLE with a 5.7 L engine . The transmission works great in all forward gears but it is very erratic when put into reverse . P0306 , P0430 , P1351 and P1870 were the engine codes . Any advice or suggestions would be greatly appreciated .
Trouble Code Definitions
1996 GMC Sierra SLE
- Thread starter zoot
- Start date
You have 3 engine running codes that need fixed.
Remember a engine has to be running good for the transmission to work good.
Define erratic in a little more detail.
How many miles on transmission?
What transmission? 4L60E or 4L80E?
Have you had it on a transmission capable scanner?
Any slipping or delay on up shifts on scanner reading?
Remember a engine has to be running good for the transmission to work good.
Define erratic in a little more detail.
How many miles on transmission?
What transmission? 4L60E or 4L80E?
Have you had it on a transmission capable scanner?
Any slipping or delay on up shifts on scanner reading?
I'll let you know later today which transmission that i have . By erratic I mean it's about a 50-50 chance that reverse will engage or not . I'm on my way back to the shop to correct the engine codes . Apparently I have a cylinder miss on bank 2 , # 6 cylinder . I understand that I need to correct the engine issues and only then start with my transmission issues . I do appreciate your counsel as I am in no way anything more than a shade tree mechanic at best . I can change parts , but I leave the diagnosis to people that actually know what they are doing . Again , whatever the outcome , thanks .
There are roughly 35,000 or so miles on the transmission . It is a 4L60-E . I'll get it scanned as soon as possible . It has shuddered before upon going up a hill , but it hasn't appeared to slip or shudder any other time and certainly hasn't since I changed the filter and fluid .