Question about 1996 GMC Sierra
Lost Drive, and 3 gears on automatic transmission
Lost Anti-braking system non functional --- Trouble light on dash
Speedometer dead - tack still works Odometer dead
All this died at the same time during a road trip
No visible vacume line problems
No visible electrical connection problems
I dissconnected the positive terminal on the battery overnight to reset the electronics.
Do i need a new transmission, or what?
I am no expert here but it sounds like a computer problem, that much all at once. chk. all plugs that go into computer maybe ones loose or sliped out. Chk. all ground wires from body to engine, and chassey. some of the grounds you may have to go under truck to chk. It only takes one to screw things up.
Posted on Feb 06, 2009
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Posted on Jan 02, 2017
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Mar 15, 2014 | Cars & Trucks
Mar 08, 2014 | 1995 GMC Sierra C1500
following are the general instructions on the start of diagnosing any
electronically controlled engine or transmission problem.
engine and the automatic transmission (transmission control is only
for automatics, engine is still computer controlled no matter the
transmission type) in this vehicle are computer controlled and in
most cases when a fault occurs a fault code is stored in the memory
of the computer control module. There are exception to this, such as
the Mass Airflow Meter and fuel pressure problems. What must be done
is to have all the basic testing done such as a scan of the system
for fault codes as well as a check with a live data scanner tool for
engine functions that are not within range of normal, a trained
technician is required to know what is correct and what isn't, then
based on careful diagnostics done from a factory repair manual the
correct part is replaced or the wiring repaired or the computer
replaced (known as the PCM), which is very rarely the problem. Other
basic checks must be done as well such as mechanical problems with
the engine as well as engine state of tune and mileage on the engine.
The transmission can have mechanical issues as well such as no gear
engagement at all or a failed pump or other pressure related
problems. Also engine mechanical problems ca cause many
drive-ability related problem such as rough idle and other symptoms
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