The traction control light is on & it will not shift into 4th gear
SOURCE: 2001 cavalier codes
P0621 - indicates a failure in the alternator lamp curcuit.
P0304 - indicates a miss fire was detected in the #4 cylinder
U1040 - indicates a loss of communication with the ABS system
U1000 - Indicates a class 2 communication loss
None of those codes are relating to a transmission failure (P0700-P0702)
I would have a visual look at the transmission and verify that all electrical wires are connected and tight. Then I would have the transmission serviced if it hasn't been within the last 35,000 miles.
Have the trouble codes cleared and address the ones that return.
After that you may be looking at an internal transmission adjustment and/or repair.
Good luck.
SOURCE: 2001 chevy cavalier trac light
Might have a front wheel bearing going out take it to a shop they can hook up a computer and tell you which bearing it is
SOURCE: when the traction control light
sounds like your alternator is not giving out the correct voltage or isnt giving out any voltage. computers need the correct voltage to work properly. if your alternator is bad and your battery gets drained then that could make the computer give funny codes and make it run rough. the simple test is to unplug your positive battery cable after you start the car and see if the car still runs. if it does then the alternator is working. if you have a volt meter you can make sure that the alternator is giving out between 12 and 15 volts.
SOURCE: my 88 chevy with 700r4 wont upshift from 3rd to 4th
you have a valve body problem, some of the speed sonsor controls are malfunctioning... need to get into the valve body... check fluid condition for dirty and burned condition...
SOURCE: is the RPM gauge and the transmission connected
Anti lock brakes and traction controls will light if there is too much tire pressure differential. That mean a low tire turns more rpm in a mile than a full tire so it constantly thinks it is slipping in either /both taking off or braking... Tire pressure is important. Check it!
... If you turn the system off by moving the shift lever
to FIRST (1) or SECOND (2), the warning light will
come on and stay on. To turn the system back on,
move the shift lever back to a position other than
FIRST (1) or SECOND (2). The warning light
should go off. (See "Enhanced Traction System"
in the Index for more information.)
The warning light will come on when you set your
parking brake with the engine running, and it will
stay on if your parking brake doesn't release fully.
If the transaxle shift lever is in any position other
than FIRST (1) or SECOND (2) and the warning
light stays on after your parking brake is fully
released, it means there's a problem with the system.
If the traction control system is affected by an
engine-related problem, the system will turn off
and the warning light will come on.
If the Enhanced Traction System warning light comes
on and stays on for an extended period of time when the
transaxle shift lever is in any position other than FIRST
(1) or SECOND (2) your vehicle needs service.
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