2003 gmc envoy u1000 code & code p0014

SOURCE: Check Engine Light On - 2003 Chevy Blazer

hi the engine check is letting u know that a component on your engine has failed the computer stores this information is stored in the computer memory u need to go to a garage and say u want the fault codes checked they have a scanner to do this it could be a faulty part or just a bad connection hope it helps your mechanic should know this he must be a bush mechanic good luc mate

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: engine reset light on 2003 gmc envoy

The service engine light you refer to is telling you you have a problem with the computerrized engine control of the car.When the light comes the computer stores a numerical code that can be retrieved with a scan tool or code reader.If you are not experienced with diagnostics you need to take the car to a mechanic,because sometimes a code can fool you and you can change a good part.An example of this would be reading a code that the oxygen sensor is reading a lean condition setting the light on. but the real issue is a bad fuel pump not supplying enough fuel to the engine. On the code alone you would be inclined to change the sensor when it was not the problem.

SOURCE: 2003 chevy suburban keeps dying

Check Fuel filter change if it hasn,t been changein a while also check fuel pump relay may be bad (clicking on and off )therefore shutting pump down. If all is well with above items. then the camshaft position(this provides reference for injector pulse) sensor may be at fault. Good Luck, contact if you need more help.

SOURCE: rough idle / engine surges until power is applied

Sounds like a possible vaccume hose leak?