It has sat up about 2 month's
SOURCE: where is my 1 2 shift sensor 2000 gmc jimmy
Inside trans. pan at the rear of the valve body. They have a wire clip which holds them in.
SOURCE: firing order for gmc jimmy 1999
-Drivers side starting at the front of engine: 1-3-5
-Passenger side starting at fornt of engine: 2-4-6
SOURCE: 1999 gmc jimmy 151k miles code 0452, emmissions help
THIS IS A FUEL TANK PRESSURE SENSOR CODE. MOST LIKELY THE SENSOR ITSELF IS BAD BUT CHECK THE WIRING AND THE ECM.
SOURCE: my 2000 gmc jimmy seems to have problems shifting
1-2 shift is delayed and harsh, may not shift into OD: Check Throttle Position Sensor (TPS) for smooth and linear electrical response over the entire range of motion. If not, replace.
This is one of the things i can think of that would cause the issue you gave me. Start with that since it's simple and the other thing to is you can try resetting the ECM.
Turn the ignition key to the run position (engine not running) and pull the ECM fuse out for 30 seconds. Place fuse back in and start the engine, the engine may stall but let it. The ECM is relearning the engine and transmission and then go for a test drive after idling for 1min. The transmission my be running back good as new, if not. Have the TPS checked if not replaced. Good luck and keep me posted.
SOURCE: where is the shift solenoid
The shift solenoids are inside the tranny, just pull the pan and the filter and you will have a 20 lb piece of metal with a million slots cut in it called the valve body, in it contains, 2 shift solenoids and one lock up thing and one other electric thing, I would have to peek in the book for that one. But you can access this easy enough, your tranny will drip for days while you work on it, and the solenoid might not fix the problem. But a filter and partial oil change will help. Check it out, hope this helps.
I had the same problem with my 1999 Silverado which would blink several times on the mode I selected then go back to the 2 wheel High. I found the switch module to be defective, after replacing it I have never had the problem again.
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