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Chevrolet TrailBlazer, GMC Envoy, Buick Rainier, GMC Envoy XL, Isuzu Ascender, Oldsmobile Bravada, SUV
#11247 of 18329 Oil life reset revisited...
May 15, 2003 (8:31 am)
#9237 of 11246 GM Oil Life System™ -- resetting bulletin by tblazed Dec 17, 2002 (10:09 am)
Here's the exact text from the service bulletin how to do it, and how it is supposed to work.
Info - GM Oil Life System - Resetting #02-00-90-001
GM Oil Life System™ -- Resetting
2002 Chevrolet and GMC S/T Utility Models (TrailBlazer, Envoy),2002 Oldsmobile Bravada
These vehicles have an oil life monitor. The GM Oil Life System™ will show when to change the engine oil and oil filter. The GM Oil Life System™ must be reset after changing the engine oil and oil filter.
The current Owner's Manual contains the following reset procedure:
Turn the ignition to RUN with the engine off.
Fully press and release the accelerator pedal three times within five seconds. If the CHANGE ENG OIL light flashes for five seconds, the system is reset. If the light does not flash, repeat the procedure.
However, it has been found that after completing the reset procedure, the CHANGE ENG OIL light does not flash as stated in the vehicle Owner's Manual.
If the CHANGE ENG OIL light goes out after the reset procedure and does not return after the next ignition cycle, then the system has been reset.
If the vehicle is equipped with a Driver Information Center (DIC), then reset confirmation can also be done by verifying that the Engine Oil Life percentage value has reset to 100%.
Use the above information to prevent the inadvertent replacement of the instrument cluster if there are comments that the oil life reset feature does not work
#11248 of 18329 RE: Surge/Clunk
May 15, 2003 (8:41 am)
I have had this happening since day one. It always happens when the truck is cold, I drive a short ways and stop at a light. It actualy feels like the guy behind me tapped me when stopping. There is a clunk sound and a feeling of something moving under the truck. I have concluded that it is the transmission doing a hard shift from 2nd to first. The reason I think this is because:
I only drive a short ways out of the parking lot at work to the first light, enough to get it into 2nd but no more.
The truck is cold.
I am stopped for a while (sometime >1 min.) before the clunk happens.
It makes sense to me that the transmission would stay in 2nd at a stop when cold.
Shifting from 2nd to 1st could be rough when not moving or when the fluid in the torque converter is cold.
The computer realizes after a while that it needs to downshift because I have been stopped so long.
I once reported this to my service manager, but they said it was normal.
Please let us know if someone finds a defect that is causing this! Otherwise, I will try not to worry about it.
25k miles and otherwise running good (02 Envoy SLT)
#11249 of 18329 Re: Surge/Clunk
May 15, 2003 (8:53 am)
Thanks for the info lurker01.
Your experience sounds similar to ours. But ours has been getting worse and is driving me crazy.
I agree that it may be transmission related. But when my Envoy does the "clunk" (usually after stopped for over 30 seconds), I can stay stopped there and it sometimes will do it again.. or a 3rd time even.
And it's not something loose inside or outside the vehicle banging around. I wish I could reproduce the shutter/clunk at will so I could be outside the vehicle to witness it with the hood open.
I'm baffled. And as I said, GM admits they have widespread reports of this problem and they are working on a fix. I'll be calling every 2 weeks to kindly remind them.
What build date is yours?
(2003 Envoy SLT, build date 12/02, 3.73 gears). The new Envoy loaner that had the issue had a build date of 3/03.
#11250 of 18329 RE:Surge/Clunk by kram18
May 15, 2003 (9:28 am)
"I have noticed that when accelerating after a complete stop (like a stop sign or traffic light) there is a clunk..."
That's different than the noise others are hearing while stopped. Don't know but suggest checking the spare tire and make sure it's solidly pulled up against the bottom, check under the back seat and make sure the jack and all its pieces are secured, look in the rear floor compartment and in the rear storage compartment for something loose, and when all else fails take it to the dealer. From your description should be obvious. Maybe something loose in the suspension? Whatever, it shouldn't do that.
#11251 of 18329 Onstar false advertising
May 15, 2003 (9:43 am)
I have a Envoy for 2 years and love it. But on Monday night my wife's 2002 Escalade was stolen right out of our driveway. We had the car at a valet that night and suspect that somehow they were the culprits. We parked the car a 9:30PM on Monday and when my wife went to work on Tuesday morning at 6:30AM she discovered the car missing. We immediately called Onstar. First they wouldn't start tracking the car until they had a police report number. At 7:00AM I gave them the police report number. At 7:30 we got a call from Onstar and they were not having any success tracking the car. It is now Thursday and Onstar can not get a signal. If you have a alarm tracking system, it might be best not to advertise it. Onstar is doing us all a disservice by being so well known. I called the dealer and they said Onstar tracking has a separate battery and is placed somewhere on the frame of the car. These were obviously professionals, no broken glass, etc. My hope is that our insurance treats us fairly. My wife is upset, and wants to replace the car. I just feel we are sitting ducks. We live in the Los Angeles area. Onstar should reimburse us for something as I feel they are giving us a false sense of security and the thieves the heads up on which car has a tracking system. If the thieves know the car has Onstar they will learn how to disarm it. I hope GM learns from this and re designs the system.
#11252 of 18329 re: false advertising
May 15, 2003 (10:26 am)
It's the theives' fault, not OnStar's.
There is nothing false about their advertising at all. Somebody disabled the system. No technology is going to completely stop the professionals.
Yes it's unfortunate, but OnStar owes you nothing.
#11253 of 18329 RE: Surge/Clunk by lurker01
May 15, 2003 (10:34 am)
Definitely, I have experienced the exact same thing with my 02 Envoy SLT. Same scenario and I have also thought "whoa, did that person just tap my bumper". Like you, just happens, that I've noticed, within the first mile or so at the first extended stop. Have not mentioned this to the dealer....maybe I should?
May 15, 2003 (12:30 pm)
I had something similar. Within the first mile when stopped at a traffic light with a less than warmed up engine, the idle would mysteriously drop. Sometimes it would completely stall, other times it would recover and shudder or surge. No clunking though. It did this most often with a cold engine, but also when fully warmed up but not as frequently. Also, when stepping on the gas from a stop, the idle would drop then surge.
Made six trips to the dealer over 6 months for reprogramming, new PCM, throttle body, lift gate module, ignition switch replacements, and I still stalled out. We even had the vehicle data recorder installed, but that drained the battery overnight.
So 3 weeks ago GM completed the repurchase of my '02 Envoy SLT 2WD (build 6/01) with only 17K miles.
#11255 of 18329 Re: Surge/Clunk from day one
May 15, 2003 (12:50 pm)
I too have the clunk sound coming from my 02 TB LS 4x4. I learned how to make it happen. I accelerate at a decent rate then apply the brakes normally until the truck gets down to about 5mph. then I let off of the brake and hit the gas normal as if I was accelerating from a stop light. The clunk comes as soon as I hit the gas after braking.
I owned a 99 Jeep grand Cherokee prior to this and it had the same exact problem. IT IS THE DRIVE SHAFT! I believe it is the same in the TB. The Jeep dealer told me it was the drive shaft moving front to back. When you brake it moves towards the engine. Then when you give it gas, it slides in the spline and moves back causing clunk sound. I am almost positive that this is the problem with the TB.
Mine will be going in soon to get looked at. Jeep had two ways of fixing it. Grease up the drive shaft spline really good. or replace the drive shaft and assembly on it. I prefer the later of the two.
#11256 of 18329 re: Onstar
May 15, 2003 (1:01 pm)
A gesture of goodwill would be to absorb my deductible of $250. Do you understand my point? If the thieves know that Onstar is on board, it is not as "safe" as if you used a system in secret. Next time I will not depend on Onstar. And dependability is the issue. Having a system that is as well know as Onstar is not a deterrent.