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Chevrolet Impala, Sedan
Sep 21, 2004 (8:30 pm)
Bulletin No.: 02-07-30-013A
Date: February 03, 2004
Incorrect Transmission Shifts, Poor Performance of Engine, Transmission Slipping, SES Lamp Illuminated, DTC P0730, P0756, P0757, (Clean Transaxle Valve Body and Case Oil Passages of Debris)
2001-2004 Buick Century, LeSabre, Park Avenue, Regal
2002 - 2004 Buick Rendezvous
2001 Chevrolet Lumina
2001-2004 Chevrolet Impala, Monte Carlo, Venture
2001-2002 Oldsmobile Aurora, Intrigue
2001 - 2004 Oldsmobile Silhouette
2001-2004 Pontiac Aztek, Bonneville, Grand Prix, Montana
with 4T65E Transmission (RPOs M15, MN3, MN7, M76)
This Bulletin is being revised to include additional model years and additional diagnostic information. Please discard Corporate Bulletin # 02-07-30-013 (Section 07 - Transmission/Transaxle).
Some owners may comment on any one or more of the following conditions:
^ The SES lamp is illuminated.
^ The transmission slips.
^ The transmission does not shift correctly, is very difficult to get the vehicle to start moving or the engine lacks the power to move the vehicle.
The most likely cause of the various conditions may be chips or debris:
^ On 2001 - 2002 vehicles, a plugged orifice on the case side of the spacer plate.
^ ON 2003 - 2004 vehicles, restricted movement of the 2-3 shift valves in the valve body.
^ On 2003 - 2004 vehicles, restricted movement of the 3-4 shift valves in the valve body.
Bulletin No.: 01-07-30-038B
Date: January 26, 2004
DTC P0757 Set, SES Lamp Illuminated, Poor Performance of Transmission, Transmission Slipping (Clean Transmission Valve Body and Case Oil Passages of Debris)
1999-2004 Passenger Cars and Light Duty Trucks
2003-2004 HUMMER H2
with 4L60-E/4L65-E Automatic Transmission (RPOs M30/M32)
This bulletin is being revised to add model years and change Cause and Correction information. Please discard Corporate Bulletin Number 01-07-30-038A (Section 07 - Transmission/Transaxle).
Some customers may comment on any of the following conditions:
^ The SES lamp is illuminated.
^ No 3rd and 4th gear.
^ The transmission does not shift correctly.
^ The transmission feels like it shifts to Neutral or a loss of drive occurs.
The vehicle free wheels above 48 km/h (30 mph). High RPM needed to overcome the free wheeling.
The most likely cause is chips or debris plugging the bleed orifice of the 2-3 shift solenoid (367). This will cause the transmission to stay in 2nd gear when 3rd gear is commanded and return to 1st gear when 4th gear is commanded.
DTC P0757 may also be set if the 2-3 shift valve (368) or 2-3 shuttle valve (369) were stuck, restricted and/or hung-up in its bore.
Bulletin No.: 01-07-30-014
Date: April, 2001
4T65-E Transmission Delayed Shifts, Slips, Flares or Extended Shifts During Cold Operation (Replace Shift Solenoid Valve Assembly)
2001 Buick Century, LeSabre, Park Avenue, Regal
2001 Chevrolet Impala, Lumina, Monte Carlo, Venture
2001 Oldsmobile Aurora, Intrigue, Silhouette
2001 Pontiac Aztek, Bonneville, Grand Prix, Montana
with 4T65-E Automatic Transmission (RP0s MN3, MN7, M76, M15)
Some owners may comment on one or several delayed shifts, slips, flares or extended shifts during cold operation. These symptoms can affect the 1-2 shift only. The transmission won't shift out of 1st gear until the temperature is high enough to unstick the solenoid. This condition can last up to several shift patterns. These symptoms can return after the vehicle sits, usually 6 hours or more.
The 1-2, 3-4 shift solenoid valve not exhausting may be the cause of these conditions.
Replace the 1-2, 3-4 shift solenoid valve. Refer to the appropriate Service Manual information for replacement procedure.
#978 of 2014 Re: Driver's window switch saga [chevyman12]
Sep 22, 2004 (6:34 am)
The next morning while stuck in traffic, I called my Chevy dealer, and they had the part in stock for $80+ dollars. I had them hold it for me and picked it up at lunch; it came out right at $90 with tax - I installed it in the parking lot in about 5 minutes. I don't know what the dealer would have charged to install the part, but all you need it a proper sized Torx wrench (or in my case, a broken pocket knife); everything else just snaps into place.
#979 of 2014 DRL disable on 2001 Impala
Sep 26, 2004 (3:52 pm)
Has anyone figured out a way to disable the DRL on a 2001 Impala? I am not convinced they are the safety feature they claim and I live out in the desert where visiblity is great and if it isn't I know where the light switch is! Can anyone help me disable these things? I took out the DRL Relay but that didn't work. I really want to be able to get rid of these things. Anyone can email me at: theemancitlink.net if they don't want to post here. Thanks!
Sep 26, 2004 (8:13 pm)
The DRLs are not for your visibility, but for others coming toward you.
They help make YOU visible.
Yes, they are a safety item and as such, if you are in an area of DEQ inspections, they may fail you on a safety item, such as DRLs not working.
Disabling them is not easy. You would have to rewire the entire headlight system, as they are part of the lighting system and are controlled by the body control module, which controls just about everything.
If you want to get rid of them, I would suggest you buy a different vehicle that doesn't offer them as an option. Good luck in that.
I've done alot of repairs on vehicles that folks have tried to disable the DRLs (especially GM vehicles), only to destroy something that renders the headlights totally inoperative. Usually, trying to do something like that only costs you headaches and money.
#981 of 2014 Re: Security warning [hatethiscar]
Sep 27, 2004 (3:50 am)
I'm going back to my mechanic with what I think is the same problem this AM. [2001 Impala] Mine has finally gotten bad enough that it is consistent -- ambient temp reaches 79-80 degrees & the car won't start-- no crank.
If I am driving when the car reaches the critical temp, then the 'security', 'service engine soon' and 'battery'[alternator?] lights rotate through on the dash. [it also loses the air conditioning and radio]
Yesterday I drove it 3 hours on the thruway & the ambient temp reached 76 -- no problem. Parked it in my driveway in the shade-- unloaded the car -- everything fine. Then my wife took it for a short trip- parked in the sun & it triggered the problem within an hour.
It kicks in at 79 degrees or so [according to the thermometer on the DIC], but the ambient temp has to get down to mid sixties before it goes away. [slamming the trunk seems to alter something but it isn't consistent enough to say for sure]
My mechanic changed ignition switch last week-- that wasn't the problem.
Today I'm taking it back to him & I'm going to use a hair dryer to heat up various components until we can trigger it.
#982 of 2014 Re: Transmission Problem [isabella]
Sep 27, 2004 (8:16 am)
Our 2001 chev impala died this morning also...we had problems earlier this month, and were suggested to flush the trani and put a new filter in. Did so, and drove fine yesterday, still had the clunking to shift every once in a while, and the irritating hum in the motor when pushing on the gas. We have took it in twice once to certified transmitions, and then to a regular family mechanic, nothing showed on the computer scans, nothing came up or triggered. I know the feeling of sick of the price. Our Chevy Impala has 93354 miles on it, and came from the Chev dealership here and had one previous owner which was a insurance company who bought it from the dealership. I love this car, but hate the problems that I seem to have tripped upon on other message boards. Everything I read seems to be coming true with this year of Impala...Called Chevy asking if there were any recalls or problems...what a joke...
#983 of 2014 Replacing Mass Air Flow Sensor
Sep 30, 2004 (7:50 am)
Does anyone know if installing a new Mass Air Flow Sensor requires reflashing the PCM on a 2000 Impala? The car has the 3.8 and was producing a trouble code of P0102. I thought it was a MAF, took it to a mechanic who agrees it's the MAF, but he suggested I take the car to a dealer because the PCM may have to be reflashed after the new MAF is installed.
#985 of 2014 Re: theeman, [0patience]
Oct 03, 2004 (5:32 pm)
Thank you for your comment. Yes, we discovered that you are probably right about the rewire. Two competent mechanics just spent all day trying to figure out how to disable them without luck.
As for the "safety" that is totally bogus based on a study from Sweden and Canada where it is dark 9 months out of the year. They are simply trying to save a buck on a wiring harness because Canada passed a law (where it is also dark 9 months out of the year) for DRL's. Check out this site:http://www.lightsout.org/story.html