Last post on Dec 09, 2013 at 7:21 AM
You are in the Buick Rendezvous
What is this discussion about?
Buick Rendezvous, SUV
#2046 of 2541 Re: 2003 Buick Rendezvous [kate29]
Aug 09, 2008 (2:50 pm)
Research the C-305 connection which causes problems such as yours. I believe it is located in the area under the driver's seat and beneath the carpet. Many problems have been caused by the wires in that connector not making good contact, corrosion, or the wires having pulled out of the connector.
The fuel pump circuit gets routed through this connection. I would also check your fuel pressure regulator to make sure that is not faulty.
Aug 09, 2008 (2:57 pm)
The following was copied from a Google search
Starting problems, various electrical gremlins. Drivers of some 200006 GM minivans (full list below) may come into your shop complaining of some really strange symptoms. Among the comments you might get is that the engine won't start, starts with difficulty or stalls. The starting troubles may be accompanied by an inoperative or out-of-whack fuel gauge. In addition, the MIL and the ABS and/or TCS warning lights may be illuminated. The TCS system may have a mind of its own, activating in dry conditions. Finally, Service Traction System and/or All-Wheel Drive Disable messages may be displayed on the dash. To put the icing on the cake, all these symptoms can come and go, leaving behind multiple DTCs in the process.
Veteran techs know that unrelated electrical gremlins like these usually have their origin in either one of two maladies: a bad ground or an intermittent connector. In this case, it's the latter-more specifically, connector C305. You can find this connector on the floor, just to the rear of the driver's seat. And what you'll probably see is that it's either corroded or has spread female terminals.
How you approach the repair depends on what you find. If the connector is corroded, water is getting into the vehicle from somewhere. Find and fix the leak first, then replace the connector. If there's no evidence of corrosion, GM warns not to try to repair the spread female terminals. Instead, replace them with parts from a terminal repair kit.
The following vehicles are susceptible to the starting and electrical problems described:
2000-04 Olds Silhouettes
2000-05 Chevy Ventures and Pontiac Montanas
2001-05 Pontiac Azteks
2002-06 Buick Rendezvous
2005-06 Buick Terrazas, Chevy Uplanders and Pontlac Montana SV6s
#2048 of 2541 inacurate gas guage
Aug 10, 2008 (2:15 pm)
I have a 2006 buick Rendezvous. The gas guage is very inacurate especially from 1/2 tank to empty. I have been to the dealer 5 times, 3 sending units, a cluster and a reprogram. Now they want to tell me this is normal. If so why did they throw all these parts at it. Anyone had this problem and get it fixed?
#2049 of 2541 Re: inacurate gas guage [ford_doc]
Aug 10, 2008 (3:14 pm)
I have a 2004....same problem. I noticed it when the vehicle was days old. TWICE, the dealer drained my tank and adjusted the mechanism that measures fuel levels. It was never fixed to my satisfaction. I gave up on it. The gauge shows low fuel when the vehicle is facing downhill, and just the opposite when facing up hill. I have owned many cars in my short life, and I have never seen this issue before. I guess have gotten used to it....I usually get 400 miles on one tank....that is my "accurate" gauge.
#2050 of 2541 Re: Fuel Gauge problems [cyurick]
Aug 19, 2008 (12:51 pm)
I have a 2005 RDV with the same problem and I have already had them replace the sensor and the instrument cluster which did no good. There is a tech. bulletin from GM on the 05',06 RDV's which states basically that there could be problems with the temp gauge and or the fuel gauge with erratic readings and there is no fix. It even says that the service people shouldn't replace the instrument cluster because that won't fix it. Buick says they are working on it but this has been a problem from 02' to 07' and unless more people complain and file suit, GM won't do anything about it. Look what it took for them to do something about the gaskets on the 2002's. Anyone who's car is still under warranty should seek justice through their state Lemon Laws. Because I bought my 05' used, even though it was still under warranty my state Lemon Law is unless. I would sure like to get a class action suit going
#2051 of 2541 Re: 2003 Buick Rendezvous 
Aug 26, 2008 (8:57 am)
I have a 2005 RDV and the only connector even close to this location isn't inside the vehicle but under it and the connector is water proof. I have exhaustedly searched for it inside with no luck. As I said there is one at that location under the car.
#2052 of 2541 Re: Fuel Gauge problems [ealford]
Aug 26, 2008 (9:13 am)
I have a 2004 and whenever I park on a hill, the gauge will read inaccuately...of course parked on a level surface the gauge reads fine....try parking your vehicle on a level surface...I think you're just looking for a problem when there is none. If the gauge does not right it self when level then you may have a problem....I have read many posts here and 80% are people who, A: don't take care of their vehicles, B: think the only thing you have to do is put gas in it and go....anything to bash American cars....no wonder our economy is in the "tank" (pun intended)
#2053 of 2541 Re: Fuel Gauge problems [chuckie2]
Aug 26, 2008 (9:25 am)
You obviously don't have a clue about what we are talking about in reference to the fuel gauge on the Buick RDV. I for one do all of my own maintenance on all of my vehicles including my 02' Dodge Ram Diesel and my 95' Harley. Did you not read my post about GM acknowledging the fact that there is a problem with the fuel gauge and they can't fix it? Get a grip Chuckie!!
#2054 of 2541 Re: Wheel Bearings Replaced [ajmthomas]
Aug 26, 2008 (11:41 am)
Is your RDV an AWD? I have this problem with my 2002 AWD, but I know what it is with my car. If you have an AWD it could likely be the rear axle. It's a German part that needs to be flushed and lubed about every 30k. It costs about 250.00 to do it and if you put it off apparently the thing will break at a cost of 3k to replace it. The kind of noise it will make is a whinning noise (like wawawawa) every time you make a wide turn left or right at slow speeds. My problem that I have with my RDV is the A/C isn't working, it just blows air. Also my window control on my driver side doesn't work, my rear view mirror leaked and now is foggy permanently, I forever have my check engine light on (emission issues) and some of my lights on my dash are out, such as my odometer. I have no idea what else could be wrong with my car and frankly I don't want to know because I don't have the money to pay for it anyhow.
#2055 of 2541 Re: 2003 Buick Rendezvous [ealford]
Aug 26, 2008 (2:51 pm)
The C-305 connector does transistion from the outside of the vehicle to the inside behind/under the drivers seat. The problems others have had is corrosion inside the connectors (even though it is "waterproof") or pulled wires which are not making a good connection. One owner has taken numerous pictures of how he repaired the connections, the damage he found when he first took it apart, etc.
If you live in an area of the country where you drive in snow and the resulting salt useage, you are more prone to have problems with this connector, or depending on the way it was built, problems with the pulled wires.