2003 Rendezvous cx problem - GM Forum - Buick, Cadillac, Olds, GMC & Pontiac chat


Buick When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made.

Reply
 
 
 
Thread Tools Search this Thread
Old 09-23-2014, 04:51 PM   #1  
Junior Member
Thread Starter
 
Join Date: Jul 2014
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
nbul94 is on a distinguished road
Default 2003 Rendezvous cx problem

I am having a starting problem. Most of the time it will fire on the first crank, sputter and die, the second crank it will start right up. Other times is will crank and crank with no fire, but if i spray a little carb cleaner in the intake it will fire up and run perfect. I have 50 psi fuel pressure, and the regulator has been replaced, and the fuel filter. I believe it to be a security problem as the light has come on a few times. I read the codes and here is what it gave.

BCM codes: U1016, U1040, B2961.

Powertrain codes: P1626, U1040, U1064, U1300.

I have done some searching and found the key switch is common and the bcm but i dont want the throw parts at it. I'm seeing if any one has experienced this at all? Thanks
nbul94 is offline   Reply With Quote
Old 09-23-2014, 05:45 PM   #2  
Senior Administrator



Certified Car Nut
 
Join Date: Jul 2003
Location: Dark Side, NY
Posts: 16,027
Thanked 1,141 Times in 870 Posts
Mike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond repute
Default

50 psi may not be enough to make it run. Some V6'* need about 43, some others 55+

But, you have 2 U codes thats saying the PCM can't talk to the BCM and the BCM can't talk to the PCM. Both of them are reporting this. So it seems like we have a bad link between the 2 modules. And probably the best way to test this is to get to a dealer that has a Tech2 diagnostic tool that can "talk" to every single module in the car.
__________________
2002 S10 V8
Please do NOT PM technical questions
Please do not reply to posts older than 6 months
Mike is online now   Reply With Quote
Old 09-24-2014, 10:37 AM   #3  
Junior Member
Thread Starter
 
Join Date: Jul 2014
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
nbul94 is on a distinguished road
Default

I have a snap on scanner where I can see all live data of both modules, and turn off really anything I want to. Can tech 2 do more then this?
nbul94 is offline   Reply With Quote
Old 09-24-2014, 07:23 PM   #4  
Senior Administrator



Certified Car Nut
 
Join Date: Jul 2003
Location: Dark Side, NY
Posts: 16,027
Thanked 1,141 Times in 870 Posts
Mike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond repute
Default

Of course the Tech2 can do more. Its designed to be the highest diagnostic tool for GM vehicles. Its the only one that can reprogram GM modules, stereos, PCM'* BCM'*, etc etc.
__________________
2002 S10 V8
Please do NOT PM technical questions
Please do not reply to posts older than 6 months
Mike is online now   Reply With Quote
Old 09-24-2014, 10:25 PM   #5  
Senior Member

True Car Nut
 
Tech II's Avatar
 
Join Date: Feb 2014
Location: Worcester, Ma.
Posts: 2,503
Thanked 947 Times in 727 Posts
Tech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond repute
Default

If the vehicle cranks over, the PCM is getting a signal from the PassKey III module......thus it grounds the starter relay, and the fuel pump relay......I am not sure if the PCM receives the fuel enable signal from the PK3 moduel or the BCM....

The fact it starts, with a shot of carb cleaner, may mean the fuel pressure is borderline as Mike has suggested....maybe some one can look up the fuel pressure specs....

B2961 and P1626 have to do with the theft deterrent system......what you are going to have to do, is clear the codes and when the vehicle won't start, recheck to see which codes may have returned......comm codes are hard to diagnose, especially if intermittent....
Tech II is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
2007 rendezvous fuel pump access panel? johnnyu Buick 2 05-18-2015 09:32 PM
2005 rendezvous perplexing!! csmith161 Buick 4 05-16-2015 08:34 PM
2003 buick rendezvous steph197755 Buick 3 12-29-2011 06:32 PM
Instrument Cluster Problem..02 Rendezvous gosox Buick 3 01-13-2011 04:15 PM
Rendezvous? redwingsfan34 Lounge 13 08-08-2007 06:27 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 09:33 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.