speed limited to 145K/h

jwanes · #1 (**permalink**) 02-14-07, 07:51 PM

I have had my 03 STS since Nov 2006. It has 35000Km (22000mi). A couple of weeks ago I took the car in for service at the dealer under warranty. They changed the intermediate steering shaft, rotated the wheels, changed the oil and filter, and the cabin air filter (all free). The following day as I was driving The message "speed limited to 145km/h" appeared on the DIC. it stayed for a few seconds and went away. since then this message has been intermittantly coming on and off. Sometimes it goes away for a few days, other times in comes on a number of times during a typical drive. I checked the codes and there was one code related to suspension, which was
RSS U1000 HISTORY (class 2 comm.). I cleared the codes and drove the car a few more days with the message appearing regularly, checked the codes again and no RSS codes. Just some TTM and MSM UXXXX history codes. On one occasion i also got RIM U1255 HISTORY which is also a comm malfunction code. What does the Rear Integration Module do?

I took the car to dealer yesterday to have it checked. They played with it for a few hours and gave it back to me. I hadn't gone a mile, the message came back. so I took it back and left it with them. This morning they called and told me they believe it's fixed. I picked the car up and again less than a mile of driving the message is there. What they had done is check all the RSS connections and upgrade the firmware in the modules. I don't have a report yet since the file is still open. So we agreed that I am going to drive the car for a few weeks and take it back and talk to the shop forman to see if we can make any headway. There is no ovbious drivability issue with the car. Only th eannoying message. I have taken it past 145Km/hr many times. Although the message was never on when I was driving at that speed.

Has anyone else experienced something like this with their STS?
Does anybody have any ideas as to what could be the problem?
Could it be related to the previous service? Sterring shaft and the wheel rotation?

Sorry for the long story but I wanted to give you the whole picture.

thu · #2 (**permalink**) 02-14-07, 11:25 PM

This normally comes up when there's something wrong with the suspension. In the States, we get the message "Speed limited to 90 MPH".

We have seen a number of members of this board get this message. You might want to do a search and see if anything you find helps.

jwanes · #3 (**permalink**) 02-15-07, 07:36 AM

I did a search and there were a number of other instances, but did not see one where there was frequently occurring messages with no codes. At this point even the dealer doesn't know what is the cause. I will post back once they figure out (hopefully) what the fix is in a few weeks.

Thanks

64FLH · #4 (**permalink**) 02-15-07, 04:15 PM

Check the fuse for the CVRSS module. The fuse for this is under the rear seat in a power distribution box. If you don't hear the compressor for the rear shocks cycle after starting the car, I'd check this fuse. It's a 10A fuse marked CVRSS. The power distribution box has 10A spares in it. A quick fix if it's this fuse. Reset your codes if this fuse has blown. There are postings on this board for this procedure.

jwanes · #5 (**permalink**) 02-15-07, 04:29 PM

Wouldn't the dealer check for that? If it was a fuse wouldn't it set a permanent DTC and DIC message?

yves · #6 (**permalink**) 02-15-07, 05:24 PM

yes, but soemtimes the fuse has a flicky connection. I had that with my interior light fuse. To change the fuse or check the fuse sits tigh and well is a good idea.

Murphyg · #7 (**permalink**) 02-15-07, 08:13 PM

Am goin with what Thu said. Bout the suspension.

But am curious that you said you have passed the 145 before with no issues.
You havent said wether or not your vehicle is speed rated.

If your vehicle is Z/W rated then it shouldnt come on at all.
But if it is speed rated and your still capable of exceding that limit, then might want to think bout wether or not you really want them to fix it.

Almost sounds as though someone was inside the computer and accidently fooked up.

jwanes · #8 (**permalink**) 02-15-07, 11:01 PM

Quote:

Originally Posted by Murphyg

Am goin with what Thu said. Bout the suspension.

But am curious that you said you have passed the 145 before with no issues.
You havent said wether or not your vehicle is speed rated.

If your vehicle is Z/W rated then it shouldnt come on at all.
But if it is speed rated and your still capable of exceding that limit, then might want to think bout wether or not you really want them to fix it.

Almost sounds as though someone was inside the computer and accidently fooked up.

Thanks murphyg for the input. I do realize that this message is related to the suspension, but it is intermittant, it comes on and stays anywhere from a couple to 10's of seconds, and there are no codes, and the dealer so far has not pin pointed the problem. My car has H rated tires which I believe is 210kph (130mph). I have taken the car up to 180kph (113mph) with no problems but at the time the message was not on. when the message is not displayed I believe the speed is not limited. when I do get the message on the highway and have the ability to get it up there safely, I will try and see if it cuts out. So far it's a mystery.

Raze · #9 (**permalink**) 02-16-07, 10:19 AM

It's related to your active suspension components. I had this happen and I looked it up in the FSM, in my case it's because my front suspension is failing, sometimes both struts set a code, if both do, then the speed limit is set as the shocks can no longer control active damping. When only one strut fails the speed limit is not set. I'm sure there are other ways this can happen but that's my experience.

jwanes · #10 (**permalink**) 02-16-07, 10:39 AM

what code did yours set? I don't have any codes. Also the car has only 35000km (22000mi) on it. It drives nice and firm so I do not believe there is a physical problem with the suspension.

Raze · #11 (**permalink**) 02-16-07, 10:44 AM

I was getting the codes for the front right and front left active suspension failure. If you're not getting a code, I have no idea what it could be, I'd check your fuses as has been mentioned. I really don't know without codes or reading the entire FSM where the problem might be...

samm · #12 (**permalink**) 02-16-07, 11:34 AM

too cold. looks like your from canada. depending on your conditions, the weather can affect the speed limiter. i also recieved this message with nothing wrong with my old 99 SLS a couple of winters back. at least that's what i blamed it on... but no, mine did not keep occuring like you say yours does.

jwanes · #13 (**permalink**) 02-16-07, 11:50 AM

Quote:

Originally Posted by samm

too cold. looks like your from canada. depending on your conditions, the weather can affect the speed limiter. i also recieved this message with nothing wrong with my old 99 SLS a couple of winters back. at least that's what i blamed it on... but no, mine did not keep occuring like you say yours does.

Samm, it does not appear to be temperature related, but thanks for the response. I was in MN and SD a couple of weeks ago and I was glad to return to the "warmth" of Toronto. It was -26F In SD and a little warmer in MN.

samm · #14 (**permalink**) 02-16-07, 12:05 PM

wow, warmer up there, huh? yeah, we've had quite the cold spell.

WarrenJ · #15 (**permalink**) 02-16-07, 01:17 PM

If your 2003 is like older Northstars, you can use the diagnostics to take a "snapshot" of the PCM at the instant of failure.

Your dealer can "play it back" later and examine all the PCM parameters at the moment of failure.

Might be helpful.

Regards,
Warren