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Collision Prevention Assist Plus Inoperative Error
Anyone ever run into the attached two error messages while driving?
This occurred as the family and I were on the freeway exit ramp yesterday. The car at first seemed to drive OK and then by the time I got close to my destination it seemed to also lose engine power as I had to mash the pedal down to the floor in order to get the car to start moving (perhaps the emergency brake or brakes in general were auto engaging?). We decided to grab a bite to eat at the restaurant we stopped at, came back out, and the car started and ran just fine the rest of the day.
Seems like it may have just been a computer glitch. Just not sure if this is something I should take it to the dealer for or not. I don't want something like this to happen on an upcoming road trip we have and then to get stranded in the middle of the desert...
a lot of times these radar systems (collision prevention assist, blind spot assist, distronic...) get interference from external radar transmitters on the same frequency and make them act up intermittently. i wouldn't worry about it unless it happens frequently.
That's not something that should happen, especially with the loss of power. The prudent thing to do would be to schedule a trip to the dealer to see if an error code was recorded.
Error code comes on, engine has a delay in acceleration... it makes it feel like it lost power.
The only time the dealer was able to pull the codes was when I had the error occur and I drove straight to the dealer without shutting down the car. If the car restarts everything goes back to normal.
Now, they've since did some fix, and the problem hasn't come back. My SA mentioned they cleaned some connectors because there were paint overspray over them. I've attached the SO here. Let me know what your dealer says, I'm interested to find out.
cant speak towards the error, but is your traction control also lit up?
drifting with the family? lol
Lol, no. Traction control light came on at the same time the message popped up, never pushed a single button.
Originally Posted by l3it3r
When in park, it'll show that message.
Nope, this was while going about 65mph exiting the freeway that it occurred. I took the photos after I got to a safe spot and could put the car in park.
Error code comes on, engine has a delay in acceleration... it makes it feel like it lost power.
The only time the dealer was able to pull the codes was when I had the error occur and I drove straight to the dealer without shutting down the car. If the car restarts everything goes back to normal.
Now, they've since did some fix, and the problem hasn't come back. My SA mentioned they cleaned some connectors because there were paint overspray over them. I've attached the SO here. Let me know what your dealer says, I'm interested to find out.
Interesting. Sounds like I will have to wait for it to happen again though as it's been turned on and off several times since getting the message initially. I was initially going to bring it straight the the dealership but the service department closes at 1pm on Saturdays and had way to many things going on that afternoon to try and rush over there and just hope they had a last minute loaner handy.
This also happened to me , but it happened to me after I was hit to the side. The same message popped up saying that the vehicle is inoperable and at the same time the ABS kicked in which made me drift my way back home
I suggest that you should go have your car checked out, you don't want this to suddenly come back while you are on a highway
I had my car in at the dealership on Monday for a separate issue and let them know about these error messages as well. They did some investigation and couldn't replicate the issue but did find an error code. They did a software update and began doing some more research on the issue. As it turns out there is a service bulletin out there for this and it is due to something rubbing onto a wiring harness for the collision prevention assist system. They apparently have a fix for the issue, however that part is nowhere to be found except at the production facility and the only cars getting that part are the ones on the assembly line at this time. They even called Germany and they don't have any parts there to ship over either. They did out in an order for the part but couldn't tell me when it would be in stock. The dealership did say that they took a look at the photos of the fix and basically created their own fix for it in house and applied that to my car in the mean time.
I definitely appreciated the effort that the dealership went through but find it is a bit odd that some of the parts couldn't have been set aside for any existing cars that run into the issue could be fixed in a timely manner.
Guess it's not fixed as the system failed me again while going 75mph on the freeway. Lost the engine power and had to pull over to the shoulder to turn the car completely off and then back on again to rest the system. Had I need to do any sort of emergency maneuver when it failed I would have been screwed as pressing the gas was getting me nowhere. Guess it's back to the dealership in a couple of days...
Guess it's not fixed as the system failed me again while going 75mph on the freeway. Lost the engine power and had to pull over to the shoulder to turn the car completely off and then back on again to rest the system. Had I need to do any sort of emergency maneuver when it failed I would have been screwed as pressing the gas was getting me nowhere. Guess it's back to the dealership in a couple of days...
Could you perhaps post the repair order that shows the technicians story including the bulletin number if it's written in there?
I had this same problem and it has been resolved by the dealer. They had to order a part from Germany called a "connector" for the computer. It took 3 days to receive the part.
I had this same problem and it has been resolved by the dealer. They had to order a part from Germany called a "connector" for the computer. It took 3 days to receive the part.
We'll see if my dealership can get it right the second time around.
We'll see if my dealership can get it right the second time around.
Dealership had the car for three days and couldn't determine the cause. The computer didn to log an error codes for when the issue occurred last Saturday so nothing was done.
Today I had just pulled into a parking lot and just as I was about to park the system failed once again on me. I couldn't take it to the dealership at the time as I had my daughter with me and she needed to eat shortly and I had no bottles with me. Went and ran my errand, came back, and of course the errors cleared after the car was shut off and turned back on.
This issue is getting pretty ****ing annoying at this point as its a weekly occurrence now. Between this and other little things here and there I am very close to just getting rid of this car already....
Yeah it sucks. The only way for them to pull any faults is if you don't restart the car and drive it there in that state. I'm guessing it's the same cause as mine. They cleaned up some connector and said there were some paint over spray from the factory or something. Wasn't really detailed well on my workorder. I'm going in tomorrow to get my seat belt rattle fixed. I'll ask if they had any other complaints on this issue.
Originally Posted by chicagofan00
Dealership had the car for three days and couldn't determine the cause. The computer didn to log an error codes for when the issue occurred last Saturday so nothing was done.
Today I had just pulled into a parking lot and just as I was about to park the system failed once again on me. I couldn't take it to the dealership at the time as I had my daughter with me and she needed to eat shortly and I had no bottles with me. Went and ran my errand, came back, and of course the errors cleared after the car was shut off and turned back on.
This issue is getting pretty ****ing annoying at this point as its a weekly occurrence now. Between this and other little things here and there I am very close to just getting rid of this car already....
This exact same thing happened to me, but I was in stop-and-go traffic on the highway at the time.
I did notice that if I flipped into Sport or Sport+ mode, acceleration seemed proper though the light remained on with the subsystems "inoperative". Flipping back to Comfort mode returned it to horribly sluggish, like a five second acceleration delay. So I drove home in Sport and took it to the dealer the next day.
They're booked solid and it's Father's Day weekend and I have a bunch of driving I need to do; so I'm scheduled to have it all looked at this coming Wednesday. Will post a followup once I find out more.
2015 C400, ~6500 miles
Edit: I should've noted that, just like with the others, everything reset fine after turning the car off and back on again.
Okay, got the car back after a week. The short of it is that they saw the codes but couldn't reproduce the issue; so they did what tests they could, updated the software, and we'll just have to see if the issue has ironed itself out. I'll set myself a reminder to post again in a month if it doesn't misbehave.
From work order:
performed short test found codes u0416fd, u0401fe, and c10c800. performed guided test checked pin fit from connector F on m.e. to accelerator pedal, all pin fit is good. r&r front left carpet to inspect wire harness for damage as per guided test, no damage found. connected battery charger and performed software updates and scn coding on the following control modules transmission, motor electronics, electronic stability program, control unit powertrain, and fuel pump. cleared codes and had qc tech road test several miles, check out good at this time.
It has been a month without the issue repeating itself. If I have the problem again, I'll update. Otherwise, assume it's all good or I have a different car at that point.
Called MB USA no help.
Had C63, E63 and ML350 never any serious issues.
Traded my C300 for Lexus rx450h.
Here are the notes from Park Place MB in Dallas, was repaired 5 TIMES in 1 yr. I know lemon law, but MB is hard to deal with...and safety of my family is priority
SEE THE NOTES
A CLIENT STATES: COLLISON ASSIST INOP
CAUSE: .
540650 ON-BOARD POWER SUPPLY VOLTAGE MAINTAIN
(WHEN CHECKING/ TESTING AND TROUBLESHOOTING)
105231 W08 2.33 0.10 175 1547 15.47 15.47
1 000-905-28-04 RADAR
SENSOR 30200 50500 0 505.00 505.00 505.00
541011 QUICK TEST PERFORM
105231 W08 0.00 0.20 350 3094 30.94 30.94
300641 INDIVIDUAL PARTS OF SPEED CONTROL SYSTEM:
.................... CHECK ACCORDING TO
FAULT CODE
105231 W08 0.00 0.40 700 6188 61.88 61.88
881102 FRONT BUMPER, COMPLETELY ASSEMBLED UNIT
REMOVE/INSTALL
105231 W08 0.00 0.80 1400 12376 123.76 123.76
304230 RIGHT RADAR SENSOR REPLACE (BUMPER
REMOVED)
105231 W08 0.00 0.10 175 1547 15.47 15.47
30200 50500 TPARTS
2800 24752 TLABOR
VERSION 1 (EMP# 105231,24JUL15 14:22): 12449
***WAR***105231***COLLISON ASSIST**** TEST DROVE AND FOUND WITH NO
OTHER CARS AROUND COLLISION ASSIST WILL GO OFF. OUT AT 11:15 12421 IN
AT 11:40 12428. INSTALLED BATTERY CHARGER. SDS TEST FOUND CODE C10C800
There is a warning from the control unit 'COLLISION PREVENTION ASSIST'.
REMOVED FRONT BUMPER AND CHECKED SENSOR AND WIRE HARNESS. CHECK
CONNECTIONS ON ENGINE CONTROL UNIT. ASSEMBLED AND STILL FOUND WILL
RANDOMLY ACTIVATE. REMOVED FRONT BUMPER, REPLACE COLLISION ASSIST
RADAR. ASSEMBLED. WITH SDS COMPLETED SNC CODING AND TEST DROVE. FOUND
NOW WORKING TO MB SPECS.
B CLIENT STATES: WHENEVER THE INOP ASSIST COMES ON CANNOT ACCELERATE
NC NO WORK COMPLETED AT THIS TIME
105231 INC 0.90 0.00 0 0 0.00 0.00
VERSION 1 (EMP# 105231,24JUL15 14:23): 12449 SEE LINE A FOR REPAIR
C CLIENT STATES: BEST CONTACT #469-406-4050
BC BEST CONTACT #
105231 INC 0.00 0.00 0 0 0.00 0.00
D BLEMISHES NOTED: 2 OTHERS
BLEM WSA WALK-AROUND
105231 INC 0.00 0.00 0 0 0.00 0.00
E CLIENT STATES: FAB ACCENTIVE TOUCH LOCK NOT WORKING WHEN YOU PUT HAND
ON DOOR HANDLE(SECOND TIME IN FOR ISSUE)
NC NO WORK COMPLETED AT THIS TIME
105231 INC 0.00 0.00 0 0 0.00 0.00
VERSION 1 (EMP# 105231,24JUL15 14:23): 12449 WHILE TESTING SYSTEM,
FOUND NO CODES AND LOCK WORKING TO SPECS.
F CLIENT STATES: FINAL TEST DRIVE AFTER VEHICLE SERVICE
TEST FINAL TEST DRIVE AFTER VEHICLE SERVICE
105231 INC 0.00 0.00 0 0 0.00 0.00
G** CLIENT STATES THAT THEY WERE HAVING A PROBLEM REVERSING WHEN
PUSHING PETAL DOWN IT WOULD NOT MOVE ALMOST AS THE PETAL WAS
STUCK
NC NO WORK COMPLETED AT THIS TIME
105231 INC 0.00 0.00 0 0 0.00 0.00
VERSION 1 (EMP# 105231,24JUL15 14:25): 12449 NO FAULT CODES. TESTED
ON TEST DRIVES. FOUND OPERATING TO MB SPECS AT THIS TIME.
H** RETAIL TINT COMPLETE
RTINT RETAIL TINT COMPLETE
114 CM 0.00 3.00 4440 35500 355.00 355.00
VERSION 1 (EMP# 114,27JUL15 13:59): 12449 INSTALLED FULL WINDOW
TINT TECH #114 3.0 HRS
EST: 0.00 20JUL15 16:53 SA: 104946
05-03-2015, 08:53 AM
Collision Prevention Assist Plus Inoperative Error
, but it happened to me after I was hit to the side.
The same message popped up saying that the vehicle is inoperable and at the same time the ABS kicked in which made me drift my way back home 
