Clk430 p0500 and p0720 after changing tires
Thread Starter
Newbie
Joined: Jan 2013
Posts: 8
Likes: 0
clk430 convertible
Clk430 p0500 and p0720 after changing tires
Hello mbworld first of all I searched threads all over but I can't find exact info I need I have a 2000 clk430 vert after getting new tires the brake light cel visit workshop so I stop by autozone and scanned got codes for p0500 which is vss vehicle speed sensor and p0720 vehicle speed output
It's causing my car not to shift and high rpms and speedmotor at 0
But what's weird at first start up it drives normal then all lights come on then the symptoms I described happens again then I shut off then again and drive normal for 5 mins or so then same symptoms
Ima great diyer and worked at BMW shop as helper for a year so I'm not scared to do my own repairs so I can help out too if I can
I hate electrical work by the way
It's causing my car not to shift and high rpms and speedmotor at 0
But what's weird at first start up it drives normal then all lights come on then the symptoms I described happens again then I shut off then again and drive normal for 5 mins or so then same symptoms
Ima great diyer and worked at BMW shop as helper for a year so I'm not scared to do my own repairs so I can help out too if I can
I hate electrical work by the way
MBWorld Fanatic!
Joined: Apr 2005
Posts: 3,784
Likes: 84
From: SCV SoCal
2002 CLK430
The short answer is, it may be the tires. If not, possibly a speed sensor.
The longer answer is the logic behind how your speedo works is built around the rolling diameter of your front and rear tires being very close. To calculate vehicle speed, the instrument cluster computer checks the wheel speed of all four wheel speed sensors. The instrument cluster receives the wheel speeds in RPM from the traction system. The individual wheel speeds are compared and checked for plausibility (for example; do the speed sensors indicate three wheels spinning at 80 MPH and one at 20 MPH?). If wheel speed signals differ significantly, you will have issues. If no significant differences in individual wheel speed signals are found, the left front wheel is used to establish vehicle speed. Since your issues started as soon as you got the tires, lets start there. Please post the exact tire make and sizes that you had installed, front and rear. If it's not the tires, a speed sensor may be damaged.
BTW a P0500 is a partial message. The P0500 means either a 20CA (the left rear wheel speed sensor isn't sending a signal) or a 20CB (the left front wheel speed sensor isn't sending a signal). If it's not the tires, a shot of compressed air and possibly some brake cleaner may used to clean the left side wheel sensors. I'd wear a mask.
The longer answer is the logic behind how your speedo works is built around the rolling diameter of your front and rear tires being very close. To calculate vehicle speed, the instrument cluster computer checks the wheel speed of all four wheel speed sensors. The instrument cluster receives the wheel speeds in RPM from the traction system. The individual wheel speeds are compared and checked for plausibility (for example; do the speed sensors indicate three wheels spinning at 80 MPH and one at 20 MPH?). If wheel speed signals differ significantly, you will have issues. If no significant differences in individual wheel speed signals are found, the left front wheel is used to establish vehicle speed. Since your issues started as soon as you got the tires, lets start there. Please post the exact tire make and sizes that you had installed, front and rear. If it's not the tires, a speed sensor may be damaged.
BTW a P0500 is a partial message. The P0500 means either a 20CA (the left rear wheel speed sensor isn't sending a signal) or a 20CB (the left front wheel speed sensor isn't sending a signal). If it's not the tires, a shot of compressed air and possibly some brake cleaner may used to clean the left side wheel sensors. I'd wear a mask.
Newbie
Joined: Dec 2016
Posts: 3
Likes: 0
2001 mercedes clk430
I have the same problem after changing tires original size (f-225-45/17, r-245-40/17) & new wheel size Im putting on. (f-245-35/18, r-285-35/18. My question is there anything I can do (recalibrate?) to run these new tires. Or do I have to stay with original tire size all the time. In other words I can't change wheels and tires on this vehicle.
MBWorld Fanatic!
Joined: Nov 2001
Posts: 1,259
Likes: 209
From: Boston North Shore
2001 CLK320 Cabrio
I have the same problem after changing tires original size (f-225-45/17, r-245-40/17) & new wheel size Im putting on. (f-245-35/18, r-285-35/18. My question is there anything I can do (recalibrate?) to run these new tires. Or do I have to stay with original tire size all the time. In other words I can't change wheels and tires on this vehicle.
There are numerous 'tire size calculators' online to help you determine this.
MBWorld Fanatic!
Joined: Feb 2011
Posts: 2,562
Likes: 197
From: Austin, TX
2006 E55, 2012 GLK350 & 1992 190e sportline
Really the OE tire circumference isn't that important if you dont care about the speedo. Having them differ front to back will screw up the traction control.
Trending Topics
MBWorld Fanatic!
Joined: Oct 2015
Posts: 2,428
Likes: 402
From: Merkville the galaxy of Stars
'99 CLK/05 E500 WAG
CLK 430
I have the same problem after changing tires original size (f-225-45/17, r-245-40/17) & new wheel size Im putting on. (f-245-35/18, r-285-35/18. My question is there anything I can do (recalibrate?) to run these new tires. Or do I have to stay with original tire size all the time. In other words I can't change wheels and tires on this vehicle.
MB World Stories
The Best of Mercedes & AMG
New Electric Mercedes-AMG GT 4-Door Coupe Unveiled: 10 Things You Need to Know
Verdad Gallardo
6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)
Verdad Gallardo
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
MBWorld Fanatic!
Joined: Jul 2012
Posts: 1,254
Likes: 171
2002 CL500 to CL55 conversion
That’s really weird.. I recently had a tcu tune done, it took some extra hours to set things up over Star because my I have a Cl55 engine and e55 transmission in my cl500. Once we got the new tcu working it was pretty cool, faster shifts, new M mode etc
but there was some uncertainty within the transmission around 35mph, it was like it couldn’t tell whether it wanted 3rd/4th or 5th gear when cruising. Or perhaps like the torque converter was locking and unlocking over and over..
anyways. Yesterday I was driving spiritedly (as usual) and my cruise control and speedometer all shut off at once at about 65 mph...Soon after the car would get stuck in either 3rd or 5th gear until I restarted the car. This happened twice over the span of about 2 hours. Eventually it set a p0720 code
today I drove the car for many hours, no returning p0720 code strangely enough. I decided to look up p0720 and I came across this thread...
then i remembered two days ago I got two new (used) rear tires! And I went with 255/30/20’s instead of 275/35/30 because they were cheap. I’m starting To wonder if the car has “adapted” to the new tires... although I’m not in disbelief that I may need a new conductor plate sooner than later... hope this helps someone else who gets new tire sizes and a p0720 code
but there was some uncertainty within the transmission around 35mph, it was like it couldn’t tell whether it wanted 3rd/4th or 5th gear when cruising. Or perhaps like the torque converter was locking and unlocking over and over..
anyways. Yesterday I was driving spiritedly (as usual) and my cruise control and speedometer all shut off at once at about 65 mph...Soon after the car would get stuck in either 3rd or 5th gear until I restarted the car. This happened twice over the span of about 2 hours. Eventually it set a p0720 code
today I drove the car for many hours, no returning p0720 code strangely enough. I decided to look up p0720 and I came across this thread...
then i remembered two days ago I got two new (used) rear tires! And I went with 255/30/20’s instead of 275/35/30 because they were cheap. I’m starting To wonder if the car has “adapted” to the new tires... although I’m not in disbelief that I may need a new conductor plate sooner than later... hope this helps someone else who gets new tire sizes and a p0720 code
Junior Member
Joined: Jun 2017
Posts: 69
Likes: 0
clk430
I bought new factory size tires and had weird issues..Scary when driving in the mountains and ABS and traction stuff goes off..I could usually stop, turn car on and off and back to normal..Replaced Uniroyal with Generals and problem was gone..I now wonder if they had a 245 on front and visa versa..Tires also wore out in about 8000 miles
