Stickstome2

tracking today . But have problem . Even with ESP turned off it went into limp mode right on track . One time three times during the session . I have track wheels with no sensors , so the tpms light is on and race seats with harness so the seatbelt light stays on . However I've always done this and not had a problem . So it happened this morning and so I turned the ESP off . And ran one session and then happened repeatad . What can I do ?

Stickstome2

It's says ESP inoperable or something . I know I can search but hoping someone can answer quickly because I have to track tomorrow agaim

Stickstome2

Ive tracked this car several times even with ESP on and it didn't go into limp mode . But today happened 4 times while on track .

Tex5

Did you change your race wheels or tires ? A friend has the same issue on a C63BS with Pirelli trofeor R only, no issue with PS Cup 2. For him is was due to the very hard "side" of the trofeo.
Perhaps an ABS/ESP sensor too.

For the seat belt light (and sound ?) when running harness you can deactivate it with SDS.

Stickstome2

Curious why tire brand made that difference . I lowered my front tire pressure about 4-6 lbs but that's it .

so scanning at track here are the codes z
p2629
p0050
p0150
p0610
p2626
p2629
p0050 again and
p2626 again .

so would these send my car into limp mode on track. Tire pressure is 36 front and it calls for 46 on door but that's too high for track tire . So would tpms put car into limp mode even with ESP off?

Tex5

You have at least 3 codes related to O2 sensor
For TMPS I don't know, do not have it on my european version

Stickstome2

Maybe I can have the AMG dealer disable the TPMS

MOFLO

If those are O2 sensor codes then you may be running lean (i doubt it would be rich). If so, then the ECU will protect the engine by going into limp mode.
What was the temperature at the track that day?
What kind of fuel were you running?
Any ECU tunes installed?

The TPMS and Seat-belt errors should not be related to limp mode, IMHO. I have those warning lights as well and have no problems on the track.

Stickstome2

I thought the same thing about temp or something but when it goes into limp it says ESP inoperative. Even with the ESP off ' it still goes In limp and says the same thing , like I'm hitting the limit if the yaw sensor, which is impossible . You should. S able to slide, drift , do donuts whatever before it kicks in

Stickstome2

About 82 degrees non humid that day . For car temp I don't know and it has a renntech tune

COOPERDB

`



I would get the O2 sensor codes checked as to why

they are showing up

What kind of fuel?

To the OP please keep this thread updated


Thank-You
D.B.


`

MOFLO

The type of gas my have an impact on this situation as well. What octane where you running that day? or typically run?

This could be a faulty sensor issue which is causing a compounded issue that presents itself as an ESP error.

Does the issue appear after heavy braking? If not, is there anything in common when the issue does appear? For example, coming into or out of a turn? Full or partial throttle?

Curious to find out why this is happening...

Stickstome2

93 octane and usually under very to full throttle . Sometimes on the straight , so no real movement . AMG person I'm taking it to next Tuesday said it might be a speed sensor on just one wheeel

Tex5

Was the ABS inoperative too ?

Stickstome2

Actually no . The only thing the cluster said was ESP inoperative.

Tex5

Because if I am not wrong, the sensors that are used for ESP are the same than for ABS.

MOFLO

Hopefully the diagnostics the AMG tech can run will provide more insight to the codes you are receiving. Either the O2 sensor code is causing the limp mode or the ESP warning is causing the limp mode. However IMHO, I have a feeling they are not related errors and the O2 sensor is causing the limp mode.

If the Renntech tune is pushing close to the tolerances (or past) of the O2 sensor for the fuel trim or timing parameters, then it could result in this situation. Although, Renntech is good at testing their tunes for this type of thing. So you may simple have a faulty sensor.

When was the last time the air filters and fuel filters were changed?

Stickstome2

When in bought it from renntech they did all the maintenance . But that a good question . Oil was clean and still is . Not sure about fuel filter . Maybe I'll have them that anyway

MOFLO

Do you have an oil/air separator installed?

It's a must have for these motors.

Tex5

+1

Stickstome2

No don't have separator . And AMG guy is looking at it next week . I'll post what he says . Is there a kit out there for the separator ?

Tex5

Weistec has an airl/oil separator. It is good quality even if not really cheap

Stickstome2

Ok so car is at AMG place . They found the accelator pedal module is bad . He said that's why it was going into ESP limp mode . Might not do it under regular exceleration but mayunder wot or close the pedal tracer sensor will freak out the car . Does this sound right ?

Stickstome2

It's expensive too . But if it fixes the problem then yay

MOFLO

Sounds odd to me but if it fixes the problem all the better!