SL/R230: ESP malfunction and limp mode as soon as I hit WOT
Thread Starter
MBWorld Fanatic!
Joined: Dec 2006
Posts: 1,308
Likes: 62
From: Bethesda, MD
2000 SL500
ESP malfunction and limp mode as soon as I hit WOT
Good Evening everyone,
(Repost from AMG r230 section)
I have been noticing the ESP malfunction and limp mode as soon as I hit WOT on my 2007 SL55 with 92k miles. Will not get out of limp mode until I turn off the car and restart, problem goes away right away and ESP is working normally.
I used my iCarsoft (I know I will eventually get SDS) and got the following errors:
-B37 (accelerator pedal sensor): Signal 1/short circuit to positive/potentiometer above maximum value (P0123)
-The CAN data from control module Motor electronics is invalid or unreasonable (Accelerator pedal position)
-ESP Electronic Stability Program Control
At first thought steering angle sensor(before pulling codes) did the reset and no luck. Next, I did the TB reset and still same thing. Finally after pulling the codes, I took the pedal off and sprayed electronic cleaner on the sensor on the pedal and its connector. Waited for everything to dry and still got the same ESP and limp mode as soon as I hit WOT.
I read the part number on the pedal to be: 2303000604
I was going to order a new pedal, just wanted to check in with the forums to see if anyone else has any other advice? While I am at it, I am going to replace the brake light switch as well...I have had these go bad on almost all my older MBZ vehicles.
Thank you all for your time!
(Repost from AMG r230 section)
I have been noticing the ESP malfunction and limp mode as soon as I hit WOT on my 2007 SL55 with 92k miles. Will not get out of limp mode until I turn off the car and restart, problem goes away right away and ESP is working normally.
I used my iCarsoft (I know I will eventually get SDS) and got the following errors:
-B37 (accelerator pedal sensor): Signal 1/short circuit to positive/potentiometer above maximum value (P0123)
-The CAN data from control module Motor electronics is invalid or unreasonable (Accelerator pedal position)
-ESP Electronic Stability Program Control
At first thought steering angle sensor(before pulling codes) did the reset and no luck. Next, I did the TB reset and still same thing. Finally after pulling the codes, I took the pedal off and sprayed electronic cleaner on the sensor on the pedal and its connector. Waited for everything to dry and still got the same ESP and limp mode as soon as I hit WOT.
I read the part number on the pedal to be: 2303000604
I was going to order a new pedal, just wanted to check in with the forums to see if anyone else has any other advice? While I am at it, I am going to replace the brake light switch as well...I have had these go bad on almost all my older MBZ vehicles.
Thank you all for your time!
Banned
Joined: Jan 2006
Posts: 1,982
Likes: 393
From: Atlanta, unfortunately
'09 S600, (2) R129 300SLs, '03 SL500, '03 SL55
Last year I replaced a faulty accelerator pedal, and the new pedal had the issues you describe.
The maximum voltage on one of the potentiometers is permitted to be c. 4.8 volts, and at wide-open throttle Star Diagnosis revealed that mine was .1 volts beyond the upper limit. I taped a thin piece of plastic over the pedal's stop to very slightly reduce the pedal's travel without interfering with the kickdown switch operation, and the problem was cured.
The maximum voltage on one of the potentiometers is permitted to be c. 4.8 volts, and at wide-open throttle Star Diagnosis revealed that mine was .1 volts beyond the upper limit. I taped a thin piece of plastic over the pedal's stop to very slightly reduce the pedal's travel without interfering with the kickdown switch operation, and the problem was cured.
Thread Starter
MBWorld Fanatic!
Joined: Dec 2006
Posts: 1,308
Likes: 62
From: Bethesda, MD
2000 SL500
Last year I replaced a faulty accelerator pedal, and the new pedal had the issues you describe.
The maximum voltage on one of the potentiometers is permitted to be c. 4.8 volts, and at wide-open throttle Star Diagnosis revealed that mine was .1 volts beyond the upper limit. I taped a thin piece of plastic over the pedal's stop to very slightly reduce the pedal's travel without interfering with the kickdown switch operation, and the problem was cured.
The maximum voltage on one of the potentiometers is permitted to be c. 4.8 volts, and at wide-open throttle Star Diagnosis revealed that mine was .1 volts beyond the upper limit. I taped a thin piece of plastic over the pedal's stop to very slightly reduce the pedal's travel without interfering with the kickdown switch operation, and the problem was cured.
thank you for your response.
Banned
Joined: Jan 2006
Posts: 1,982
Likes: 393
From: Atlanta, unfortunately
'09 S600, (2) R129 300SLs, '03 SL500, '03 SL55
Getting an appropriate thickness was a trial-and-error process, and I used Star Diagnosis to monitor the potentiometer voltage and get it right.
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Junior Member
Joined: Oct 2017
Posts: 36
Likes: 9
C63 AMG, 911 Turbo, E46 M3, SL63 AMG
Thank you @bobterry99 problem solved with a tiny felt pad on the contact point.
No need to order a new part to replace one that has barely been used anyway.
Works like a charm!
No need to order a new part to replace one that has barely been used anyway.
Works like a charm!
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