So I was driving around town and suddenly car went into a limp mode showing ESP unavailable and PRE-SAFE off. I tried accelerating to get out of the way, but the car was barely moving then with the pedal all the way down. I scanned for codes and got - P060D Internal Control Module Accelerator Pedal Position Performace. I looked around, and everywhere everyone was saying replacing the pedal with the sensor would fix the issue. My pedal arrived and I replaced it but the problem is still there even with trying to erase the codes or disconnecting the battery. I was wondering if anyone has any information about this. Could it be Throttle Body issues? or anything of that sort? Thank you I do have pictures of the codes if that helps.

 

Check connection/connector @ pedal & connector/relative pins out @ CU.

 

Thank you for the help, and how would I check the connections? or what tool is best for checking.

 

Visual inspection.

 

These amazing '14 really deliver the Mercedes experience.


Recap:
1- limp mode with a code for bad accelerator sensor.
2- new pedal installed without any improvement


How is that:
At the end of the day, this is 90% likely ECU glitching under bad power. This car is built like a perfect test case for :
Corrupted pedal inputs by noisy signal lines when glitches become significant during marginal voltage conditions.


What to do:
1-- check car voltage while driving for marginal ECU regulation: 12.0V x 90A = 1kW battery buster 🙂

2-- check the main battery condition (charge/replace)

3-- Float battery when practical to prevent parking drain

4-- Clean the poor GND paths (pins + posts).

5-- Avanced noise hunting: PWM vs. signal path!


I am afraid we got what we paid for! A genuine luxury trouble without simple fix.

To exemplify that, we'll note that shortly after production MB had a campaign to replace all "affected pedal sensors" (MY'14 included) - This expensive dealer part swap did nothing to fix the root cause, just plain wasted ressources 👏

That in turn exemplifies my recent comment regarding the lack of effective troubleshooting tools.
Engineers are disempowered without actionable feedback to work with. Beautiful MB cars become used bargains at the Lexus dealer lot.


Prevent man-made engineering defects:
- Practice industry standards: ECU not installed over exhaust pipes or engine crown.
- Harness bundle noisy power near low signals 🫤
- Quit painting GND posts... LOL 🙄
- Use result oriented statical QC technics like Japan
- Extend honest warranty coverage (Korean: 100kMi)


"Suitability dashboard for idiots":
Now that silicon microcontrollers chips are dirt cheap and powerful, their application is truly limited by the cost of development (sucks because we keep it so!)

No OEM outside Japan is going to invest in building custom engineering tools unsupported by the Bosch ECU. Meaning smart tools need to realistically come from the top and roll downhill.
Such that...: VIP Modules should have a performance flag or gauge, not just a pass/fail codes.

Case in point getting a limp mode without warming can be a death sentence on the open highways.


tropical simplicity

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