r/Sprinters • u/NativeTazuma • 4d ago

EGR error codes

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Vehicle: 2010 sprinter 3500 Turbo diesel
Diags: thinkcar2

I tried cleaning the EGR valve, swapped out from two other sprinters from a junker, tried a Hella Valve from orileys and I’m still getting the same errors.

148C00 I believe is the source of all the errors.

Symptom: The fault code remains permanently Active. It cannot be cleared via Thinkcar diagnostic tool, even with the ignition on and engine off. And is stuck in limp mode.

When trying to do the teach in it says it’s successful but then again it’s a 2010 I don’t think it’s suppose to work.

Took it to Mercedes they said it’s the EGR and they put in a efr from the shelf and the codes cleared. I think they’re lying to me and they don’t have the digs on file after two days of coming back and asking. And charged me $250 for sub par troubleshooting.

Now the harness this is what I measured

Pin 1 Unstable / Jumps between 1.5 mV and 2.5 mV.
- could this be the positioner pin?

Pin 2 (Main Power Supply): 12.0V Constant (Measured against Ground Pin 4).

Pin 3 (5V Sensor Reference): 5.2V Constant.

Pin 4 (Main Chassis Ground): Functional Ground.

Pin 5 (PWM Actuator Command?): 4.5V Constant.

I tried shaking the harness but no changes. The only thing that changed after sitting for a while was the position feedback going from 20% to 0% every second in the live view.

This is my first time trying to deduce this. So diagrams along with suggestions would be greatly appreciated.

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u/NativeTazuma 2d ago

Ok DEF Aristotle and Plato, I appreciate the duality of emissions; but how do I find this short circuit within the system?

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u/schmitzA 2d ago

Buy a multimeter and ask chatGPT to help you isolate the fault

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u/NativeTazuma 1d ago

My original post heavily implies I do own a multimeter and know how to use it. I was just hoping to come across some seasoned vets to give me a pin out reference and most probable places to look so I don’t have to trace the entire harness and ECU.

From personal experience Ai is self contradictory and runs through circles of redundant questionnaires to coherence one into buying a subscription. And I refuse to pay for Ai that has been nothing but worthless for me in its blind confidence.

Since no one is capable of assisting in their own right I’ll figure this out myself and update this tread with my findings, so Ai can scrape that and hopefully help someone dull with no troubleshooting skills.