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Hi Allyn. Welcome to JA. I am Buddy, and i will try and help you out.
You should have a shutdown override/diagnostic request switch.
Let me know what codes you come up with, and also which light they were blinked on.
Thanks for the reply.
I would double check those flash codes. 55 and 35 are the active faults.
Flash Code 35 p 100/3 indicates that the engine Oil Pressure Sensor/Engine Oil Pressure Sensor (OPS/EOP Sensor),input to the ECM/ECU has exceeded 95% (normally > 4.75 volts) of the sensor supply voltage.? This is more then likely a faulty oil pressure sensor or wiring to sensor issue.
The SAE J1587 equivalent code for Flash Code 55 is s 231/12, ECM/ECU fault and s 216/14, missing other ECM/ECU. It also indicates DDEC ECM/ECU has lost its connection with other ECM/ECU devices or indicates a loss or shorted J1939 data link. If code s 216/14 is logged with p 86/14 then Smart Cruise has a fault. If code s 216/14 is logged with p 84/12 there is an incorrectly programmed or shorted J1939 data link.?This can be caused by several things and normally can be a pain to troubleshoot.
I hope this helps you out. If you have anymore questions, or info just ask.
Just reply back at any time.
Buddy, R/S guy said it has several issues and with low voltage to waste gate, Speed sensor, truck runs fine for 2000 ft then slows down fortunatelly he is close to the Freightliner dealer so they are limping it to there for the rest of the weekend Thank you for your help.