Truck has 50000 miles engine light comes on be chile goes into reduced power mode engine won’t allow truck over 50 mph. Turn vehicle off truck runs fine engine light stays on for a while then shuts off took to dealer explained issue. Engine checked no codes. Happened a second time they cked codes said it could be a fuel pump but not sure . happened a third time scheduled to go back for repair again engine light has sit off truck running fine no codes showing

 

Interesting. Curious to know what they find.

 

The first thing to check is the actual output from the fuel pump in gallons per minute. Once you know that the troubleshooting is going to be much easier and much faster. When was the last time you changed the fuel filter on the truck?