reduced engine power

[mdors]

Had the exact problem with my '06 LBZ. It came on gradually when passing a vehicle, etc. I had a predator with the 65hp program installed. The truck had about 11000 miles on it. I started reading posts on this site and read one concerning the fuel filter. I changed the fuel filter and that solved the problem.

[SoTxPollock]

FIN WOOZLE, In Texas if someone dared to do that not only would we unplug the limiter, but also the person from holding a position in the government.
What happens if one needs to accelerate in order to get out of the way of another vehicle and cannot avoid the accident because they can't accelerate? That really is BS.

[Mark Rinker]

In Minnesota, we'd pass a new law limiting commercial trucks to 55mph (like California) and let police enforcement issue lots of tickets. The government officials would vote themselves a new pay raise with the additional revenues, roads would continue to deteriorate. (Commercial drivers would continue to speed - just not around known police enforcement areas!)

Sounds like you could reflash your ECU and get around the speed limiter, or at least bump it up a few percent...

[mark45678]

Not sure what the code is that your seeing but it sounds like the motor goes into protect mode. Will it rev over 2000 rpm? if not when was the last time you replaced your fuel filter? more then 10000 miles or 200 engine hours?

[colt49]

Your Laplander Lawmakers would crap if they saw 5000 AMERICAN TRUCKS Blow into town in a convoy with rifle racks and ropes hanging in the back windows!!! Norway has some very bad laws. I'm glad the USA still lets us make our trucks like we want. The government tried that 55 MPH law in the 70's and made the auto industry make junk underpowered smog smothered cars and trucks. This is a prime example of what Americans should watch out for again with stupid lawmakers solving our problems and all these lawmakers have DUI's, bankruptcies, back owed child support etc. Congress is full of losers if you read about each and everyone's profile. The revealing factor is they have to expose theirselves for all research on their personal info to the public to be in an elected office. We have our situations too but we at least can run our trucks like we want for the most part!!! Look at the flag today and remember this story from Norway. They aren't free.

[Fin_Woozle]

I'll try replacing the filter since it's coming up in the near future anyway. I sure hope it's something that simple.

To be sure it's not the limiter messing my truck up, I could try cutting the wire from the speed sensor to the limiter and reprogram the ECU for the ~55 mph limit via OBD2. I only have general OBD2 software and nothing GM specific, so I'd have to do it manually using a terminal program. The only problem is that I have no idea what the commands for altering the speed limit are...

mark45678 - It'll rev above 2k if I push the gas pedal gently. Otherwise it'll limit revs to 2k. The message "reduced engine power" appears on the DIC. No DTCs appear during or after the message. The truck (and the filter) only has about 4k miles and 270 engine hours on it.

colt49 - I'm not sure what kind of laws our northern neighbor has. I assume EU regulations don't apply there since Norway is not a member of the European Union. Touching post (I could almost hear "The Star Spangled Banner" playing on the background), but in my opinion a bit off-topic.

[Kennedy]

Fuel filter first, and consider adding fuel lift supply pump(s) to get best life from your filters and most consistent performance.