Cummins ISM overheating

That doesn't mean anything. My truck had an overheating problem and I babied it for 5 years before I found the cause. I downshifted on grades and ran the fan alot. Voila no overheating.
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Hmm, ok, that code is for the intake manifold pressure data incorrect.

There are actually two fault codes for over temp. The first is at 225 degrees, code 2963 for moderate and then it will log a critical code at 241 degrees, code 151. So not sure how they are determining it is overheating.

 

180 bobtailing and 220 with a empty trailer? That's.......hard to comprehend. FWIW I'll tell you what I did to solve my problem.....I knocked the baffle out of my muffler.

There are a few things I would do before I let anyone take my cylinder head off.
1. Verify gauge
2. Remove muffler and install straight pipe
3. Run ~20 ft or rubber hose from the rad cap overflow to a clear plastic bottle filled with water and see if you have any bubbles when it's over heating
4. Change water pump

 

Sorry....FWIW = for what it’s worth.

My problems were high Exhaust Gas Temperatures on the pyrometer gauge and high coolant temps when climbing hills loaded. I was able to manage it by dropping a gear or two and turning the engine fan on.

 

Yes, they may have mis-typed that code. Double check with them.