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Old 02-02-2008, 05:18 PM   #1 (permalink)
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02 won't rev past 1,500 RPM's

I just went to look at an 02 cummins, 6 speed and when my buddy went to test drive it he said it wouldn't rev past 1500 rpm's and that was in every gear. Truck has 91,000 miles on it. Anybody have an idea of what could be wrong?

also... There was a lot of white smoke coming out of the stacks when the guy pulled it around for us to see. The truck wasn't warm when he pulled it around so we don't know if that could be the case.
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Last edited by metalli445; 02-02-2008 at 09:26 PM.
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Old 02-03-2008, 06:45 PM   #2 (permalink)
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Sounds like it might be in limp mode.
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Old 02-06-2008, 04:27 PM   #3 (permalink)
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How do you get it out of limp mode? Undo the batteries?
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Old 02-06-2008, 04:43 PM   #4 (permalink)
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if its in limp mode I believe you have to take it to the dealer and heard its kinda spendy..
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Old 02-07-2008, 01:09 AM   #5 (permalink)
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I had to disconnect the batteries for 5 to 10 minutes the first few times this happened. It still happens occasionally but all I have to do is turn the key off and restart. Now I can do this while rolling, in neutral of course.

It is very intermittent, practically rare, but the situation when it occurs has been consistent. On hot temperature days and the truck is idling for upwards of 5 minutes then using reverse. Such as idling in front of a store then backing out onto the road for example.

Unfortunately I do not enough to explain why this happens or why I had to disconnect the batts the first few times (all in the same drive) and now I can just cycle the engine off/on to clear it.

I have never heard or read about having to take it to a dealer to clear limp mode, but I am certainly not an expert and this would not surprise me. I seem to recall that other conditions may cause the rpm limit situation. Let us know if disconnecting the batts clears to condition or if we need to look for a different solution.
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Old 02-08-2008, 09:45 PM   #6 (permalink)
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Did you check for codes?
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Old 02-11-2008, 09:41 AM   #7 (permalink)
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The truck was for sale at a dealership. Once we told the guy who was interested in the truck about the problem, he lost all interest in the truck so he's still looking for another one.
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Old 02-11-2008, 09:48 AM   #8 (permalink)
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I'd take in to a parts store and get the codes read. Most places will do this for free. you can do the key-on-off-x3 but I found once that didn't tell the whole story. My truck was once in limp mode too and it was simply the map sensor...a very easy fix.


as far as the white smoke goes...does it go away when the truck warms up?
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Old 02-11-2008, 04:46 PM   #9 (permalink)
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I would check for codes first thing...
OBD II Error Codes

Error code listing...
http://mopar.mopar1973man.com/2002%2...or%20Codes.pdf

Then I would check fuel supply issues...
Lift Pump Diagnostics
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Old 02-11-2008, 05:15 PM   #10 (permalink)
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i would guess that it may be a boost leak.

but it could be as simple as a broken wire to say that the truck is in gear as opposed to in neutral, as most vehicles have limiters placed on the rev's while in neutral. (neutral safety switch) loose or broken?
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