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Hey guys,

My boss has an '06 2wd Frontier (Automatic). He called me a bit ago with the following scenario:

It sputtered and then stalled on him when he was braking on his way home today. He started it up again and it wouldn't go above 2000rpm and it stayed in 4th gear. He could put it in Park and Reverse, but as soon as it went back into Drive it would be in 4th.

No codes.

Any ideas?
 

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By 4th, do you mean it is actually in 4th gear and will barely take off or is over drive off and the gauges say 4?
 

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the tranny has a fail safe limp mode that puts it in 4th in case of problems so you can limp home same goes for the rpm, in case of problem limp mode will limit the rpm. why this happened with no code is a very good question though....
 

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Sounds like its in limp mode. First, I'd check the trans fluid level.. its not likely, but its easy to check and fix. THen, i"d get a good scanner and check for transmission codes. It wouldnt necessarily throw a CEL, but could still have a code. A regular obd2 scanner won't read this. Have him unplug the battery for a couple min and re-connect it. That may 'reset' anything that could be messing it up. Other than that, he's going to have to bring it in for a diagnostic at a shop w/ a good obd scanner that can see whats going on w/ it.
 

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Sounds like its in limp mode. First, I'd check the trans fluid level.. its not likely, but its easy to check and fix. THen, i"d get a good scanner and check for transmission codes. It wouldnt necessarily throw a CEL, but could still have a code. A regular obd2 scanner won't read this. Have him unplug the battery for a couple min and re-connect it. That may 'reset' anything that could be messing it up. Other than that, he's going to have to bring it in for a diagnostic at a shop w/ a good obd scanner that can see whats going on w/ it.
this^^^
 

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yep even though no cel there is still a code.
fail safe is described as a safe driving mechanism to let you take your truck to a trans shop because there is something wrong with it or wiring.

fail safe and limp are two different things though. what you describe is he has both.
limp mode is the engine, fail safe is for the trans. there is a number of things for the engine that can throw it into limp.

should try the ecu reset and if problems persist i would take it to a dealer.
 
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