3rd Gen Engine and Drivetrain -> 2003-2007 5.9 liter Engine and drivetrain discussion only. PLEASE, NO HIGH PERFORMANCE DISCUSSION!

Code P 2121

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Old 01-02-2008, 02:22 PM
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Code P 2121

The throttle on my 03 auto acted up this morning coming to work it slowed down by its self and then took off like a rocket I never changed throttle position. I'm assuming its the TPS the CEL came on and now I have this code can someone tell me what the code means??
Old 01-02-2008, 02:49 PM
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That is a TPS code , some have had success cleaning , a search for cleaning should find the directions .
With a wiring diagram , to find what color to connect a meter to , move linkage slow & watch , should move with a slow increase in resistance with out any erratic or loss of reading , if odd readings replace or clean .
Old 01-02-2008, 03:42 PM
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Thanks I'll see what I can find.
Old 01-02-2008, 07:04 PM
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If it is your TPS sensor, the cheapest place to buy one is from Cummins, its half the price dodge wants for it.
Old 01-02-2008, 08:54 PM
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Have you tried resetting it. Look in the tech fact's on how to do it.
Old 01-04-2008, 01:35 PM
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Thanks guys It reset its self I guess the check engine light went off and it has not done it since. The truck did this one other time after we bought it about a year ago.
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