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Old 07-21-2019, 05:20 PM
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milomilo milomilo is offline
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Join Date: May 2010
Location: Wheatland, Wyoming
Posts: 15,169
Default Check Engine Light

Headed out of town yesterday when the 2004 Dodge Cummins 5.9 Check engine light comes on and it goes into limp mode. 10 seconds later it goes back into normal throttle. Light stays on engine runs perfectly. Stop and turn off engine, wait 30 seconds and restart, Light still on. Drive home running fine.

Started the truck this morning, no light and runs fine. Download codes at O'Reilys Auto.

P2121 and P2122.

P2121: THROTTLE/PEDAL POS SENS/SWITCH D CIRC RANGE/PERF
P2122: THROTTLE/PEDAL POS SENS/SWITCH D CIRC LOW INPUT

It showed up 6 times on the reader. All codes were deleted.

Wondering if it is a bad connector or bad sensor.
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