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Discussion Starter #1 (Edited)
have a 00 ext cab sport, getting codes p0122, p1693 anyone know the meanings? twicw truck wouldnt start and the lift pump wasnt working, after letting sit it mysteriously did
 

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just google the codes and you should find what you need
 

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P0122 Accelerator Position Sensor (APPS) Signal Voltage Too Low.
APPS voltage input below the minimum acceptable voltage.

Best I can recall, this is the death code for an APPS. You can try unplugging and plugging it back in a few times then do the APPS reset.
If all fails, Timbo has our APPS reasonable,

Timbo APPS
 

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Discussion Starter #5 (Edited)
mysterious

could a bad crank sensor cause the low voltage? possibly causing my lift pump to mysteriously not work sometimes? lift pump and vp44 are new 5000 miles ago. every now and then the tach will drop to nothing then come backup and cruise has mind of its own, someone told me this could be caused by the crank sensor
 

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The truck computer-PCM, sends 5vdc to the sensors/APPS in this case and depending on the position of the throttle, gets a voltage sent back. When it doesn't get a voltage back or the wrong anticipated voltage, it'll set a DTC.
A bad wiring connection can also set these low signal/no signal codes, that's why the connector to the APPS needs checking and APPS reset.
All help gratefully accepted.
 
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