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Discussion Starter #1
Car would not start easily like before. Long cranks and sudden starts, but once shifted to D/R, accelerator is non-responsive at all (thanks drive-by-wire). Here are the following DTCs that returned from the DTC report:

P0335 - Crankshaft Position Sensor A Circuit Performance
P0642 - Sensor Reference Voltage 1 Circuit Low
P2122 - P2122 Accelerator Pedal Position (APP) Sensor 1 Circuit Low Voltage

** google searched the codes, I'm assuming that's the closest ones matched.
 

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Hrm damn. I'll see what I can find.

Generic OBD2 response...

A P0335 "check engine light" code could be caused by: Damaged CKP sensor connector Damaged reluctor ring (missing teeth or not turning due to sheared-off keyway) Sensor output open Sensor output shorted to ground Sensor output shorted to voltage Failed crank sensor Broken timing belt Failed PCM

Read more at: http://www.obd-codes.com/p0335
Copyright OBD-Codes.com
 

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Get the battery and grounds checked first.

They cause very weird often seemingly unrelated problems in these vehicles sometimes.

Check/change crankshaft position sensor.
Check out camshaft position sensor as well as they are related.
 

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Discussion Starter #4
Anyone want to chime in and let me know where exactly this sensor is located? Driver side above the starter OR passenger side, right above the oil pan (near the transmission)? Referring to the Crankshaft Position Sensor here... for 06 XK HEMI (5.7L) ... please help, thanks!
 

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Anyone want to chime in and let me know where exactly this sensor is located? Driver side above the starter OR passenger side, right above the oil pan (near the transmission)? Referring to the Crankshaft Position Sensor here... for 06 XK HEMI (5.7L) ... please help, thanks!
Have you had the battery tested?
 

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Discussion Starter #6
Have you had the battery tested?
Yes of course, it has been tested and powers at par to new battery; it's only like 5mths old too. I just need to replace that Crankcase Position sensor, but can't tell thus far yet if it's located on which side.
 

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http://www.wkjeeps.com/wk_cam_sensor.htm



http://www.schematicsdiagram.com/2011/05/how-to-replace-crankshaft-position.html

5.7L V8 Engines
The crankshaft position sensor is located at the left rear of the engine just above the starter motor. The sensor detects the crankshaft position without contact (Hall effect) by means of missing segments on the tone wheel behind flex plate. The electronic control module (ECM) detects TDC position of cylinder 1 by means of the signal supplied by the sensor. Injection timing is synchronized by means of the camshaft signal and the crankshaft signal. This sensor is used to detect engine speed.

When the crankshaft rotates, an alternating voltage is generated in the crankshaft position sensor by the gaps of the tone wheel located behind the flex plate. In this case, the metal portion of the tone wheel generates a positive voltage pulse and the gap in the tone wheel a negative voltage pulse. The distance from the positive to the negative voltage peak equals the length of the gap.

The gap created by 3 missing teeth has the effect that no voltage is generated in the crankshaft position sensor. The ECM analyzes this gap, or time, without a signal from the crankshaft sensor, in order to detect the TDC position of cylinder 1.
 

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Discussion Starter #8
I eventually spotted the crankcase positioning sensor on the passenger side of the engine, about 2 inches from the transmission bell housing, and two inches above the oil pan. I replaced that... I was getting the code still for a while (P0335)...but after all this rain we had, it finally cleared outside.

So I disconnected the battery and reset the CEL code. Tried to start it again, although this time it sounded better when trying to crank, as if it was trying to start-up on the get-go. Unfortunately, still a struggle and the only codes I get now are:

P0642
P2122

I'm hoping it's something easier now... supposedly it almost implies it's the throttle/pedal position sensor/switch D Circuit low input.

Thoughts?
 

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Discussion Starter #9
UPDATE: After narrowing down the link between the throttle body/TPS > Oil Pressure Sending Unit > Crankcase Positioning Sensor... realized the OPSU was sticking out crooked. Long and behold that was causing the weak/low voltage to the associating sensors. Replaced this before about two year ago.

I had tried resetting the CEL & relays, only to then see the P0520 pop up on the DTC, which reminded me exactly what was that. Since replacing it, the HEMI is alive again :)
 
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