Engine Codes PO320 and PO455 - Help ??? - Jeep Wrangler Forum
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Old 11-07-2009, 07:25 AM   #1
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Engine Codes PO320 and PO455 - Help ???

Last night I started the 2002 Jeep TJ with 4.0 and Manual. Engine light came on and stayed on. Checked this morning and codes PO320 and PO455 came up. According to manual it indicates the following:

P0320 (M) No Crank Referance Signal at PCM
No reference signal (crankshaft position sensor) detected
during engine cranking.

P0320 (M) No RPM Signal to PCM (Crankshaft
A CKP signal has not been detected at the PCM
Position Sensor Signal to JTEC)

P0455 (M) Evap Leak Monitor Large Leak Detected A large leak has been detected in the evaporative system.

So where do I go from here. What do I check.

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Old 11-07-2009, 07:35 AM   #2
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evap leak usually means your gas cap needs to be on tighter or you need a new gas cap...not sure on the codes.

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Old 11-07-2009, 09:37 AM   #3
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were there any changes prior to getting this morning's codes ?

recent service, fill gas tank, etc....
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Old 11-07-2009, 10:33 AM   #4
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No.

I went and filled the tank this morning and then checked the codes again. Only the PO320 Code came up so 455 code must have been the gas cap.
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Old 11-07-2009, 10:55 AM   #5
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I don't have a manual that came with my jeep, is there a thread anywhere on here where someone has posted all the codes and what they refer to ?
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Old 11-07-2009, 10:56 AM   #6
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Oops, disregard, I found it under the stickies at the top....... Sorry
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Old 11-07-2009, 01:10 PM   #7
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Ok - The engine light went out. Jeep was running and driving fine even with the light on.
Was this a blip or what?

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