Jeep just shut down while driving - P0320, P1299, & P1391

Nabis · 05-04-2009, 10:48 AM

Just driving down the road, and all the power cut. The rpm needle went to max once or twice (although the engine was off). Tried to start it a few times, and would turn over ok, but wouldn't fire. After cranking, it came to life a little while chugging - Seemed to get better with a few minutes of idleing.
Got it back home and parked it for a few days. Started up perfect and idled perfect for a few minutes, so I decided to take it down the road - Only got about a mile, and same thing, just shuts down.
Pulled the codes and this is what I got:
P0320 (M): No Crank Reference Signal at PCM - No reference signal (crankshaft position sensor) detected during engine cranking.
P1299: Vacuum Leak Found (IAC Fully Seated) - MAP Sensor signal does not correlate to Throttle Position Sensor signal. Possible Vacuum Leak.
P1391 (M): Intermittent Loss of CMP or CKP - Loss of the Cam Position Sensor or Crank Position sensor has occurred. For PL 2.0L

Question is, I'm thinking it's the Crank Position Sensor (CKP), which can be had on RockAuto for about $30, but should I also throw more parts at it like the cam position sensor (another $30)? Or is somebody quite certain it's one without the other?
And what about the P1299 error? Was this just a byproduct of one of the other errors, or should I be looking into another sensor (MAP?)

Brandle · 05-04-2009, 01:55 PM

Nabis............

It appears to be the Crank/Cam position sensor. Usually testing codes from the bottom up, is the generally a good idea. The last code is usualy the one which activates the other codes.

Nabis · 05-04-2009, 02:46 PM

Are you suggesting replacing both sensors? Not that they're terribly expensive, I was just thinking that somebody would know it to be the crank OR cam, not just both. Is there any way to get a detailed code for the P1391, stating a problem with one or the other?
I only got these codes from the on/off method.

craddock01 · 05-04-2009, 05:01 PM

Crankshaft sensor probably not both put that one in first.

Nabis · 07-16-2009, 07:23 AM

Replaced the crank sensor, and all was good for quite a while (Although is was a serious PITA to change - Made a different thread just for that).
The CEL now came back on, and shows just the P0320. What should I change or look for next? Crank Sensor wires shorting somewhere, Cam sensor, something else?

**ratmonkey** · 07-16-2009, 01:01 PM

where did you get the crank sensor? aftermarket sensors don't seem to agree with jeeps.

BLKSVT · 07-17-2009, 09:57 AM

TPS and clock spring cured all my problems...for some reason it affects alot and throws many codes...just my .02

Nabis · 07-31-2009, 05:20 PM

I'm pretty sure I got the Crank Sensor from Rockauto.
What necessitated replacing the clock spring?.. it's a fairly expensive part, so I'd like to make that my last resort. Is that a common issue/fix?
Although, I plan to replace both the cam sensor and tps soon.

Rhinoguy · 03-06-2010, 05:54 PM

Quote:

Originally Posted by Nabis

I'm pretty sure I got the Crank Sensor from Rockauto.
What necessitated replacing the clock spring?.. it's a fairly expensive part, so I'd like to make that my last resort. Is that a common issue/fix?
Although, I plan to replace both the cam sensor and tps soon.

Did you get this figured out? I'm having the same issues on my WJ. Replaced the crank sensor (oem), then the cam sensor (aftermarket) Still getting these codes and a bit of stalling, especially in reverse, put it in reverse and it just dies

Matchbox · 03-26-2010, 06:56 PM

Quote:

Originally Posted by Nabis

I'm pretty sure I got the Crank Sensor from Rockauto.
What necessitated replacing the clock spring?.. it's a fairly expensive part, so I'd like to make that my last resort. Is that a common issue/fix?
Although, I plan to replace both the cam sensor and tps soon.

I'm having the same problems iwth my Jeep Liberty. It stalls randomely. Engine light go on sometimes. Always gave me the code P0320 and once it also gave me the code P1391. I just replaced the crankshaft postion sensor (oem), and it stalled 3 times on the way home. The OBE2 said P0320 again only. Does anybody have any itmes what it could be? I don't

Rhinoguy · 03-29-2010, 04:53 PM

I was getting the same codes, replaced crank sensor and cam sensor to no avail. Turned out to be a bad vacuum line from the intake to the manifold. Check the two hoses on either side of the engine that go to the intake. Any kinks or cracks will give crank error

Nabis · 05-06-2010, 09:26 AM

Good advice, I'll take a look at that.
My GC doesn't get much use, so I'm not sure if the problem is fixed, as the stalling was so intermittent.
Matchbox, did you get yours fixed up?

autopc25 · 02-01-2011, 10:55 PM

I have a 1997 2.5L ,auto.

I got the same symptoms and P0320 first then P1391 second. Ran fine, sputtered, died. Let sit a few minutes and it started up died again. After sitting for another 5-10 minutes it started up and I was able to drive it a mile to a garage and parked it. Anyone figured this out?

I got a Autozone crank position sensor and installed it and it started right up. I asked for a cam position sensor just in case but Autozone did not have one for a 1997 2.5? I had to buy the entire distributor with the sensor in it already. I did not install the distributor yet. I plan on doing it tomorrow in the morning. Anything tricky about replacing the new distributor?

dainger_us · 07-30-2011, 11:50 AM

Our 03 Jeep Liberty will usually start and run fine for about 10 minutes, then it stalls out while going down the road and the RPM gauge bounces?? if we let it sit for about 10 minutes then it will run for another 10 minutes before doing the same thing. Sometimes after it dies and we try and start it we can smell gas or something!! any help??

autopc25 · 07-30-2011, 08:02 PM

My problem was a bad crank position sensor. The wire for it was dangling and touching the exhaust. There was a very small spot where it was melted through the rubber insulation to the bare wire. It was very hard to see the melted wire.