Randomly dying, and then...


Tjunk

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May 4, 2021
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Dallas Texas
So my beloved 2005 TJ(Rocky Mountain Edition 6-speed/4.0l) died a couple times in traffic(idling usually). I'd just start it back up, and be on my merry way. On day three of this jazz, it sputtered a little before dying. It threw a P-0335(Crankshaft Position Sensor) code, so I stopped to get one on my way home. Swapped it out in the driveway, but it kept dying upon a quick test-drive. Now suddenly I'm getting five codes. P-0016(Cam sensor/Crank sensor out of sync), u-0155(Lost Communication with Gauge Cluster), P-0508(Idle Air Control Valve), P-0344(PCM detected Camshaft Sensor failure), and P-0355(Crankshaft Position Sensor Error). I've read so many possible remedies, I could almost buy a new Jeep for the sum of it all. Alternator, battery, Camshaft Position Sensor, PCM, new Gauge Cluster, plugs, wires, and nearly everything else. Anyone got any experience with this sort of thing? I work too far to walk everyday, and I don't make enough there to buy another vehicle either. Luckily I'm handy, and I have ALL the tools, just no idea what to throw at it next. Anyone got a lead on this?
 
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Tranz Zam

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Jan 13, 2019
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713
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MA
Randomly dying is a crank position sensor, but with all the other codes you're now throwing, it sounds like the pcm is dying.

05-06 TJs have that issue. That's where I'd start.
 
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Tjunk

Tjunk

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Man, I was really hoping some other suggestions would pop up. It's high-dollar, but cheaper than a new Jeep I suppose. Thanks.
 

CharlesHS

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Mar 10, 2020
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Before assuming the worst... I would check the easy things first.
Disconnect the 32 pin harness connectors from the ECU and check for oxidation on the pins and clips. Loose or oxidized connections can cause similar problems. When you reconnect the harness connectors; firmly snap the connectors onto the ECU.
Then check the ground connections on the block to the left of the oil filter for a loose or dirty connection.
 
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Tjunk

Tjunk

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May 4, 2021
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Dallas Texas
Before assuming the worst... I would check the easy things first.
Disconnect the 32 pin harness connectors from the ECU and check for oxidation on the pins and clips. Loose or oxidized connections can cause similar problems. When you reconnect the harness connectors; firmly snap the connectors onto the ECU.
Then check the ground connections on the block to the left of the oil filter for a loose or dirty connection.
Gonna try that tonight, but if it don't work I'm ordering a PCM.
 

Jeepr89

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Nov 16, 2020
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Location
Lincoln, NE
Check and see if you have the 5volt reference from the computer at those sensors. Then check for it at the computer. You can unplug the sensors one at a time and see if the 5volt reference comes back. If you narrow it down to the computer reach out to @Wranglerfix. He just helped me with a computer for a customers 97 that lost it’s 5 volt signal.
 

Wranglerfix

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@Tjunk Without question hesitation or fail your pcm is going bad. Driving and dying and faulty o2 sensor codes are the two main culprits.

once the engine is hot take a mallet and tap on the Pcm and it should die.

You can call me at 866-888-7710 to discuss in further detail.
 
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Tjunk

Tjunk

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@Tjunk Without question hesitation or fail your pcm is going bad. Driving and dying and faulty o2 sensor codes are the two main culprits.

once the engine is hot take a mallet and tap on the Pcm and it should die.

You can call me at 866-888-7710 to discuss in further detail.
You were already the guy I was going to call, just based on everything I've read about similar situations thus far, as well as your reputation in the community. The one year warranty doesn't sound good, but I haven't found anyone saying they regret your services either. I'm going to check out the connections, but considering the codes I got, everything kinda points to the PCM. Sucks fat hole, since I'm barely scraping by, but I need this thing back on the road bad.
 
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Tjunk

Tjunk

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May 4, 2021
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Dallas Texas
@Tjunk Without question hesitation or fail your pcm is going bad. Driving and dying and faulty o2 sensor codes are the two main culprits.

once the engine is hot take a mallet and tap on the Pcm and it should die.

You can call me at 866-888-7710 to discuss in further detail.
You were already the guy I was going to call, just based on everything I've read about similar situations thus far, as well as your reputation in the community. The one year warranty doesn't sound good, but I haven't found anyone saying they regret your services either. I'm going to check out the connections, but considering the codes I got, everything kinda points to the PCM. Sucks fat hole, since I'm barely scraping by, but I need this thing back on the road bad.
 
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Tjunk

Tjunk

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May 4, 2021
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Dallas Texas
Also, my o2 sensor codes have been coming and going at random for a year or so, as they please. I bought NGK sensors/exhaust system, and all sorts of other stuff, but it's been collecting dust in the garage since the codes were just intermittent for the time being. Could that have been a PCM thing the whole time, and it's just now taking a dump on me?
 

AndyG

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Jul 30, 2018
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@Tjunk Without question hesitation or fail your pcm is going bad. Driving and dying and faulty o2 sensor codes are the two main culprits.

once the engine is hot take a mallet and tap on the Pcm and it should die.

You can call me at 866-888-7710 to discuss in further detail.
Just whisper “wranglerfix” to the pcm. It will shudder. He’s got ya man, it will be a -ok.