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Crazy engine faults

650 views 3 replies 2 participants last post by  Scouter 
#1 ·
I get a call from my wife that her 2005 TJ Rubicon just set a check engine light.
4.0, manual. Codes, P0032,P0038,P0052,P0058. All 4 O2 sensors, with the same code, at the same time. Heater circuit high.
All new sensors about 3 months ago, NKG, swapped when I replaced cats. Looked underneith everything good. I will check grounds today. Reading online, I learned about the computer problems plaguing the 2005, 2006 model years.
For those that are familiar with this issue, new computer time?
If so, what to look at and what to steer way clear of?
 
#2 ·
If lucky it is a ground or shorted harness wire but the 06/06 TJ use the NGC PCM which has know heat issues effecting the oxygen sensor heat circuit

On my wife’s 04 PT turbo cruiser after 13 years of ownership since new it first set codes for both oxygen sensor circuits high (only has one pre and one post sensor as a four cylinder and it used that same crappy failure prone NGC PCM) and would occasionally go into limp mode until a PCM reset
But problem was only every week or so and got thru emissions as after reset and monitors ready went straight to emissions, and after passing CEL popped back on for drive home

Almost no one carries the NGC computer as most have failed esp in turbo cars with higher under hood heat)

Got replacement and it immediately popped codes for sensor heater circuit low (change from high before so proved it was PCM)again both
But at least no limp mode and ran fine

Finally got another pcm and so far no codes and runs fine

Bottom line with all heater circuits hope for ground or harness issue but if 05-06 TJ probably the crappy PCM

Try to get it fixed and try to never again buy an 05 or 06 TJ

I will never buy any vehicle with PCI bus and NGC PCM as it is just a matter of time before failure


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#3 ·
Refreshed The grounds at the block and battery. It drove around fine today with no check engine light. Warmed it up this afternoon and took a drive, and 1 mile down the road the light came back on. The Jeep has no drivability issues, just the annoying light.
 
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