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P 0129

 
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  #1 (permalink)  
Old 14 Jan 2004, 11:47 pm
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Default P 0129


I was getting a last minute chore done before packing the car and driving to Atlanta Georgia, when my check engine light came on and stayed on. I checked the code and it was
P 0129.


I went to my Chrysler dealer who said the earliest they could look at it will be Monday. (5 days from now), but they thought it would be O.K.to drive it as it is.


Does anybody know anything about P 0129, and would you drive it like that???


Thanks.
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Old 15 Jan 2004, 12:27 am
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p0129 is barometric pressure out-of -range . Three's 3 pages of debug and fru calls of map sensor,pcm,5 volt power supply,and wiring . As far as driving is the car idling/running correctly ? The diag needs DRBIII and a special interface to probe circuits with.
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Old 15 Jan 2004, 01:51 pm
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flashbk2,


Thanks for your answer.

The car is running fine, but I'd hate to get halfway to Atlanta and have it start to have trouble.


What part of the car has barometric pressure?

(I can't help but think that the onboard computer has made cars more fragile.)


Thanks.
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Old 15 Jan 2004, 01:55 pm
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Where in Atlanta are you going? I live just SW of Atlanta.

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Old 15 Jan 2004, 02:16 pm
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This sounds like a map ( manifold absolute pressure) Sensor issue. Check you vacuum lines first, because that sensor reads ambiant out side pressure and vacuum / boost of the intake manifold. If you have a leak, this could cause it to read out of range.

Try disconecting the battery, waiting at least a half hour and then repluging it in. this will at least clear the code if it is a minor glitch. It may cause the auto trans to shift funny for a while, it will need to relearn it shift protocol. I can tell you more about that if you want.

If it was minor it won't return, if it is a true problem, it will set the same code. also if the light is on, you have entered limp-in mode, the computer starts to use adaptive strategy to account for missing sensor info. It will usually run richer, retard timing, and cut boost. I wouldn't let it go if it is a true map sensor problem.

Tom
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Old 15 Jan 2004, 06:47 pm
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Hi Tom,

Thanks for the info. I haven't driven it since the light came on, but have been riding in my sisters '03 Steel Blue Limited all day.

If I disconnect the battery, the transmission has to relearn shift protocol??? Wow, Computers really have made cars more fragile!

As much as I would like to learn "on the job" how to fix my Cruiser, I think I'll let the pros do it. It's not like the old days when cars were simple to work on. I hope it doesn't go into "limp mode" when I drive it to the dealer on monday.

________________________________




TripleJackInGA,


I have business in Marietta, North of Atlanta. I've had "Essential Care" done at both "Ed Voyles Chrysler" and "Stone Mountain Chrysler". Who do you do business with?

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Old 15 Jan 2004, 07:05 pm
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Well, in Marietta, I have bought a car form Marietta Dodge before, although I can't vouche for the service.The sales people handle themselves well.I know Hayes Chrysler is good too from others, but they're over in Lawrenceville and Gainesville (both up I-85 North and I-985 North.
I bring my PT to Andy Lewis Dodge in Newnan (Southside) where I live.I prefer to bring it there versus the local Chrysler dealer as the Dodge place is 5-Turd Certified.

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Old 15 Jan 2004, 07:11 pm
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"Computers really have made cars more fragile"that is an understatment!!

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Old 16 Jan 2004, 12:48 am
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EMAIL:



There's nothing wrong with your car, it's a software problem. P0129 will set if you "drop the key" during startup. This means that you stop cranking at precisely the same time the engine fires. The engine may start somewhat then spins backwards for 1 or 2 revolutions. This sends pressure into the manifold right when it takes a BARO sample. The pressure it sees is too high so it sets P0129.


There's a TSB which informs the dealer to re-flash your car with revised PCM SW.




--------------------------------







That's Great news!!! Thanks! I really appreciate your taking the time to help. I Love it when I can go to the dealer knowing exactly what's going on, instead of being at their mercy.




--------------------------------


Does anybody have a link to the TSB? (My Web-TV can't open PDF files.)


--------------------------------



Thanks Again!
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Old 17 Jan 2004, 11:44 pm
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The TSB # is 18-018-03, dated April 25, 2003.


Here's some text from it:


SUBJECT:
Flash: MIL Illumination, Erroneous Diagnostic Trouble Codes (DTCs)


OVERVIEW:
This bulletin involves selectively erasing and reprogramming the Powertrain
Control Module (PCM) with new software.


MODELS:
2003 (PL) Neon/SX 2.0
2003 (PL) SRT-4
2003 (PT) PT Cruiser


NOTE: THIS BULLETIN APPLIES TO PL VEHICLES EQUIPPED WITH A 2.0L ENGINE
(SALES CODES ECB OR ECH) OR A 2.4L ENGINE (SALES CODE EDV) BUILT
ON OR BEFORE MARCH 31, 2003 (MDH 0331XX) AND PT VEHICLES EQUIPPED WITH A 2.0L ENGINE (SALES CODE ECC) OR A 2.4L ENGINE (SALES CODE EDZ
OR EDV) BUILT ON OR BEFORE APRIL 28, 2003 (MDH 0428XX).


SYMPTOM/CONDITION:

Vehicle operator may experience MIL illumination.


Technicians may find the following DTC(s):

P0071 - Ambient Temperature Sensor Performance.

P0111 - Intake Air Temperature Sensor Stuck.

P0116 - Engine Coolant Temperature Performance.

P0129 - Barometric Pressure Out of Range - Low (Turbo only).

P1115 - General Temperature Sensor Performance.


DIAGNOSIS:
Using a Scan Tool (DRBIIIĀ®) with the appropriate Diagnostic Procedures Manual,
verify all engine systems are functioning as designed. If DTCs are present,
other than those listed above, record them on the repair order and repair as
necessary before proceeding further with this bulletin.

If the vehicle operator describes or the technician experiences the Symptom/
Condition, perform the Repair Procedure.
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