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Engine Won't Start -- Code P0129

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Old 05 Jan 2008, 01:45 am
Fresh Cruiser
Join Date: Dec 2007
Posts: 5
Default Engine Won't Start -- Code P0129

I've fixed the engine in my 2003 PT, but I can't get it to start.
It was getting a code saying the MAP sensor input was too low, so I replaced it, and now it gets a P0129 code, barometric pressure too low.
I've searched and found this code there is for TSB for a GT (turbo) but mine isn't a turbo. In any case, I've also found that others still have a running car when they have the MAP sensor codes, yet mine won't start.
I could use some help, my chilton manual is useless here.
I checked the voltage at the MAP and throttle and air temp sensors, and I'm getting about 4.89V which seems OK. Any other ideas/suggestions?
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Old 05 Jan 2008, 02:10 am
Cool Cruiser
Join Date: Dec 2007
Posts: 369
Default Re: Engine Won't Start -- Code P0129

Have you checked to see if youve pinched or broken any wires leading to/from the map sensor? if the wires are ok, you might have a bad PCM. this is going by the diagnostic flow chart for code po129. if your car was able to run and you still had this code, the IAC system might have problems too.
06 Touring Edition NA/Auto. Airaid intake, Magnaflow Stainless cat-back exhaust, Taylor Thundervolt plug wires, rear lowered 1.75" with H&R Springs.
Yep, buying parts I cant afford with money I dont have to impress people I dont like anyways.
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Old 29 Apr 2016, 09:45 pm
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Join Date: Apr 2016
Posts: 9
Default Re: Engine Won't Start -- Code P0129

Any update on your issue as I have same code with crank no start after replacing the alternator and engine harness due to burnt positive ground from alt to starter which killed alt in the process...???
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