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Weird code P050B

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Old 20 Jan 2014, 07:57 pm
Fresh Cruiser
Join Date: Apr 2008
Location: Upstate, NY
Posts: 26
Default Weird code P050B

Has anybody ever encountered this code before? Took the car to the shop today to have them help me diagnose this, and they'd never seen this particular code before. Doing my own research, it refers to cold start ignition performance, but we're at a loss on how to troubleshoot. The car has been idling unusually low lately, around 600-650rpms cold. When applying the clutch to stop, the rpms will drop quickly and sometimes the engine might stumble a bit. I had the throttle body taken off and cleaned, including the IAC valve. The car now seems to idle a bit smoother, and the code hasn't come back... waiting to see what happens tomorrow morning when I start it. Does anybody have any suggestions?

2006 Base, 5-speed, 146k miles.
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Old 20 Jan 2014, 08:27 pm
randyincctx's Avatar
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Join Date: Jun 2013
Location: Corpus Christi,Tx.
Posts: 3,485
Lightbulb Re: Weird code P050B

Looks like you may only be the 2nd,or 3rd person to report this code.
A similar issue (and code) was mentioned in a thread last year,and for one member it turned out to be a broken wire leading up to the MAP sensor,and bad wires on the throttle position sensor.

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2003 PT Cruiser (Base-N/A) Patriot Blue Pearl Purchased @ Police Impound Auction for $1,000.
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Old 21 Jan 2014, 10:51 am
Fresh Cruiser
Join Date: Apr 2008
Location: Upstate, NY
Posts: 26
Default Re: Weird code P050B

Thank you! I reread everything from that thread, the problem was similar yet different then mine. After cleaning the throttle body and idle air valve, at -3 degrees F this morning, the car started and came to life a lot smoother then it has in several years now. I'm hoping that is what may have been triggering the code.
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