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Duramax Fifth Generation: 2011-2016 (LML) Discuss the fifth generation (2011-2016) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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Old 03-19-2020, 10:42 PM   #1 (permalink)
Blackcloud13
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P205b plus some

2011 LML LTZ 190K. Iím getting the P205b code plus some other weird problems. Iíve cleared the code a few times but when I turn on the turn indicators the dash immediately gives me the ďblinker onĒ warning with the audio beeping. Occasionally Iíll get a ďservice traction controlĒ as well. The DEF tank heater was already serviced by the dealership at 70Kish miles. I was having the same problems last year when PCM failed and the transmission would not shift so Iím on my second PCM. Anyone have any clue why I would get the p205b, blinker warning and service traction control warning? Thanks.

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Old 03-20-2020, 11:43 PM   #2 (permalink)
rob1
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Service traction control could be unrelated, can you scan the brake control module and see if there’s any codes there? Likely cause for the P205B is a failed temperature sensor in the DEF reservoir. The reservoir isn’t the tank itself, think more like a fuel tank sending unit. Lots of sensors and electronics in the reservoir, including level sensor, temp sensor, and heater #1. We replace lots of them at my dealer, but not as much in the last 6 months though. Used to be I’d do 2-3 a week, now I can’t remember the last one I did.

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Last edited by rob1; 03-20-2020 at 11:43 PM.
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Old 03-21-2020, 01:12 AM   #3 (permalink)
Blackcloud13
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I scanned it today when the check engine light came on. Says the P205B powertrain is a "pending fault" and P140A powertrain is a "historic fault".
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Old 03-25-2020, 09:49 AM   #4 (permalink)
rob1
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Wouldn’t worry about the 140A, that’s related to the EGR cooler bypass, that won’t cause a limp mode, and because it’s in history it’s not actually a hard failure. The 205B can probably cause a limp, I can’t access service information on my phone to check for sure though. All of the sensors in the DEF reservoir are prone to failure, you’ll just have to swallow it and have the reservoir replaced.

The code for the EGR cooler bypass valve will likely need a new valve, it’s located on the right side of the engine, at the far back. Brown connector with a yellow connector retainer. I have seen a couple times that the wires break inside the insulation near the connector because of the routing, something easy to check yourself. Give each wire a gentle tug individually and see if they fall apart.

Neither one of those codes will cause a traction warning or lamp, I suspect your code reader may not read codes set in the electronic brake control module.
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Last edited by rob1; 03-25-2020 at 09:51 AM.
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