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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N47 and N57 Turbodiesel Engine / Drivetrain / Exhaust Modifications > P20BD code-reductant code?
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      01-10-2019, 04:06 PM   #1
mitchtr25068@aol.com
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P20BD code-reductant code?

On my 2014 328d, I’ve had check engine light on for weeks, and code reader says

P20BD
Reductant heater b
Control circuit/open
Permanent

Any thoughts on why/where/how and what to fix? I’ve never heard of a reductant heater and haven’t located it yet in my Bentley book. Thanks!
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      01-10-2019, 04:15 PM   #2
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See if you can get a code read with a tool that reads BMW manufacturer codes. P codes can be vague and sometimes misleading. Sometimes there are 2-3 detailed manufacturer codes to a single P code.
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-2014 328d Wagon 2WD, 8HP flash, self-tuned, 250hp/420ft-lbs.
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      01-10-2019, 06:39 PM   #3
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I do not have a 328d but I have a 335d. For the 335d it is either the AdBlue heater or the temperature sensor in the SCR tank (AdBlue)
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      01-19-2019, 07:54 AM   #4
mitchtr25068@aol.com
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I did more research on the code and found a company called xemodex in Canada that makes a urea heater and sensor repair kit, with the option to have them rebuild the system or do it yourself with a very detailed 30-plus page guide. Iíve got it in order and will report back

https://xemodex.com/us/product/def-s...-bmw-3-series/
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      01-19-2019, 07:07 PM   #5
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Did you check with them if it applies to the F30 chassis?
All those pics look like it's for the E90 335d.
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      07-08-2019, 09:30 AM   #6
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We have a 2015 X3d with the same issue. Lots of information on this code for other than BMWs. One common item we found was that this code should not exist unless it is cold out and DEF heater is attempting to turn on. This is happening at 80-90F. No symptoms other than check engine light is on. Got the permanent code to reset and check engine light turn off for a short period (50 miles). Threads for other vehicles indicate this is a programming issue, not a heater failure. Tried filling the DEF tank to overflow. Another suggestion was to drain the tank, refill with warm water to dissolve salts that can form. Any additional thoughts?
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      07-08-2019, 10:29 AM   #7
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A circuit error is most definitely a broken connection or a fault with the component described.

Do you have any additional codes?
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      07-09-2019, 12:32 PM   #8
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80518A and 244800 show up sometimes. Not permanent codes.
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