Reductant Heater Codes
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5th Wheeling
Joined: Sep 2020
Posts: 26
Likes: 8
Reductant Heater Codes
Happy New Year all. Haven't posted in awhile but I questions someone here may be able to help with. Checked related threads and other sources but no help.
2020 F250 6.7L.
Truck recently displayed a CEL, Forscan found: P221C:00-AC (as displayed by Forscan); OBD2: P221C-C. My question is: is this for the heated pressure line or the "in tank" pump heater? The heated pressure line resistance measured 4 ohms. The "in tank" heater resistance measures 1.7 ohms. Does anyone know the resistance specs?
Another code set is B11F0:14-28. Air intake damper position sensor: circuit short to ground or open. This relates to the cabin heater fresh air/recirc door. Where can I measure and locate this?
Thanks in advance for any feedback.
2020 F250 6.7L.
Truck recently displayed a CEL, Forscan found: P221C:00-AC (as displayed by Forscan); OBD2: P221C-C. My question is: is this for the heated pressure line or the "in tank" pump heater? The heated pressure line resistance measured 4 ohms. The "in tank" heater resistance measures 1.7 ohms. Does anyone know the resistance specs?
Another code set is B11F0:14-28. Air intake damper position sensor: circuit short to ground or open. This relates to the cabin heater fresh air/recirc door. Where can I measure and locate this?
Thanks in advance for any feedback.
Fleet Mechanic
Joined: Oct 2022
Posts: 1,822
Likes: 898
From: Dallas Metroplex
1st Gear
Joined: Mar 2025
Posts: 1
Likes: 0
my 17 also has p21dd currently. Is the heater built into the pump? I crawled under today and a saw the pump. And thought the heater was separate right beside it? But I can’t seem to find just a heater part number?
Hotshot
Joined: Mar 2014
Posts: 10,750
Likes: 1,065
From: Douglassville, PA
I was also unable to find just the heater for my 2019 and I believe the heater and pump are one, $1400 unit. Mine was fixed under warranty though so I never got my hands on it. With mine, the GPCM turned out to be the culprit. it apparently sends the signal for the heaters to come on. And some ask why people would just rather delete the whole mess.
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