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2012 337 def gauge

Discussion in 'Peterbilt Forum' started by Campmech, Apr 18, 2019.

Apr 18, 2019 #1

Campmech Bobtail Member

2

0

Apr 18, 2019

0

Hey group, I have a 2012 337 with a def gauge that reads empty all the time. Sending unit is new, gauge is ok. Wondering if tank being over full might cause this?

Campmech, Apr 18, 2019

Campmech, Apr 18, 2019

#1
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Apr 18, 2019 #2

Intothesunset Road Train Member

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4,880

Apr 15, 2019

truck

0

Faulty connection, or short perhaps?

Intothesunset, Apr 18, 2019

Intothesunset, Apr 18, 2019

#2
Apr 18, 2019 #3

Campmech Bobtail Member

2

0

Apr 18, 2019

0

The connections at gauge and sending unit are ok. I probably need to check the harness. Anyone have a wiring diagram?

Campmech, Apr 18, 2019

Campmech, Apr 18, 2019

#3
Apr 18, 2019 #4

pushbroom Road Train Member

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7,403

Sep 1, 2012

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Is the unit deleted by any chance?
If it shows empty with no check engine light on, I would suspect its deleted or improper programming in the CECU.
Proper software is needed to accurately diagnose/fix this

pushbroom, Apr 18, 2019

pushbroom, Apr 18, 2019

#4

spsauerland Thanks this.