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GL Class (X164) 2007-2012: GL320CDI, GL420CDI, GL450, GL550

ODB reader gave me the P0444 code

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Old Aug 19, 2013 | 08:13 AM
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hmillham
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2008 GL 320 CDI
ODB reader gave me the P0444 code
Driving 2008 GL320: My Check engine light came on then about 5-10 sec. later the Glow plug light came on, all while the car stated normal. So I attached my ODB reader and it gave me the P0444 code. I thought glow plug issues were in the P0600's series. Anyone have any ideas?
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Old Aug 19, 2013 | 10:03 AM
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Originally Posted by hmillham
Driving 2008 GL320: My Check engine light came on then about 5-10 sec. later the Glow plug light came on, all while the car stated normal. So I attached my ODB reader and it gave me the P0444 code. I thought glow plug issues were in the P0600's series. Anyone have any ideas?
p0444 is pretty much the system telling you it cant maintain proper vacuum in tank.

lowest hanging fruit is check gas cap

other culprits are more involving and require das readout
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Old Aug 19, 2013 | 10:30 AM
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Thanks...I'll check the gas cap now. That might make since I had just filled her up.
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Old Aug 19, 2013 | 08:31 PM
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2008 GL 320 CDI, 2004 VW V10 Touareg TDI
If you have a gas cap then you are in a world of hurt! Diesel only please!

Not at all sure that a vacuum is required on the GL 320.
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Old Aug 20, 2013 | 06:32 AM
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Hahaha...opened and reclosed the RED diesel thing-a-ma-gigigy and the light'S when out. Its all good now
Thanks for all the help...I love this place!
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Old Aug 20, 2013 | 11:25 AM
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Originally Posted by Fourdiesel
If you have a gas cap then you are in a world of hurt! Diesel only please!

Not at all sure that a vacuum is required on the GL 320.
there is always vacuum as this is how leaks are detected.

no vacuum = leak.

leak = bad
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Old Aug 20, 2013 | 12:08 PM
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Thanks ALX
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Old Aug 20, 2013 | 09:26 PM
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Originally Posted by alx
there is always vacuum as this is how leaks are detected.

no vacuum = leak.

leak = bad
I agree that if vapor leaks are bad then a vacuum switch is a good way to detect the problem
The reason I mentioned it is because there is no emissions reason for controlling diesel vapors as there is for gasoline vapors. Diesel has a much higher vapor pressure and the vapors that do come from diesel are not as harmful to the environment. Thus no emissions reason to alarm at the first sign of a leak. If the leak detection system exists on the diesels it is not for emissions reasons.
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Old Aug 20, 2013 | 09:44 PM
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Vacuum in diesel tank is monitored for one reason only- detect leaks.
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