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Old 02-17-2020, 11:42 AM   #80
hatzie's Avatar
Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,479
Re: Hatzies 2005 2500HD

Whelp. The money light came on this AM.
P0449 Evaporative System Vent Control Circuit Malfunction.

The PCM monitors the voltage through the vent valve wiring loop from the fuse panel. Either the vent valve solenoid coil or the wiring to the vent valve is open.

I'll edit this post with what I find.

My test method will be to energize the vent valve using my Tech 2 with a Metripak 150 to 168 Peanut bulb test light inserted into the Vent Valve connector. My test lamp is a molded 168 peanut bulb socket pigtail that I crimped Metripak 150 terminals to the wire ends as a PCM solenoid driver safe test lamp. Real low tech.
If proper volts are coming from the PCM and the Metripak connector isn't full of green puss I'll change the valve out. Otherwise I get to fix the wiring.
1959 M35A2 LDT465-1D SOLD
1967 Dodge W200 B383, NP420/NP201 SOLD
1969 Dodge Polara 500 B383, A833 SOLD
1972 Ford F250 FE390, NP435/NP205 SOLD
1976 Chevy K20, 6.5L, NV4500/NP208 SOLD
1986 M1008 CUCV SOLD
2000 GMC C2500, TD6.5L, NV4500
2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263
2009 Impala SS LS4 V8

RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...Please include at least the year and model in your threads. It'll be easier to answer your questions.
And please let us know if and how your repairs were successful.

Last edited by hatzie; 03-01-2020 at 09:01 PM.
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