Go Back   Hummer Forums - Enthusiast Forum for Hummer Owners > Hummer Lineup > Hummer H2
Sign in using an external account
Register Forgot Password?

Welcome to the Hummer Forums - Enthusiast Forum for Hummer Owners.
If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

LinkBack Thread Tools Search this Thread
Old 02-15-2011, 06:50 PM
Senior Member
Join Date: Feb 2007
Posts: 151
Default Check Engine Light Only Comes on when its cold

So this only happens to me when my truck is left outside over night and it is cold, say 20 or below....

When I start the truck my CEL light comes on and 2 codes are tripped... P0573 Brake switch and P1400 Differential Pressure Low. If I immediately clear the codes and restart the truck, no codes.

Any have any ideas on why the cold may cause this to happen? Dealer say everything checks out.

This ad is not displayed to registered members.
Register your free account today and become a member on Hummerforums!
2008 Black H2
Reply With Quote
Old 02-17-2011, 05:49 PM
Senior Member
Join Date: Dec 2009
Posts: 166

Your PCM goes through phases where it does self testing. So the codes won't come back right away. And those codes are hell too figure out. I see why the dealer didn't tell you the why it is doing that. Especially the brake switch code.

Last edited by luda81; 02-17-2011 at 05:51 PM.
Reply With Quote
Old 02-17-2011, 05:49 PM

2009, cel, check, checkenginelightcomesonwhenitscold, cokd, cold, engine, h2, hummer, ingine, light, lights, outside, p1400, service, side

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Featured Sponsors
Vendor Directory
Our Sponsors
All times are GMT -5. The time now is 04:06 PM.

Internet Brands, Inc.