2002 lb7 cold start then dies, sets codes P0900A U1800B - Diesel Place : Chevrolet and GMC Diesel Truck Forums
 
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Old 04-06-2012, 10:42 AM   #1 (permalink)
joshbaker
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2002 lb7 cold start then dies, sets codes P0900A U1800B

I have a 2002 K3500 duramax that will start fine when its warm. when the temperature drops below 40 it will start then cut off after running for a couple seconds, after restart it will shut off again. it sets codes P0900A and U1800B. After clearing codes it will start and run fine. Also after running a while it will surge periodically at idle 30 to 50 rpms. Any ideas?
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Old 04-08-2012, 10:34 PM   #2 (permalink)
dubs 06
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to me it sounds like your fpr maybe going bad surging at idle is a sign of a fpr going bad, fpr- fuel pressure regulator
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Last edited by dubs 06; 04-08-2012 at 10:35 PM.
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Old 04-09-2012, 09:48 AM   #3 (permalink)
joshbaker
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thanks, is there anyway to check a fuel pressure regulator?
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