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KCT 07-28-2005, 01:19 PM What would cause a truck with the zf-6 to shutdown at approximately 1900-2000 RPM? I was pulling a short but steep hill on my way home. Edge set to 1/1 3rd gear 2800 rpm before it should down. 30' tandem gooseneck in tow GCVW above 21000 lbs. Max Payne 07-28-2005, 01:54 PM How is your fuel filter? GMC2500HD 07-28-2005, 03:42 PM Might be fuel filter and might be the dreaded overboost code.. KCT 08-08-2005, 10:54 AM I replaced the fuel filter about 1500 miles ago. I was on vacation last week pulling a small 19 foot deck boat. It pulled to kentucky lake just fine but went into limp mode 5 times between St. Louis and kansas city on the way home. Each time I was not even at full throttle. precision37 08-08-2005, 11:53 AM How's your MAF sensor? I saw in your sig that you had a K&N air filter. Excess oil from the filter can coat the MAF and cause problems. Also, open the drain on the WIF sensor (bottom of fuel filter) and pump the primer a few times and collect a fuel sample in a glass and see what it looks like. KCT 08-15-2005, 02:02 PM Well, I cleanded the MAF again last night. about 12 miles from home it went into limp mode 3 times while pulling about 6k lbs. It did not go into limp mode unloaded. | ||