I am working on a 2000 chevy 3500 with a 6.5l duramax td. when idling and driving around the city and highway the oil pressure is fine. the only time it acts up and drops to zero for a split second is when exiting the freeway while slowing down. I can not recreate the issue at any other time. i have already replaced the ops checked the gage by grounding it out and it all seems to work. i havnt never seen this and i am looking for ideas.

 

didnt know they made a 6.5 duramax. could be a bad oil pump

 

did you replace the OPS with ACdelco if not that maybe way when was the last time you change your oil and it could be bad filter i ran into that once it was bad filter

 

what year is the truck? i see 2004 then 2000

 

it is a 2000 i dont know why i put 2004 the oil has a 1000 miles on it and it should have of been acdelco i got it from the dealership but didnt pay attention to the brand. I am going to check into the filter issue because that may have of been when it started.

 

if you can get access to a scanner id go into the instrument cluster and watch displayed vs. monitored oil press. or hook up a temp. mech. oil gauge. the ecm monitors the oil press. and sends info. to the press. gauge. depending on how long the oil press. hits 0 you should be getting a dtc in comp. for something like oil press. sensor circuit low or something to that affect. replaced tons of instrument clusters on these trucks but never seen a prob with oil press. sensor or diff. filters.