2011 Cascadia DD15 - ECU 128, Fail 02, PID 051

OK, SO I STARTED GETTING THIS CODE ABOUT A WEEK AGO; COINCENDENTLY AFTER I ADDED A LIGHTWEIGHT SYNTHETIC OIL TO THE EXISTING OIL; ADDED A GALLON TO REPLACE DRAINED OIL AFTER INSTALLING A FOMOTO DRAIN VALVE; BEFORE THIS, THE MOTOR HADN'T DROPPED OR BURNED A DROP OF OIL IN 15K MILES. AFTER A WEEK ANOTHER 3/4 GALLON LOW, ONE MORE WEEK AND IT NEEDED ANOTHER HALF A GALLON BUTS BEEN HOLDING A FULL LEVEL FOR THE PAST LAST WEEK AFTER ABOUT 2000 MILES. THE ENGINE LIGHTS AND ERROR CODES STARTED SHORTLY AFTER ME ADDING THE 2ND ROUND OF THE DIFFERENT OIL -DELVAC 1300 10/30 SYNTHETIC. SEEMS TO HAPPEN CONSISTENTLY WHEN OIL PRESSURE DROPS TO AROUND 40 AT IDLE. OCCASIONALLY HAPPENS AT HIGER REVS, PRESSURE AND SPEEDS BUT NOT STEADY. JUST DID A PM TODAY AND A FULL OIL SERVICE CHANGING OUT ALL OF THE OIL TO DELVAC 1300 10/30 SYN. PROBLEM STILL HAPPENING BUT ONLY VERY BRIEFLY AT IDLE/STOPS-SEEMS A LITTLE BETTER. SOMEONE SUGGESTED ADDING LUCAS TO GIVE THE OIL A LITTLE MORE WEIGHT. ANYONE HAVE THIS HAPPEN OR THINK THE CHANGES TO OIL TYPE/WEIGHT MAY BE RELATED TO THE PROBLEM? BTW, THEY FOUND NOTHING WRONG AT THE SHOP - SURPRISE, SURPRISE. THEIR BEST GUESS IS A BAD SENSOR BUT WHICH ONE, THEY DON'T KNOW WITHOUT THE USUAL PROCESS OF TRIAL AND ERROR. SPEAKING OF SENSORS AND ALSO SWITCHES, NEED TO FIGURE OUT WHICH ABS UNIT IS FAILING - 3 WEEKS OF INTERMITTENT LIGHT IS NOW SOLID. PROBABLY ON ONE OF THE DRIVES BECAUSE WHEN IT FIRST STARTED IT WOULD GO OUT ONCE TRAILER WEIGHT BALANCE WAS ADJUSTED. AND LAST BUT CERTAINLY NOT LEAST, CRUISE CONTROL WENT FROM BE ABLE TO SET ALL OF THE TIME, TO MOST OF THE TIME, TO SOME OF THE TIME, TO CURRENTLY - EVERY BLUE MOON! WAS TOLD IT'S PROBABLY THE CLUTCH SWITCH. SPRAYED CLEANER AND LIGHTLY LUBED BUT THAT WORK FOR ABOUT AN HOUR. ANY INFORMATION - HELPFUL COMMENTS, HOW-TO FIX, OPINIONS/GUESSES OR $$ CONTRIBUTIONS (ONLY KIDDING UNLESS YOU FEEL SO INCLINED) WOULD BE GREATLY APPRECIATED. BTW, TRUCKING IS RUNNING GOOD AND STRONG, BOUGHT AND STARTED RUNNING IT ABOUT 3 MONTHS AGO. HAVE PUT ON ABOUT 30K MILES SO FAR AND THESE ARE MY ONLY PROBLEMS. THANKS.

 

Thanks a lot, I'll do that!.

 

I'm checking some of the other posts and they are stating "low oil pressure". I'm getting the problem when oil pressure drops but still within the normal range, you still think the o rings might be the problem?

 

Sorry, was stressed and anxious.

Also didn't intend to use all caps, cap lock left on, my bad.

 

Yeah, now that I'm paying closer attention and under a load, the PSI numbers that you're giving are right where it's at.

Any idea of what kind of problems I could have with the throttle body? Thanks for your response.