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Having a dead pedal issue on my 2002 24v auto. codes are p0122 p0236 p1475. problem is very intermittent. New apps sensor after confirming all apps power grounds and signals were good. when i have a pedal map and apps reading are were they should be, when problem is occurring map voltage is maxed out and apps signal is all over the place. Initially thought short between apps wiring and map wiring, could not find such short and did not notice change during wiggle test of harness nor could i measure continuity between apps and map circuit. Starting to think bad ecm, the problem did start after bleeding my low pressure fuel system getting diesel all over driver side of engine. Fuel pressure is good. If anyone could help that would be great.

Hi Guys, I have been learning alot about my cummins from reading these forums. This is my first post, so please forgive me if this topic has been covered. Background: I finally got my quad adrenaline board replaced and I had no boost pressure. I replaced the map harness because there were a couple butt splices in the wiring and presumed that was the problem. Once I changed the harness I have a boost reading on my control pod of 48-51 pretty consistently no matter TP, speed, ect. I did some reading on here and found out some map sensors "Fail High", which seems to correspond to my issue and also gives good reason to my poor mileage 8-10 mpg. Occasionally when I start the truck up the boost starts at 0 and will go up to 20 or 21 depending on throttle, ect. But usually goes right back to 48-51 upon restart. I ordered a map sensor from Advanced Auto for $135 with a 25% online coupon and when I received it the connector was more oval shaped than the one on the truck, so I returned it. I called the dealer today and found out that they sell a Boost Sensor and a wiring harness for $370 something. The parts guy didn't know much so that is why I am here. Assumptions: 1. I am currently assuming the Map sensor is still bad even though it occationally works. 2. I am assuuming cummins has updated this sensor with a new connector style and requires the new harness to connect. Questions: 1. Is it normal for a map sensor to sometimes work and sometimes not being either/or on start condition? Or is this an electrical issue? 2. Are my assumptions correct about the new connector type and require a harness? 3. Recommendations for sensor and harness? Or old style sensor connector? Below is picture of Old sensor on the left and new sensor on the right. Thanks in advance!