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Lost 3 days to a no-start on a 6.7 Cummins, turned out to be a $14 sensor
Had a 2019 Ram 2500 towed in last Tuesday with a crank no-start and I figured it was a fuel issue like always. Pulled the codes, got a P0087 low rail pressure, so I threw a lift pump at it, then a pressure relief valve, then bled the whole system twice. Three days of chasing my tail and about $900 in parts the customer did not need, all because I trusted the code over the data. Finally hooked up a scope and watched the cam and crank signals, and the cam sensor was dropping out for a split second every few revolutions. Swapped in a $14 cam sensor and it fired on the first bump. I should have scoped it on day one instead of reading codes like a rookie, and honestly the parts cannon approach cost me more than the repair paid. Any of you guys got a rule for when to stop trusting codes and grab the scope?
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hall.quinn17d ago
Three days and $900 in parts for a sensor that costs less than lunch is wild. The code was just telling you what the symptom was, not what caused it, and that is the trap with chasing P0087 down the fuel path. My rule is simple, if the data looks weird and the code does not match what the engine is doing, the scope comes out before I touch a single part.
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