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Discussion Starter · #1 ·
I am having recurring issues with my Map sensor getting P0237. The truck is a 07 5.9 CAI, HT Turbo (wastegate fooling resistor in place of electric wastegate), AFE Intercooler getting no boost truck is in limp mode. Had the issue first time last week got a code scanner cleared all codes and the P0237 would not clear. Ordered a new Map sensor from my local Cummins replaced it truck ran perfect for a week, this morning truck is back in limp mode and P0237 is back not sure what is causing this sensor to fault. I have done a lot of searches on this topic but a lot of people don't come back and share their solution to the issue. If anyone has a suggestion on what can cause a MAP sensor to go bad multiple times please help me out.

I checked all connections and everything looks clean no damaged wires I can see going crazy trying to figure this one out.
 

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First off you don't know the sensor is bad merely that it sets a code. This can be caused by other issues.

Carefully follow the wiring harness all the way back to the ECU checking for any areas that may show chaffing/wear on the wiring. If that looks good inspect the pins in the connectors for corrosion, sprung pins, etc. Might try shooting some contact cleaner in both sides. As a last check pull the connector from the ECU and check all connector pins as stated.
 

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Discussion Starter · #3 ·
The reason I say the sensor is bad is because when I changed the sensor the truck started running fine again
 

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Have you completed all the tests in the Service manual?

9 - 1168 ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
P0237-MAP SENSOR VOLTAGE TOO LOW

several pages.
Until then, you have not proven the sensor has failed
and instead of being a diesel service tech, you are just a parts thrower that I would not pay to service my lawn mower
 

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Discussion Starter · #5 ·
Thanks for the encouraging words steelhead.

To report back for all those who might need help on this and to respond your question.
I performed the diagnostic procedure, voltage checked out and resistance was fine on MAP harness. I proceeded to clean out ECM 50 pin harness connector, the MAP harness, IAT sensor, IAT harness with electrical contact cleaner. None of which looked to have the slighest corrosion. The truck came out of limp mode and has been running fine since.
 
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