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Discussion Starter · #1 ·
So I got a check engine light. And I definitely lost power on the truck. And when I checked it I got a P2037 Turbo Boost Sensor A low circuit. I changed out the turbo boost sensor. Check and cleaned the wiring connections. Cleared the fault. And it ran great. But about two weeks later it came back. Same code. Anything else I might be missing?
 

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Are you sure it isn't P0237?
I get that one when my battery voltage gets low, like after starting and the grid heater starts pulling the system voltage down. You might try cleaning the battery connections and leave them disconnected overnight. In the morning, check each battery's voltage and any less than 12.6 volts gets traded in for a new one.
 

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Discussion Starter · #3 ·
I recently just replaced both batteries, and I replaced all the battery connections too, just to clean it up a bit. So I went in and checked all the connections. And looked for loose wires. I did a little inter web searching too and found this.
It talks about possible having a faulty turbo? Any experience with this?
 

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From the 2001 factory service manual,
P0237 Map Sensor Voltage Too Low. MAP sensor voltage input below the minimum acceptable
voltage.

This is the output signal voltage from the MAP sensor to the computer.
You might reset it and see if it comes back.
 

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Discussion Starter · #6 ·
UPDATE. So I’ve gone over the whole wiring system. And I’ve taken it to my mechanic twice and both times they can’t pinpoint exactly it. HOWEVER they think it might be the tuner. It’s and Edge Comp Mon. I’ve unplugged it and i haven’t gotten the code once.
Does anyone have or have had an issue with a faulty tuner? Mines a bit old, but it hasn’t given me any trouble before.
 

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Discussion Starter · #7 ·
From the 2001 factory service manual,
P0237 Map Sensor Voltage Too Low. MAP sensor voltage input below the minimum acceptable
voltage.

This is the output signal voltage from the MAP sensor to the computer.
You might reset it and see if it comes back.
I’ve reset it about a half a dozen times. It comes on at all different times. Just after I start it, cruzing down the highway at 75, or in town at 35. It happens after it’s been running for a couple hours. Or if it’s just been started.
 

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So has it started giving the code again lately or all summer?
 

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My Comp is grounded on the engine....one of the 4 intake bolts.
 
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