Diesel Chip or Program Setting DTC P0700

Why do guys running a diesel chip or programmer seem to run into diagnostic trouble code P0700? Some get it while hard driving and others under normal driving?

A P0700 is a DTC stored in the Engine Control Module that serves as a flag to indicate that the Transmission Control Module has set a DTC and is reporting that it has detected a failure that will effect emissions. Generally only a fairly aggressive chip or programmer horsepower setting will cause this DTC to set and cause the transmission to default to fourth gear. The typical DTC to set in the Transmission Control Module is P0735 (Incorrect Fifth Gear Ratio). This will, in turn, cause a P0700 to set in the Engine Control Module.

What happens?

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Joel Paynton is an award-winning GM technician who specializes in Duramax fuel systems. He also does custom programming for any GM powertrain. Visit him on the web at www.payntonperformance.com.


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