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2004 CHEVY 2500 HD DURAMAX DIESEL WHAT CAUSES THE P0641 CODE TO APPEAR. WHY DOES THE ENGINE GO INTO REDUCED POWER MODE?

Vehicle: 2004 CHEVY 2500 HD DURAMAX DIESEL

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Hi there,

This code indicates an issue with the ECM. Here is some info for you.

P0641 CHEVROLET - 5 Volt Reference Voltage Incorrect

Read more: https://www.autocodes.com/p0641_chevrolet.html

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