Automotive Robo Tech was called in to a shop with a 2004 Chevy G2500 and a 6.0 liter engine, setting multiple codes such as P0300, P0358 or alternator circuit faults. The vehicle did not exhibit any other issues, but had also previously been found with a low battery charge issue as well. Upon receiving the car, the shop decided to replace the alternator, even though a load test passed with flying colors. The intermittent nature of the problem made the shop simply replace the alternator. After the repair, the problem persisted and it was then that the shop decided to call me in for assistance. My first rule if business, was to perform a battery and alternator charge test using my Midtronics battery tester, and a loaded test as well. I even checked the charge wire for a voltage drop. It all passed with flying colors. It all indicated that the issue was very intermittent. Next, being that this alternator is controlled by the ECM, I decided to scan the vehicle for codes. I did find codes P0300 and P0358, just like the shop said. It was clear to me that code P0300 or general misfire code was the result of the ECM going into low voltage mode, and causing a misfire due to it. Low voltage will make the injectors open much less, causing a lean misfire. Code P0358 pointed directly to the alternator or its circuit. I knew then that what was needed was for the wiring harness to .... See what happened next!.... Get the whole story right now!..... Learn and have fun.... Presented using ...
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