Fuse 28(under hood) PCM 1 - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Old 08-13-2019, 01:25 PM
dma47940 dma47940 is offline
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Fuse 28(under hood) PCM 1

I have a 2003 TB EXT and I can't figure out why I it occasionally blows fuse 28 PCM 1. It has been about 1.5 months since the last time we had this issue but it is kinda difficult to trust it in this situation. I have tried unplugging the fuel pump relay, fuel injectors, coil packs, O2 sensors and range/selector mechanism. The last time it blew the fuse I noticed the shift interlock solenoid was no longer functioning. A few days ago I went out to try working on it again and the keys were stuck in the ignition. I decided to replace the ignition switch and that didn't do anything either. Anyone have an idea of what could be happening? Is the shift interlock system tied into the PCM 1 circuit somewhere? Thank you in advance.
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Old 08-13-2019, 04:59 PM
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EnvoyBoy2004 EnvoyBoy2004 is offline
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That power source only goes to the ignition coils, injectors and the PCM. Since it happens only occasionally, it is going to be hard to troubleshoot. It could be any coil or injector, or a wiring issue such as am abraded wire somewhere in a harness.
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Old 08-13-2019, 05:37 PM
dma47940 dma47940 is offline
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Fuse 28

What is the proper ohm reading from terminal to terminal for the coil packs? I r also had a aftermarket remote starter installed that works sometimes and doesn't other times. I am going to remove it and see if that helps too. Thank you again for the help.
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