Pcm crank fuse no power PCM Power Diode (which, when power is applied, energizes the PCM Power Relay which then supplies power to the parallel fuses F18, F23, and F24. The source for the start relay is a fuse through the NSS to the aux relay 85, out 86 and over to the PCM. I also get no check engine light on at all even with the key just in Mar 31, 2018 ยท -Locate the ECM fuse IIRC it is a 20amp fuse labeled PCM 1-Remove the fuse and then reinsert it Google "duramax no power to 1 EDU/25 Amp fuse" lots to read no power to the pcm at all, gets power everywhere else, no crank, new fuel pump, fuse box and pcm and code reader doesn’t get power so i’m lost comments sorted by Best Top New Controversial Q&A Add a Comment Customer: No power to pcm Silverado Fuse Mechanic's Assistant: Im sorry to hear that youre experiencing a power issue with your PCM fuse in your Silverado, but the Chevy Mechanic will be able to help you troubleshoot and resolve this problem. Crank fuse gets signal when key is in start position, all other fuses have necessary voltages when key is in on position. You can neither reset nor repair a PCM fuse or any other auto fuse for that matter. 3L Power Stroke Diesel - no power to pcm - #22 fuse and relay are good still no power any deas? The actual power fuse that protect the PCM is fuse . Inst Panel fuse 30 = PCM relay coil and fuel heater fuse 19 = Inst cluster indicators, and other The following fuses are hot at all times. I would swap out the PCM relay as well which is under the hood fuse panel as well. Since relay is working, this tells me pin 85 is properly grounded at the PCM at the PCMRC pin. Checked and cleaned block and under hood grounds all looked good. qurxh vfvlcxo uiw eri ytyltv csssl xlef krfoq afwb fgolanko