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It tried to start but blew the pcm fuse what is that what should I do next

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  • Cars & Trucks Master
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The PCM is the engine computer an it needs battery voltage for it to work ! You have a short an if you don't know about such thing's I suggest you take it to a automotive electric shop !

Posted on Apr 14, 2015


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SOURCE: Car blew PCM fuse and would not run, replaced the

generally when a pcm fuse blows you have another issue that caused the fuse to blow. You may of damaged the replacement PCM by not fixing this problem first. You will need a diagnaostic scanner and manufacturer troubletree procedures to proceed.

Posted on Jan 22, 2010

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I have a 2004 GMC envoy v6 and the instrument panel, radio, electric seats, a/c are not working. We tried to jump someone else and when we we accidentally touched the jumper cables to a metal part, it...

-Check each fuse by looking through its plastic if it blow you can tell or hook up volt meter to (in Ohm) you'll find which one is burn.


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There is a dead short to ground on that circuit . There are videos on youtube showing how to find an fix a short . Do you know how to do automotive electrical testing ? How to find automotive electrical shorts Look at the wiring harness under the hood for rubbed through wire's , harness going to the PCM , also find out what if any thing else is powered by that fuse . Which PCM fuse ? There are a few PCM 1 , PCM B , etc...

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Any one of these fuse will cause the engine not to crank . The PCM energizes the starter relay which supply's power to the starter .

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Car blew PCM fuse and would not run, replaced the PCM with a rebuilt pre-programmed unit. Now the car starts but runs very rough and smells very rich and has no power

did you use your old prom chip? when you changed it out/ if not then it wont run right not all pcm's/ecms use the same prom chips per year model

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You need to check the PCM for fault codes, if none exist, you need to follow the manufacture's diagnostic tree for "No start - no codes". You will need a manual or a Mitchell On-Demand or AllData program for this. You probably blew up the PCM.

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hello first thing to check is your fuses make sure there all good sounds like one blew ign,ecm,pcm, goodluck

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disconnect pcm and try a fuses if it blow again its our pcm when there to many different code always clear it and drive it and scan it again hope its a fixya thanks pierre

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