Won't start, possible electrical issue
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New User
Joined: Dec 2014
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Won't start, possible electrical issue
I kind of got the same problem going on, went to start nothing. Towed it into town started. Went to start it couple days later nothing. Jump the plug by right battery starter turns. When key is turned to run no glow plug light, no fuel pump prime. Tested ignition switch good. Tried 2 new Batteries nothing. got power on fuse 52, continuity from fuse 52 to pcm connector. Fuse 49 and 50 also have power. Scan tool will not communicate with pcm.
Codes after cleared:
instrument cluster
uo100 lost communication to pcm
u300a-64 ignition switch...
transmission:
u0294 lost communication with pcm
Body control module:
u0100-87 lost communication with pcm
B10f1-14 key in switch short to ground or open
Codes after cleared:
instrument cluster
uo100 lost communication to pcm
u300a-64 ignition switch...
transmission:
u0294 lost communication with pcm
Body control module:
u0100-87 lost communication with pcm
B10f1-14 key in switch short to ground or open
Post Fiend
Joined: Nov 2001
Posts: 6,748
Likes: 119
From: Tallassee, ALabama
U codes as you can see are communication errors. I would check all electrical connectors on major components such as the BCM, PCM, TCCM, etc to see if any are not making good connection. I would even consider unplugging them and spray with WD-40 and reconnect.
All three point to the PCM as maybe where the connector might be giving the problem. Check under the hood for the 3 connectors on the passenger side near the air conditioner to see if they might be the problem. That is the PCM in that location.
All three point to the PCM as maybe where the connector might be giving the problem. Check under the hood for the 3 connectors on the passenger side near the air conditioner to see if they might be the problem. That is the PCM in that location.
Hotshot
Joined: Oct 2006
Posts: 10,187
Likes: 8,069
From: Texas
I kind of got the same problem going on, went to start nothing. Towed it into town started. Went to start it couple days later nothing. Jump the plug by right battery starter turns. When key is turned to run no glow plug light, no fuel pump prime. Tested ignition switch good. Tried 2 new Batteries nothing. got power on fuse 52, continuity from fuse 52 to pcm connector. Fuse 49 and 50 also have power. Scan tool will not communicate with pcm.
Codes after cleared:
instrument cluster
uo100 lost communication to pcm
u300a-64 ignition switch...
transmission:
u0294 lost communication with pcm
Body control module:
u0100-87 lost communication with pcm
B10f1-14 key in switch short to ground or open
Codes after cleared:
instrument cluster
uo100 lost communication to pcm
u300a-64 ignition switch...
transmission:
u0294 lost communication with pcm
Body control module:
u0100-87 lost communication with pcm
B10f1-14 key in switch short to ground or open
I am thinking that this has been primarily gas powered trucks, but might be a possibility in the diesels, also.
Good luck to you!
Thread Starter
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New User
Joined: Dec 2014
Posts: 9
Likes: 0
U codes as you can see are communication errors. I would check all electrical connectors on major components such as the BCM, PCM, TCCM, etc to see if any are not making good connection. I would even consider unplugging them and spray with WD-40 and reconnect.
All three point to the PCM as maybe where the connector might be giving the problem. Check under the hood for the 3 connectors on the passenger side near the air conditioner to see if they might be the problem. That is the PCM in that location.
All three point to the PCM as maybe where the connector might be giving the problem. Check under the hood for the 3 connectors on the passenger side near the air conditioner to see if they might be the problem. That is the PCM in that location.
thanx but I tried that even the connector on transmission and nothing
Super Moderator
Joined: Aug 2003
Posts: 25,479
Likes: 742
From: Isanti, MN
Hey Gaut,
Don't have any words of wisdom about your issue, but I moved it into its own separate thread. Your issue is completely different than the sensor issue that happened in the thread you posted in.
Don't have any words of wisdom about your issue, but I moved it into its own separate thread. Your issue is completely different than the sensor issue that happened in the thread you posted in.
Thread Starter
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New User
Joined: Dec 2014
Posts: 9
Likes: 0
Yeah, I've tried reseating all the connectors on pcm nothing happened. Ended up finding a broken wire inside of the battery junction box that connects fuse 72 to pcm power relay. repaired the break and started up no problem. Thanx guys
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