YukonTyler Posted August 28, 2017 Share Posted August 28, 2017 Odd concern - cranks and fires properly with the (factory) remote starter. Click but no real crank (tries to turn over, sounds like weak batteies) when starting the the key in the igntion. I fixed it with two new batteries. My question is why would the truck fire all of the time with the remote starter but not with the actual key. Increased electrical demand with the key in the ignition? That doesn't seem likely when most loads are shed during cranking. Quote Link to comment Share on other sites More sharing options...
tonybullitt Posted August 28, 2017 Share Posted August 28, 2017 I have had this also. It has to be because when remote started not all modules are powered up. Quote Link to comment Share on other sites More sharing options...
mchan68 Posted August 28, 2017 Share Posted August 28, 2017 I had this exact same concern on 2012 6.7L truck awhile back back as well. Like yours, replacing both batteries repaired mine. On mine, the passenger side battery failed a load by a mile but the driver side battery just barely passed if I recall correctly. Quote Link to comment Share on other sites More sharing options...
jw33 Posted August 28, 2017 Share Posted August 28, 2017 Have had that as well Quote Link to comment Share on other sites More sharing options...
YukonTyler Posted August 28, 2017 Author Share Posted August 28, 2017 Looks like I'm late to the party - never had seen this concern before! Thanks for the feedback. Quote Link to comment Share on other sites More sharing options...
Matt Saunoras Posted August 28, 2017 Share Posted August 28, 2017 I had one too on an 11. It was under bumper to bumper so it got one battery and all was good Quote Link to comment Share on other sites More sharing options...
cbriggs Posted August 29, 2017 Share Posted August 29, 2017 I have seen a few incomplete starts (too short of crank time to fire) all caused be batteries in these as well. One was on a 2017. Quote Link to comment Share on other sites More sharing options...
tonybullitt Posted January 2, 2018 Share Posted January 2, 2018 we got a 17 in with starter kicking out after second of trying to start has new batteries and if we use a remote starter it cranks just fine. looked at pids and don't see any reason for pcm to quit the cranking Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted January 5, 2018 Share Posted January 5, 2018 I have a customer as well with this exact concern. We have yet to verify it so we can’t diagnose it really. But this is interesting. I know the guy wants to bring it in again so I’ll have to look at the batts closer for giggles. It does not make sense but if with the remote start there is less load on the batts that could explain it. Quote Link to comment Share on other sites More sharing options...
tonybullitt Posted January 6, 2018 Share Posted January 6, 2018 The truck we have this going on is a 17 with under 3k miles and had 6 batteries in it. Concern been ongoing since new. Its good for a little while after batteries put in then back to the concern. Its my coworkers job but I am helping him a lot on it. We have found if charge batteries it starts properly leave the key on to run self tests monitor pids then acts up put jump box on then starts fine. Tried replacing the starter no difference. When the batteries are slightly discharged and concern is acting up we have even put the slightly discharged batteries in like truck and they start that truck fine. We pulled pins out of the bjb put in a different relay and concern is present. (start relay is built in the bjb) The wires from pcm to bjb have been load tested and overlayed and concern still occurs. He has replaced the pcm no difference. The command from pcm to bjb start relay is being interrupted for some reason. Quote Link to comment Share on other sites More sharing options...
tonybullitt Posted January 6, 2018 Share Posted January 6, 2018 We have tried many other things that I am not recalling at this time. Truck is a pickup that has had the box removed for a service body install. The concern was happening while awaiting the install. So concern was happening before upfit. Quote Link to comment Share on other sites More sharing options...
tonybullitt Posted January 17, 2018 Share Posted January 17, 2018 Ended up finding pin fit issue in BJB causing voltage drop and pcm to stop providing power to starter relay 1 Quote Link to comment Share on other sites More sharing options...
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