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0U100 no power to fuses #41 #42#45 on a 07 hhr . No crank

Old Mar 4, 2026 | 07:05 PM
  #1  
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0U100 no power to fuses #41 #42#45 on a 07 hhr . No crank

Bought this for the engine , my 09 engine was bad. But it turned out that the car only had 141,000 miles on it and it was really clean so I decided to keep it now it won't crank I've read these forms for 2 days and done every single thing that was suggested and still have no power going to #41 #42 and #45 fuses and ran the scan and came back no communication with ECU /TCM .
Tested fuses they all came back neg on one side.
Old Mar 4, 2026 | 08:26 PM
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Does everything include gorilla tightening the 4 bolts in the under hood fuse box, checking that there is 2 large wires connected to the front lug and 1 wire on the rear lug of the fuse box and checking all of the fuses on the BCM (inside fuse box)?
What year is the car?
Old Mar 4, 2026 | 09:07 PM
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It's 07 , donor car 09. Gorrila tite, all fuses have power except 41 45 . 2 days of grounds fuse box ECT...the fuses are ground not positive . Everything else is fine. Checking PNS next. One other question I have a good donor car with bad motor. Worked perfect . Can swap everything to make the 07 work. Keys ecu ECT ... Without flashing .

Old Mar 4, 2026 | 09:46 PM
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We think it's the PNP it's possible it's in wrong position .
Old Mar 5, 2026 | 07:17 AM
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That’s plausible
Old Mar 5, 2026 | 08:51 AM
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Originally Posted by Mlamey01
It's 07 , donor car 09. Gorrila tite, all fuses have power except 41 45 . 2 days of grounds fuse box ECT...the fuses are ground not positive . Everything else is fine. Checking PNS next. One other question I have a good donor car with bad motor. Worked perfect . Can swap everything to make the 07 work. Keys ecu ECT ... Without flashing .
Could you please translate to old man speak? I am assuming 2.4L?
If 41 & 45 have no power 33 should also be dead. They all get energized from relay 26.


Last edited by donbrew; Mar 7, 2026 at 01:26 PM.
Old Mar 5, 2026 | 02:54 PM
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26 is hot on 2 legs forced relay to close now 41 and 45 are hot and fuel relay forced on .still no crank
Old Mar 5, 2026 | 07:55 PM
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There is a link to FREE shop masnuals in my sig, the wiring diagrams are in it.
Old Mar 7, 2026 | 12:11 PM
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Think the new ecu from flashmasters for 109.00 may do it. Hope the TCU and BCU are good . I had every fuse but 41 45 42 no communication with ECU or TCU . Seems you can do this on a home computer with a tool? Is there any that didn't cost 1000's or a cheat? Thank you for all the info 2 days of reading I know a enough to get it done. Tried the 09 same part number and everything came on for a sec.

Old Mar 7, 2026 | 12:40 PM
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Originally Posted by donbrew
There is a link to FREE shop masnuals in my sig, the wiring diagrams are in it.
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