Intermittent cut off for a split second

I had a 98 volvo with an N14 that did this exact thing. Two different times. Ended up being a different thing each time, but symptoms were identical. Just like you turned the key off and back on, horrible shock to the driveline. What caused mine was, the first time corroded ends on the ecm fuse which was in the battery box on that truck. Next time it was a sticking injector (due to ULSD). Fix that time was atf added to the fuel. Did you check for all ground wires, not just battery and starter? You might have to turn into sherlock holmes for a day to find it. I'm betting it's either a bad ground, or a bad fuse/connector/ etc. someplace. That could cause strange codes to appear too.

 

Those codes are for the X-Y shifter motor faults and a communication problem with the trans ECU. If they showed up after you replaced the trans harness, then the harness is defective, the wrong one, installed wrong or one (or more) pins were bent during installation.

 

Mine is doing the same thing. Did the ECM replacement fixed the problem? Thank you

 

This is driving me nuts, Same truck same trans same problem
Any ideas will be appreciated

 

Just tried a different ECU, same problem again

 

Still having the exact same problem
HELP
Replacing the trans ECU did not help