Battery change causes default mode??

[leolkfrm]

03 gmc 2500HD4x4 LB7 bought used 1 yr ago
Had a no start today, 5 degrees out and windchill of -15. truck was plugged in for about an hour, but batteries did not have enough juice.
here is the problem
Put 2 new matching batteries in, started out to return the cores and could not get more than 2000rpm and check engine came on. Dropped the cores off and on the way home power returned ran like always, but still have a light.
can't get it scanned till mon, to see what is stored.
has anyone heard of a problem when disconnecting both batteries at the same time with it going into default and setting a light?

[Duramaster]

I have replaced a few batteries on the DMAX, but never had your problem. Just for grins, disconnect both batteries for 1/2 hour, reconnect and try again. This is not a fix, but may clear the dtc's since you do not have a scanner available to you.

[leolkfrm]

Just had it out again, light cleared itself. I'll have it scanned Mon and see if it set a code. definitely scratching the head on this one

[leolkfrm]

Finally got a chance to post codes too many

P0087A fuel rail pressure low (twice)
P0404 EGR open pintle
P0650 MIL control circuit
P0700 TCM MIL request
U1041 ??
P1093C Fuel rail pressure out of range
U1152 ??

This is the order they were in, would the fuel rail fault be the reason for the default? Don't know why it happened with the battery change

planning on doing a service to it and changing the fuel filter.

any ideas?

[Mark Rinker]

Purely timing and coincidence...

Change fuel filter, reset codes, repeat every ~15K miles.

[leolkfrm]

Thankyou, I've had just a year and never checked for codes,some may have been there when I bought it! I've put only @5000mi on it, it was supposedly gm certified when i bought it