My gmc envoy idles rough and the ses light pop on with a p015

sometimes is hard to get there and cost a lot of money.

Yes it could cause that. the EGR is near the rear of the engine, if it is leaking it will sizzle water when you touch it with wet fingers.

When you disconnected the battery, the PCM (power control module) was reset to factory default. You can try driving it with several engine on/engine off cycles. Get it up to 50 mph each time so the computer can recognize the transmission operation also. Hope this helps.

Rough Running When Cold GMC Yukon

Have you had it scanned to find out what the code is for the SES light. It will give you a clue in to the problem. Autozone will read your codes for free.

sound slike you may have unplugged or disconnected somethine else or the spark plug you put in is bad or inpropper gap

Service Engine Soon (SES) or Check Engine Light On, DTC P0480, P0526/P1481/P1484 Set (Replace Engine Cooling Fan Wiring Harness) #05-06-02-012B - (10/19/2006)

Models:2004-2006 Buick Rainier
2002-2006 Chevrolet TrailBlazer, TrailBlazer EXT
2002-2006 GMC Envoy, Envoy XL, 

Some customers may comment that the Service Engine Soon (SES) or Check Engine light is illuminated. This condition may be intermittent and upon investigation, the technician may find either DTC P0480, P0526, P1481 or P1484 set.

This condition may be caused by the cooling fan harness chaffing against the plastic guide it routes through. This contact may damage the insulation of the wires enclosed in that harness.

Replace the wire harness: 
Part Number 89024920 Description Harness Assembly, Engine Cooling Fan Wiring

Good luck and keep me posed. 

thats what i call rough idling. now! check your idling switch control valve.service it by cleaning it.

try this website fix & troubleshoot heating & A/C www.automedia.com and another car A/C repair www.directgardening.com

There is a chance that your ABS module is going out, or has gone out, although that doesn't explain the rough idle problem. I had the same thing happen on my '01 Tahoe, and it's a known problem with ABS units. Repair at dealer is over $1200.00. Repair yourself with a rebuilt module is $150.00+shipping and a little elbow grease. Get on EBay, search for ABS module repair, and there is a company in Russia, Iowa who will rebuild the one you have, and warrant it for 5 years (GM won't do that with their $1200 repair.).

The rough idle I bet is coincidental and not related.