Edge Pulsar issues

[Fireman48]

Ive had this installed for 8 months or so. I really only bought it for the tire size adjustment but who doesnt like more power. A couple times when I first got it, my dashblit up, check engine light and throttle pedal goes crazy. I checked the ground and tightened it really good and it does great but I very rarely take it off stock.
Well, the other day I did. For the 2 weeks prior, my mileage normally 15.5avg went to 12.5avg. No changes, no check engine nothing but It seems like the MDS wasnt engaging as often hence worse mileage.So I thought I'd try the economy setting. That lasted 5 minutes, went back to stock and bam, xmas lights on my dash. Turned it off and restarted. Everything was fine but the check engine stayed on as expected. I checked the codes and there were 2. To engine one A/T. One was U1400 which ive never had before. I cleared it and so far, mileage is back to normal.
1 Is there anything else I can do so I can change the pulsar on the fly as designed and it not flip out.
2. Does the U1400 normally cause a check engine light to come on?
If my mileage tanks again or I don't notice the MDS kicking in as usual I will check for codes.

 

[CG2742]

I don’t know much about pulsar. I have a Diablo tuner and Greene tune. I get better gas mileage without mds always have. Even at stock. If mds is the big issue I doubt very much it would drop your mileage that much. My other trucks did better without mds. I doesn’t save you if anything on gas. Also I have heard pulsar is totally hit and miss. Take it off and see how it does stock.

 

[HEMIMANN]

OP - your post says you have an MDS engine, but your avatar says you have an old Cummins 5.9 diesel engine in a 2007 MY truck. What do you actually have?

NP here with my Edge Pulsar - 6.4 Hemi. btw, it's made by Diablo Sport also.

 

[Fireman48]

OP - your post says you have an MDS engine, but your avatar says you have an old Cummins 5.9 diesel engine in a 2007 MY truck. What do you actually have?

NP here with my Edge Pulsar - 6.4 Hemi. btw, it's made by Diablo Sport also.

I traded the Cummins for the blue 2019. I guess I still had the Cummins when I joined the forum. My bad.
I guess I could take it out and put it back in see if I'm missing something.

 

[Fireman48]

Sending it back to Pulsar for replacement
tomorrow. Quick turn around.