Pardon this slightly long but complete answer.Oach! Sounds like a misdiagnose and cannon ball repair...
What diagnostics are listed on the original WO?
What authorized service shop do you have in Ontario?? They all left town 4 yrs ago in BC...
Issue statement: "ESP and Service 4WD lights on, 4X4 and cruise inop" This is all correct.
Service description statement: "G scan test, Code C1093, needs ESP module"
After the first replacement module failed I asked specifically if (a) there could be a sensor or mechanical brake problem that causes the C1093 error, and (b) could they at least cause the transfer case to drive back into AWD drive, instead of 4W lock mode. The answer was, in so many words, "no". I've worked through other issues with these folks over a few years and they have been quite competent and, I think, honest.
Issues in the last year have been with a seized transfer case motor and an oxygen sensor failure. Both identified and resolved quite rapidly, and with complete success.
The closest Suzuki authorized service centre to me is in Barrie, ON (still 2.5 hours away) at the G.D. Coates Used Car Superstore. More Suzuki autos there, both for service and sale, than I've seen anywhere for a lot of years.
I worked with G.E. Medical Systems, then rebranded to G.E. Healthcare, for 23 years on everything from simple x-ray systems to research MRI units. I've been in very similar situations myself, both as a field service rep and as a service manager. I know the particular corner of Hades that these folks now reside in. No fun at all.
My suspicions, apart from a true ESP module failure?
1. There may be a hardware or firmware incompatibility that has not been identified between ESP module versions and my vehicles' unit.
2. Somewhere there may be a key instruction missing in their troubleshooting/repair process.
3. There may still be some fault that masquerades as a ESP failure.
I've seen every one of those situations happen in my previous line of work. Damn, I'm glad to be retired!