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ACM - Aftertreatment Control Module reflash

For better control of exhaust work, some manufacturers use separate Aftertreatment Control Module (ACM). It plays main role to control AdBlue tank sensors, heaters, urea pumps, SCR injectors, DPF sensors, exhaust flaps and brakes.
So when any of that components will be broken - ACM starts showing a fault and force ECU to use a limp mode. That"s why this unit required to reflash and fix broken parts (DPF, SCR and sometime EGR sensors) or in some cases possible to disable whole unit in ECU (with lost all functions - including DEF level and exhaust brake).

So if required to make a full kit of disabling DPF SCR EGR - we can take off ACM and disable all of that work.

When required to reflash ACM

About half of our catalog offer 2nd unit reflash just for +25% of price. It required in several cases.
  When not possible to stop injection from ECU with DPF system - than reflash required to unplug SCR pump and keep other logic in stock for DPF work.
  Need to keep other ACM functions - SCR DEF level at dash or work of exhaust brake flaps.
  Not possible to make ACM off because of monitoring from other units - than dash show will show a faults without ACM (Bosch EDC7, TRW EMS2.3-2.4, some Transtron ECU, latest version of MB MCM2.1, etc.).
  ACM faults can"t be erased to allow unit unplugging at clear state.

ACM types that supported to reflash: Bosch DCU15-17-VD1, Adem A5, Motorola Cummins ACM CM2220-2350-1881, Denso ACM (Kubota, New Holland), Continental ACM (for Mercedes MCM2x / Volvo / Scania EEC3).

When not possible to reflash ACM

Some type of ACM not supported by tools, no way read or write it.
• Hyundai H1 2015+ / some versions of H350 can use supported DCU17
• Fiat Ducato 2016+ MJ9D
• Opel and Chevrolet 1.6-2.0-2.8TDI with Delco E98
• Caterpillar or DAF - possible to reflash, but hard to get out from machine, so easier just to unplug a fuse
• Mercedes - ACM3 not readable yet, CPC reflash required to fix DTC for ACM loss

So if there DPF, than ACM off and 0 injection possible only with full kit disabling with DPF off.
Just SCR off in single ECU - not a full solution, keep some urea injection from ACM with all possible counters / messages.
If other units not restrict that, ACM can be unplugged on clear dash, when all faults from this unit erased or repaired. If not possible to clear - try to take off battery for 15-20min or use resistor on broken sensors.