CAT ET Version History — Why the Version Matters
Caterpillar releases ET updates annually. Each version expands the list of supported ECMs, updates flash file libraries, and fixes bugs that can cause failed programming sessions or inaccurate fault descriptions on newer equipment. Running an outdated CAT ET on a 2022+ Cat excavator or motor grader can result in missing ECU communication — particularly on equipment with the latest ACERT or Cat Clean Emissions Module (CEM) electronics.
CAT ET 2019C — Current Version
| Category |
What Changed |
| New Equipment Coverage |
Cat 395 Large Excavator (new 2019 model); Cat 374 hydraulic excavator ECM; Cat D11T Dozer updated CEM support |
| Engine Updates |
Cat C18 ACERT — updated Tier 4 Final aftertreatment parameter set; C32 Marine — updated flash file library |
| Programmable Parameters |
New idle shutdown timer configuration for Cat 980 Wheel Loader; updated fuel economy mode parameters for Cat 336 Excavator |
| Aftertreatment |
Improved DPF forced regen control on C13 ACERT Tier 4 Final; updated CEM (Clean Emissions Module) ECM communication for 2018–2019 equipment |
| Bug Fixes |
Resolved CAT ET crash when connecting to 336 Excavator with active DPF fault; fixed event log export failure on Windows 10 1903+ |
| Windows Compatibility |
Full Windows 10 (1903 / 1909 / 2004) compatibility verified; Windows 11 compatible in ET 2019C with latest patch |
| CA3 Adapter |
Improved CA3 USB 3.0 stability during long ECM flash sessions on heavy equipment |
CAT ET 2018C — Previous Version
| Category |
What Changed |
| New Equipment Coverage |
Cat 349 Next Generation Excavator; Cat 745 Articulated Truck; initial Cat 395 pre-production support |
| Engine Updates |
Full C7.1 Tier 4 Final coverage; C9.3 ACERT updated parameter set |
| Bug Fixes |
Fixed false “ECM not communicating” error on Cat 980 Wheel Loader with CA2 adapter |
| Event Log |
Added event log filtering by component group (engine / transmission / hydraulics) |
CAT ET 2017A — Earlier Version
| Category |
What Changed |
| New Equipment Coverage |
Cat 320 Next Generation Excavator; Cat 140M3 Motor Grader |
| Windows Support |
First version with Windows 10 64-bit official support |
| Bug Fixes |
Resolved parameter corruption issue on C15 ACERT ECM programming sessions |
| Recall Support |
Added flash files for NHTSA Recall 07V279000 (C11/C13/C15 oil cap) follow-up verification procedures |
Older CAT ET Versions — Key Notes
- ET 2016A/B: Last version with Windows 7 support. Added initial Tier 4 Final coverage for Cat excavators.
- ET 2015A: Major update for ACERT Tier 4 Interim engines. First version with integrated CEM (Clean Emissions Module) diagnostics.
- ET 2013A: Added Cat C15 ACERT and C18 ACERT full parameter coverage. Last version supporting CA1 adapter on newer equipment.
Should You Upgrade to CAT ET 2019C?
If you work on Cat equipment produced after 2017 — especially the Next Generation Excavator line (320 NG, 330 NG, 336 NG, 349 NG) — yes, upgrade to 2019C. Earlier versions lack full ECM communication support for these platforms and may fail to read event logs or complete flash sessions on 2018–2019 Cat equipment.
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