ACDelco E66 — Full Delete for 3.0L Duramax LM2 / LZ0
DPF Off · EGR Off · SCR / AdBlue (DEF) Off · Stage 1–3 — professional ECU file service for 2021+ SUVs · 2022.5+ pickups USA / Canada vehicles.
Full emissions delete and tuning for the current 3.0L Duramax — the ACDelco E66 controller. It covers the 3.0 SUVs from 2021, the 2022.5 "Refresh" Silverado and Sierra 1500, and the 2023-onwards LZ0 engine. DPF, EGR and SCR/AdBlue off with checksum correction, delivered in 1–3 hours. For the wider picture — every Duramax controller, what the deletes actually switch off and what the dyno shows — see our GM Duramax emissions guide.
What's included in the delete package
- DPF / FAP delete
- EGR / AGR removal
- SCR / AdBlue / DEF / UREA delete
- Related DTC deactivation
- Checksum correction
- Throttle valve (TVA) disable — on request
- Speed limiter / Vmax modify — on request
Everything else this controller supports — swirl flaps, throttle valve, lambda, rev limit, gearbox and Stage 1 to Stage 3 — is listed below and can be added to the same order.
Reading and writing with HP Tuners
Most of our customers on these controllers work with HP Tuners — MPVI2+, MPVI3 or MPVI4 with VCM Suite. We work with .hpt files natively: send the file exactly as VCM Editor saved it and you get a .hpt back, ready to write. No conversion, no hex editor, nothing to install on your side.
HP Tuners is the only tool that flashes the E66 in its Global B form, and it needs the one-time send-in ECM service first: the module goes to HP Tuners, comes back upgraded, and licensing then costs 8 Universal Credits per ECM. After that VCM Suite reads and writes it normally. VCM Editor ships without map descriptions for these operating systems, which is why most shops send the file out instead of calibrating it themselves — or order our DAMOS map pack and do it in-house.
- Unlock / service the ECM once, so HP Tuners can read and write it (see the note for this controller below).
- Read the ECM with VCM Suite and save the .hpt file.
- Upload the .hpt to our file service and pick the services you need.
- We return a modified .hpt within 1–3 hours — same format, ready for VCM Editor.
- Write it back with VCM Suite and clear the codes.
EFILive, Alientech and bench tooling are supported too — send whatever your tool produced (.hpt, .ctz, .bin) and say which tool you use. We return the file in the same format.
Which vehicles have this controller
- Chevrolet Tahoe / Suburban 3.0 Duramax (2021+)
- GMC Yukon 3.0 Duramax (2021+)
- Cadillac Escalade 3.0 Duramax (2021+)
- Chevrolet Silverado 1500 / GMC Sierra 1500 3.0 Duramax (2022.5 Refresh and 2023+ LZ0)
| Make | Model | Engine | ECU | Full delete |
|---|---|---|---|---|
| Cadillac | Escalade (2008-2020) | 3.0d Duramax LM2/LZ0 | ACDelco E66 | from 440 € |
| Chevrolet | Silverado (1999-2026) | 3.0d Duramax LM2/LZ0 | ACDelco E66 | from 450 € |
| Chevrolet | Suburban (1992-2026) | 3.0d Duramax LM2/LZ0 | ACDelco E66 | from 440 € |
| Chevrolet | Tahoe (1992-2026) | 3.0d Duramax LM2/LZ0 | ACDelco E66 | from 440 € |
| GMC | Yukon (2008-2020) | 3.0d Duramax LM2/LZ0 | ACDelco E66 | from 440 € |
Supported OS numbers — 11 calibrations
Read the operating system number from your original file or with your tuning tool, then open its page for the exact specification and price.
Don't see your OS number? Send us the original file — we develop and add a solution for any operating system within 3 hours, and the new OS goes on this page the same day. Send file → Ask on WhatsApp
Instant price for your truck
Pick your vehicle and the services you need. The price you see is the price the order form charges — every bundle discount is already applied. No registration required.
All 16 services for ACDelco E66
Prices are per file and drop sharply when several are ordered together — the calculator above shows the real total for your combination.
Emissions
| Service | What it does | Price |
|---|---|---|
| DPF / FAP delete | Diesel particulate filter switched off completely — regeneration strategy, soot and ash models, differential-pressure and temperature monitoring, and the derate that follows a blocked filter. Related codes are deactivated so nothing returns to the dash. | 160 € |
| EGR / AGR removal | Exhaust gas recirculation shut down — valve control, cooler bypass, position feedback and the flow plausibility checks. Intake stays clean and intake temperatures drop, which is the usual reason fleets order it alongside the DPF. | 120 € |
| SCR / AdBlue (DEF) off | Selective catalytic reduction and the whole DEF system deactivated: dosing, quality and level checks, NOx sensors, the countdown warnings and the speed limitation that follows them. Reset all AdBlue values on the original file with everything still connected before writing the modified file. | 340 € |
| Lambda / O2 removal | Wideband lambda sensor in the exhaust deactivated together with its plausibility and ageing checks — normally ordered when the sensor has failed or has been removed with the aftertreatment. | 75 € |
| Smoke test passing | Calibration adjusted so the truck passes an opacity / smoke test — useful where the vehicle still has to go through a periodic inspection. | 90 € |
| Selective DTC off | Individual diagnostic trouble codes switched off by number. Use it when one specific code has to go and everything else must keep working — send us the code list. | 60 € |
Performance & tuning
| Service | What it does | Price |
|---|---|---|
| Stage 1 | Calibration on the stock hardware: torque structure, injection timing and quantity, rail pressure and boost control reworked together. Safe for the transmission and drivetrain, developed on the dyno, and it keeps the factory protection strategies intact. | 160 € |
| Stage 2 | For a truck with hardware changes — intake, exhaust, intercooler, larger injectors or a modified turbo. The torque limiters and smoke maps are opened up further than Stage 1 allows, and the file is built around the parts actually fitted. Tell us the build. | 320 € |
| Stage 3 — custom, hybrid turbo | Full custom calibration for a heavily modified engine: hybrid or upgraded turbochargers, high-flow fuel system, uprated injectors, built transmission. Air mass, boost targets, injection angle, rail pressure and every torque limiter are rebuilt around your specific combination rather than scaled from the stock file. Send the full build sheet and, if you have it, a datalog — this one is developed per vehicle, not per model. | 450 € |
| Speed limiter / Vmax | Vehicle speed limiter raised, removed or set to a value you specify — the usual request after a tyre or gearing change. | 70 € |
Sensors, flaps and monitoring
| Service | What it does | Price |
|---|---|---|
| Swirl valve / intake flaps off | Intake swirl flaps and their actuator deactivated together with the position feedback and the plausibility checks. Standard job on a high-mileage engine where the flap linkage has seized or the runners have been cleaned out — no codes, no limp mode, no dash light. | 95 € |
| Throttle valve (TVA) disable | Intake throttle actuator switched off. On these engines the throttle is used for EGR flow control and shutdown damping, so it is normally deactivated together with the EGR. | 85 € |
Transmission
| Service | What it does | Price |
|---|---|---|
| 10-speed TCM tuning | Calibration for the GM 10-speed automatics — the 10L80 behind the 3.0L and the Allison 10L1000 behind the 6.6L, controlled by the T93 TCM on the 2020–2023 L5P. Shift points, shift firmness, per-gear torque limits and converter lock-up. Order it with a Stage file so the gearbox can actually hold the extra torque. | 260 € |
| T43 TCM tuning (6-speed) | The GM T43 transmission control module — the unit fitted to the 6L45 / 6L50 / 6L80 / 6L90 six-speed automatics, so it is what sits behind the 2.8L Duramax and behind the earlier six-speed trucks. Shift points, line pressure and torque converter lock-up are recalibrated together with the engine file; on its own it fixes lazy or harsh shifting without touching engine output. | 290 € |
File services
| Service | What it does | Price |
|---|---|---|
| Checksum correction | Checksums recalculated on a file you modified yourself. Included free with every tuning or delete order — this line is for when you only need the checksum fixed. | 20 € |
| Back to original | Your file rebuilt back to factory content — for warranty work, resale, or recovering from a bad tune. Send the modified file you have. | 30 € |
DAMOS & map pack — for any OS version
For every operating system on this page we can supply a DAMOS map pack with full descriptions of the maps — typically 60 000 to 90 000 unique described maps per file, covering torque structure, injection, rail pressure, boost control, air mass, EGR, aftertreatment, limiters and diagnostics. This is what you need if you calibrate the file yourself rather than ordering a finished tune.
- OLS — standard WinOLS project — opens on any WinOLS installation.
- OLSX — WinOLS project locked to your WinOLS ID, so the pack stays yours.
- XDF — on request, built for your software — for tuners who work inside VCM Editor or another XDF-based editor instead of WinOLS.
What the pack looks like
damos full map pack
damos full map pack
Not on the list? A map pack can be produced for any OS of this controller, including calibrations that are not published yet. Contact us on WhatsApp →
Technical notes — ACDelco E66
The E66 is the controller that replaced the E46 on the 3.0L Duramax, and it covers both engine generations: the LM2 and, from 2023, the LZ0. Operating systems 12739182 and 12742975 belong to the LZ0. It runs Global B logic, and this is the single most common reason a delete "does not work": the aftertreatment must be completely restored and the dashboard cleared BEFORE the modified file is written, because the cluster cannot be cleaned afterwards. Once that is done, all emission-related sensors and components can be disabled. Eleven operating systems are covered — five more than were listed in our original Duramax article, because GM kept shipping new calibrations through 2025. Because the 3.0L runs a far smaller DPF than the 6.6L, the post-delete calibration mainly targets injection timing and boost control rather than fuelling volume, so what you feel is drivability and towing behaviour more than a peak-power number.
The full guide: all five ACDelco controllers side by side, supported tools, delivery times and what customers actually order.
How it works
- Unlock / service the ECM once, so HP Tuners can read and write it (see the note for this controller below).
- Read the ECM with VCM Suite and save the .hpt file.
- Upload the .hpt to our file service and pick the services you need.
- We return a modified .hpt within 1–3 hours — same format, ready for VCM Editor.
- Write it back with VCM Suite and clear the codes.
Package prices
| Package | Price |
|---|---|
| Full delete — DPF + EGR + SCR/AdBlue | 440 € |
| Full delete + DTC selectivity off | 455 € |
| Full delete + Stage 1 | 515 € |
| DPF + EGR only | 220 € |
| Stage 1 alone | 180 € |
Prices include every bundle discount and match the file service order form.
FAQ
- Which OS numbers are supported for ACDelco E66?
- We currently support 11 operating systems: 12716399, 12728650, 12728651, 12732783, 12737066, 12739182, 12739668, 12742974, 12742975, 12747610, 12748818. If your OS is not on the list, send the original file — we develop a solution for any operating system of this controller within 3 hours.
- My OS number is not listed. What now?
- Send the file anyway. A new calibration is not a problem: we build the solution for any OS of this controller within 3 hours, and the OS is added to this page the same day.
- Can I just send the .hpt file from HP Tuners?
- Yes — that is how most orders on this controller arrive. Send the .hpt exactly as VCM Editor saved it and you get a .hpt back, ready to write. No conversion on your side, no hex editor, nothing to install. EFILive .ctz and plain .bin files are equally fine; tell us which tool you use and the file comes back in the same format.
- Do I need to send my original file, or do you have a ready one?
- Send your own original file. Every truck carries its own calibration data and VIN-linked parameters, so we modify your file rather than shipping a generic one.
- How long does it take?
- 1 to 3 hours during service hours. Most orders come back inside the first hour, and even a brand-new operating system that we have never seen is covered within 3 hours.
- My truck has Global B — do I need to restore the emission system first?
- Yes, and this is the step people skip. On Global B the instrument cluster cannot be cleaned after a modified file has been written. Restore the aftertreatment completely, clear the dashboard, and only then write the delete file.
- Can I disconnect the sensors after the file is written?
- Yes. Once the cluster has been cleared and the delete file written, all emission-related sensors and components can be disabled.
- Which tools can read and write this controller?
- HP Tuners with VCM Suite, after the send-in E66 ECM service (Global B). Send the .hpt exactly as VCM Editor saved it; we return a .hpt.
- Will the dashboard warnings disappear after the delete?
- Yes, provided the emission system was restored and the dashboard cleared before the modified file was written. If you write first and try to clear afterwards, the messages stay — that is a property of Global B, not of the file.
- Do you supply DAMOS or map packs so I can tune it myself?
- Yes, for any operating system of this controller. A pack typically contains 60 000 to 90 000 unique described maps — torque structure, injection, rail pressure, boost, air mass, EGR, aftertreatment, limiters and diagnostics. It comes as an OLS project, or as OLSX locked to your WinOLS ID; on request we build an XDF for your own software instead.
- Can you do Stage 2 or a custom file for a hybrid turbo?
- Yes. Stage 2 covers a truck with bolt-on hardware; Stage 3 is a full custom calibration built around a hybrid or upgraded turbocharger, uprated injectors and a built transmission. Air mass, boost targets, injection angle, rail pressure and the torque limiters are rebuilt for your combination rather than scaled from the stock file. Send the build sheet and a datalog if you have one.
- How much does a full delete cost for my truck?
- A full delete — DPF, EGR and SCR/AdBlue together — starts at 440 € for ACDelco E66 on the 3.0L Duramax LM2 / LZ0. Use the calculator on this page to price your exact vehicle and service combination; no registration is needed to see the price.
Related
- Original file for this ECU
- Other ACDelco controllers: E41 · E42 · E46 · E98
- Read more: Emission Deletes & ECU Tuning for GM Duramax Trucks