ACDelco E41 — Full Delete for 6.6L Duramax L5P / L5D
DPF Off · EGR Off · SCR / AdBlue (DEF) Off · Stage 1–3 — professional ECU file service for 2017–2023 USA / Canada vehicles.
Full emissions delete and custom tuning for GM heavy-duty trucks running the ACDelco E41 controller on the 6.6L Duramax, model years 2017 to 2023. DPF, EGR and SCR/AdBlue are switched off together with the limp-home and power-limiting strategies that the factory calibration triggers when the aftertreatment reports a fault. 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.
The E41 is the easiest of the big Duramax controllers to get into. HP Tuners unlock for this ECM is done in the vehicle in about 20 minutes — nothing has to be removed or shipped — using an MPVI2+ with the Pro Feature Set, or an MPVI3. Bench unlock services exist as well if you prefer to send the module. After the unlock, VCM Suite reads and writes the E41 directly, and the .hpt file it produces is exactly what we need from you.
- 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 Silverado 2500HD / 3500HD (2017–2023)
- GMC Sierra 2500HD / 3500HD (2017–2023)
- Chevrolet Silverado 4500HD / 5500HD / 6500HD medium duty
- Commercial and chassis-cab applications
| Make | Model | Engine | ECU | Full delete |
|---|---|---|---|---|
| Chevrolet | Silverado (1999-2026) | 6.6d L5P and L5D | ACDelco E41 | from 455 € |
| Chevrolet | Tahoe (1992-2026) | 6.6d L5P and L5D | ACDelco E41 | from 455 € |
| GMC | Sierra (2008-2020) | 6.6d L5P and L5D | ACDelco E41 | from 455 € |
| GMC | Topkick (2008-2020) | 6.6d L5P and L5D | ACDelco E41 | from 455 € |
Supported OS numbers — 25 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 17 services for ACDelco E41
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. | 210 € |
| 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. | 180 € |
| 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 € |
| Rev limit / idle rpm | Factory rev limit raised, idle speed changed, or a static rpm added for PTO and stationary work. On the 6.6L the factory 4000 rpm limit can be taken up to about 5500 rpm when the build supports it. | 180 € |
| Speed limiter / Vmax | Vehicle speed limiter raised, removed or set to a value you specify — the usual request after a tyre or gearing change. | 120 € |
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. | 40 € |
| 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. | 80 € |
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
full damos map pack
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 E41
The E41 is the controller used on the 6.6L Duramax from the L5P launch through the 2023 model year, after which the E42 takes over. Once the file is out of the ECU the delete is conventional: SCR, DPF and EGR are switched off together with the associated limp-home and power-limiting strategies, then the checksum is corrected. Dashboard messages clear normally here — this is the one ACDelco controller in the range where the order of operations is not critical, which is why it is the most forgiving of the five to work with. Twenty-five operating systems are covered, spanning the whole L5P/L5D range from the first 12690xxx calibrations to 12731638. Beyond the deletes we raise the factory 4000 rpm limit — up to about 5500 rpm on a supporting build — remove the speed limiter, and offer Stage 1 through Stage 3, including full custom calibration for hybrid turbo setups.
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 | 455 € |
| Full delete + DTC selectivity off | 470 € |
| Full delete + Stage 1 | 520 € |
| DPF + EGR only | 270 € |
| Stage 1 alone | 180 € |
Prices include every bundle discount and match the file service order form.
FAQ
- Which OS numbers are supported for ACDelco E41?
- We currently support 25 operating systems: 12690762, 12690763, 12692043, 12697840, 12697841, 12698093, 12698595, 12699524, 12704854, 12708075, 12708517, 12709842, 12709843, 12709844, 12710937, 12714514, 12718488, 12720289, 12723939, 12725870, 12728644, 12729375, 12730511, 12730512, 12731638. 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.
- Which tools can read and write this controller?
- HP Tuners is the main route: unlock in-vehicle (~20 min, MPVI2+ Pro or MPVI3), then read and write with VCM Suite. EFILive added full E41 support in v8.4.53 and works with CTZ files — send those as they are if that is your tool. Where neither is available, shops start from a GM TIS direct-import calibration; the microcontroller itself is locked by GM security settings, so there is no casual bench read.
- Will the dashboard warnings disappear after the delete?
- Yes. On the E41 the cluster clears normally once the modified file is written and the codes are cleared — no special ordering of the steps is required.
- 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 455 € for ACDelco E41 on the 6.6L Duramax L5P / L5D. 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: E42 · E46 · E66 · E98
- Read more: Emission Deletes & ECU Tuning for GM Duramax Trucks