OEM Main Engine Control Module for 2017-2020 Buick, Cadillac, Chevrolet, & GMC
Condition: Excellent (A) — like new, minimal to no wear
Professionally inspected and tested.
Product Notes Read before buying
Why Buy Used OEM Parts?
We check and test every used part before we sell it. It may show some wear, but it works and is ready to install.
This is the same part your vehicle came with from the factory. It fits and works just like the original — because it is one.
A few marks on the outside don't change what's inside. The part works the way it should.
Pay 50–80% less than buying new. Same factory part, much lower price.
Voice or type your vehicle details and Wrenchy will confirm fitment in seconds.
Vehicle Fitment Guide
This part fits the following vehicles:
| SubmodelSUB- MODEL |
Body Style | Years | Engine | Attributes |
|---|---|---|---|---|
| Convenience | SUV | 2017 | V6 3.6L | FWD | Automatic |
| Leather | SUV | 2017 | V6 3.6L | AWD/FWD | Automatic |
| Premium | SUV | 2017 | V6 3.6L | AWD/FWD | Automatic |
| SubmodelSUB- MODEL |
Body Style | Years | Engine | Attributes |
|---|---|---|---|---|
| Base | Sedan | 2017 - 2019 | V6 3.6L | FWD | Automatic |
| Livery | Hearse | 2017 - 2019 | V6 3.6L | FWD | Automatic |
| Livery | Limousine | 2017 - 2019 | V6 3.6L | FWD | Automatic |
| Luxury | Sedan | 2017 - 2019 | V6 3.6L | AWD/FWD | Automatic |
| Platinum | Sedan | 2017 - 2019 | V6 3.6L | AWD/FWD | Automatic |
| Premium | Sedan | 2017 | V6 3.6L | AWD/FWD | Automatic |
| Premium Luxury | Sedan | 2017 - 2019 | V6 3.6L | AWD/FWD | Automatic |
| Vsport Platinum | Sedan | 2017 - 2019 | V6 3.6L Turbo | AWD | Automatic |
| Vsport Premium Luxury | Sedan | 2017 | V6 3.6L Turbo | AWD | Automatic |
| Livery | Sedan | 2018 - 2019 | V6 3.6L | FWD | Automatic |
| SubmodelSUB- MODEL |
Body Style | Years | Engine | Attributes |
|---|---|---|---|---|
| PPV | Sedan | 2017 | V6 3.6L FLEX | RWD | Automatic |
| SubmodelSUB- MODEL |
Body Style | Years | Engine | Attributes |
|---|---|---|---|---|
| LT | SUV | 2017 | V6 3.6L FLEX | AWD/FWD | Automatic |
| LT | SUV | 2017 | V6 3.6L | AWD/FWD | Automatic |
| Premier | SUV | 2017 | V6 3.6L FLEX | AWD/FWD | Automatic |
| Premier | SUV | 2017 | V6 3.6L | AWD/FWD | Automatic |
| SubmodelSUB- MODEL |
Body Style | Years | Engine | Attributes |
|---|---|---|---|---|
| LS | Sedan | 2017 - 2019 | V6 3.6L FLEX | FWD | Automatic |
| LS | Sedan | 2017 | V6 3.6L BI-FUEL | FWD | Automatic |
| LS | Sedan | 2017 - 2019 | V6 3.6L | FWD | Automatic |
| LT | Sedan | 2017 - 2020 | V6 3.6L FLEX | FWD | Automatic |
| LT | Sedan | 2017 | V6 3.6L BI-FUEL | FWD | Automatic |
| LT | Sedan | 2017 - 2020 | V6 3.6L | FWD | Automatic |
| Premier | Sedan | 2017 - 2020 | V6 3.6L FLEX | FWD | Automatic |
| Premier | Sedan | 2017 - 2020 | V6 3.6L | FWD | Automatic |
| 2018 |
| SubmodelSUB- MODEL |
Body Style | Years | Engine | Attributes |
|---|---|---|---|---|
| LS | SUV | 2017 | V6 3.6L | AWD/FWD | Automatic |
| LT | SUV | 2017 | V6 3.6L | AWD/FWD | Automatic |
| Premier | SUV | 2017 | V6 3.6L | AWD/FWD | Automatic |
| SubmodelSUB- MODEL |
Body Style | Years | Engine | Attributes |
|---|---|---|---|---|
| Denali | SUV | 2017 | V6 3.6L | AWD/FWD/4WD | Automatic |
| SLE | SUV | 2017 | V6 3.6L | FWD/4WD | Automatic |
| SLT | SUV | 2017 | V6 3.6L | FWD/4WD | Automatic |
| SubmodelSUB- MODEL |
Body Style | Years | Engine | Attributes |
|---|---|---|---|---|
| Denali | SUV | 2017 | V6 3.6L FLEX | AWD/FWD | Automatic |
| Denali | SUV | 2017 | V6 3.6L | AWD/FWD | Automatic |
| SLE | SUV | 2017 | V6 3.6L | AWD/FWD | Automatic |
| SLE | SUV | 2017 | V6 3.6L FLEX | AWD/FWD | Automatic |
| SLT | SUV | 2017 | V6 3.6L FLEX | AWD/FWD | Automatic |
| SLT | SUV | 2017 | V6 3.6L | AWD/FWD | Automatic |
Policies, in plain English.
Shipping & Handling
- Standard shipping: 3-7 business days via UPS Ground
- Parts are carefully packaged to prevent damage during transit
6-Month Warranty
All used parts include a 6-month warranty from the date of purchase.
- If your part fails within 6 months, we will send a replacement
- Refunds are only issued if we cannot provide a suitable replacement
- Warranty covers defects — not installation errors, misuse, or damage after installation
Note: Warranty is for replacement, not refund. A part failing on day 80? We'll replace it. But the return window for refunds is 30 days.
Returns (30 Days)
We accept returns within 30 days of delivery for this part.
- Defective parts: We will replace the part or issue a refund at our discretion
- Electronic parts: Must be returned with the sealed inspection bag unopened. The clear bag allows full visual inspection before opening. Once opened, electronic parts can only be exchanged for a replacement if defective — no refunds
- Programming: "Needs to be programmed to my vehicle" is not a valid return reason. Many modules require dealer programming — we're happy to help connect you with resources if your dealer says it's not programmable
- Return shipping: We cover return shipping as part of our 100% money-back guarantee
- Parts must be returned in original packaging and unmodified condition
- Poorly packaged returns that arrive damaged will not be credited
Damaged in Shipping?
If your part arrives damaged:
- Stop immediately — do not install the part
- Keep all original packaging and boxes
- Take clear photos of the damage and packaging
- Contact us within 48 hours of delivery
We will handle the carrier claim. You are not responsible for shipping damage — we just need your help documenting it.
Order Cancellation
Orders can be cancelled before shipment for a full refund. Once shipped, cancellations follow our return policy.
Expert Guides
2018-2019 GM ECM Failure: Programming, Symptoms, and Replacement for Silverado, Escalade, Corvette & More
This guide covers the common failure symptoms and mandatory programming requirements for the engine control module (ECM) in many 2018-2019 GM trucks, SUVs, and cars.
Read Full Guide →Related Trouble Codes (OBD-II)
25 matching guidesIf your scan tool is showing one of these trouble codes, this part is a common fix. Each guide explains the code, how to diagnose it, and exactly what to replace.
Miscellaneous Information
OEM Part Numbers:
Other: 12667002, 12667189, 12670801, 12685918
Fits Years: 2017 2018 2019 2020
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Trusted Since 2007
Nearly two decades of shipping parts to professionals & enthusiasts.
Backed For The Long Haul
This part ships with a 6-month warranty. If it doesn't fit or stops working, we replace or refund — no hassle.
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