Holley EFI Transmission Control Harness - 2009+ GM 4L60E
Type: Transmission Harness | Fits: GM
Expanding on our Transmission Control options from Holley EFI. This new harness 558-455 from Holley EFI provides plug and play transmission control for the 2009+ GM 4L60 when used with a Dominator ECU. The 2009+ GM 4L60E contains an internal turbine speed sensor, which was not on the previous model year transmissions. Additionally, the valve body range selector is wired and controlled differently from the ECU.
Features:
- Made for Dominator
- Connectors, relay, and unterminated wires
- Built in Relay (Must be wired to a switched 12V source)
- Plug and play with 2009+ GM 4L60E Transmissions
Specs:
- Brand: Holley EFI
- Category: Transmission
- Connector Quantity: 4
- Emission Code: 5
- Grade Type: Performance
- Harness Application: GM
- Harness Type: Transmission
- Make: GM
- Part Type: Automatic Transmission Wiring Harness
- Product Type: Transmission Harness
- Sub Category: Automatic Transmission Components
Tech Resources:
Requires software version 5.0 build 100 or higher and ECU firmware 5.0 build 110 or higher
Hurry Up! Only 25 items left in stock!
Copy link:
Share:
Ask a question
Shipping
We strive to provide fast and reliable shipping options for all our customers. For detailed information about our shipping rates, delivery times, and policies, please visit our Shipping Page.
Return Policies
Your satisfaction is important to us. If you wish to return an item or request a refund, please review the terms and conditions outlined in our Returns Policy.
Important Notices
- Off‑Road Use Only
Products sold by JS Speed are intended for off‑road use and may be illegal on public roads where emissions or pollution‑control laws apply. - Check Local Laws
Before purchasing or installing, verify all applicable local, state/provincial, and federal regulations to ensure the modification is legal in your area. - Professional Installation Recommended
These parts should be installed by qualified professional mechanics. Improper installation can cause performance issues or vehicle damage. Unless a product page explicitly states otherwise, installation instructions are not included. Components are designed for users with solid mechanical knowledge, and minor adjustments or modifications may be required for proper fitment. Returns or refunds cannot be accepted due to difficulty completing an installation or the absence of instructions. - Warranty Impact
Use of these parts may void your vehicle’s factory warranty. Confirm with your vehicle manufacturer before purchase and installation. - Limitation of Liability
JS Speed is not responsible for damage, failures, or issues arising from the use or installation of these products. - Product Images
Images are for illustration only and may differ from the actual product due to manufacturer updates or improvements. - No Performance Guarantees
While these products are designed to enhance performance, JS Speed does not guarantee specific performance results.
