This GDI sub harness connects the GM Gen V GDI controller to early LTx-engine fuel injectors. Early engines are identified by a 4-pin fuel pressure sensor mounted to the back of the driver-side fuel rail; GM used two different sensor styles across the Gen V LTx engine family, so confirm which one your engine has before ordering.
Specifications:
- Engine/Platform: Early GM Gen V LTx
- Harness Application: LT
- Harness Type: Injector
- Identifying Feature: 4-pin fuel pressure sensor
- Sub Category: Wire, Cable and Related Components
- Warning: California Proposition 65
- Part Number: 558-220
Compliance: This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).
FAQ
How do I know if I need the early or late sub harness?
Check the fuel pressure sensor on the back of the driver-side fuel rail: a 4-pin connector is early (558-220), a 3-pin connector is late (558-221).
What is this harness used for?
Connecting the GM Gen V GDI controller to the factory injectors on early LTx engines.
Is this harness legal for street use?
No. It is legal for sale and use only on Racing Use Only vehicles — competition vehicles not registered or operated on the street.
