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  • Standard order lead time for STANDALONE WIRING HARNESSES is estimated to be 11-13 weeks from date of purchase.

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L84/10L80E Standalone Harness *Global A* with O2's

L84/10L80E Standalone Harness *Global A* with O2's

$
Choose your options:
Sending in ECM for reprogramming?(required):
Sending in TCM for reprogramming?(required):
Year/Model of Donor Vehicle(required):
Add MAF Sensor?:
Gear Ratio/Tire(required):
Select Pedal Type(required):
Add NSS?:
Neutral Safety Switch for 10 speed automatics to prevent the vehicle from starting in gear.
Front End Drive(required):
Examples are Holley, Wegner, CVF Racing, Drive Junky, etc.
Product Code: Harn-L84-10L-A
Our NEWEST standalone wiring harness! This kit includes:
- Standalone Wiring Harness
- *NEW* Front Oxygen Sensors (pair)
2019-2021.5 *GLOBAL A Vehicles only* equipped with the L84 engine (5.3L) and 10L80 transmission
Transmissions and engines must be global A variants with non ETRS transmissions.
Return style fuel setup only (340 LPH fuel pump required with adjustable regulator set to 72 PSI constant)
-Returnless fuel setup not available on the E90 ECM's.
Please give us a call for additional details!
All online orders are for our default harness length. Our default harness length is approximately 42" from the passenger side rear head and mounts the modules under-the-dash. If you need a custom layout to mount the computer elsewhere, call to order.

All harnesses are built and tested on a live engine/transmission prior to shipping to verify the integrity of our wiring.
*We don't support the factory L84 or L87 oxygen sensors. The connectors are unavailable and this harness kit includes compatible O2 sensors!
Harness Includes:
- Standalone Wiring Harness - 42" long from passenger side rear head for the ECM/TCM to mount inside in a dry location
- Firewall Grommet
- Compatible Front O2's (Pair)
- Simple 3-wire hook-up to get your engine/transmission operating in your swap vehicle.
- Fuse Block
- Accelerator Pedal Connection
- OBD-2 port with integrated check engine light
- Fuel Pump Relay (Return style fuel setup only on E90 ECM's)
The wiring harness is 42" long from the passenger side rear head. This allows the ECM and TCM to mount inside the vehicle, traditionally near the firewall. Custom layouts are available for phone orders only!

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