2001-2002 LB7 to 2004.5-05 LLY conversion harness

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Convert your 01-02 LB7 to an 04.5-05 LLY!




If you have a 2001-2002 LB7 Duramax, you are well aware of the constant injector problems that plague this otherwise reliable generation of Duramax engines. Swapping out your LB7 for a 2004.5-2005 LLY Duramax has become an increasingly popular alternative to costly injector replacement. Especially since the LB7 short block does not have to be changed; it is possible to swap an LLY "top end" (IE, cylinder heads, injectors, fuel system) onto your existing 2001-2004 LB7 short block, further reducing the cost of the swap/upgrade.
BT DieselWorks has developed an industry-first custom plug-and-play wiring harness to allow you to easily install a 2004.5-2005 LLY engine/ECM into your 2001-2002 LB7 truck. Also included with the custom harness is pre-wiring for an EFILive DSP-5 switch! No need to fiddle around with ECM pins and run wires; all of that is already added to the custom harness.
There are absolutely no compromises with this custom upgrade/retrofit harness. Your factory 2001-2002 style instrument cluster, tow/haul mode, and air conditioning all remains fully functional. All of the gauges work properly, no nuisance check engine lights, etc. You do NOT have to rip apart your interior or dash wiring harnesses. You do NOT have to swap AC compressors or discharge the AC system. You do NOT have to swap fuse boxes, etc. The custom harness easily plugs into the factory 2001-2002 underhood fuse box and underhood bulkhead connectors. The installation is as simple as unplugging and removing the factory LB7 underhood ECM/TCM harness, unbolting the LB7 ECM mounting bracket, and then plugging the BT DieselWorks custom harness and bolting up the LLY ECM bracket.
Included with the custom wiring harness is custom LBZ ECM programming to allow the 2004.5-2005 LLY ECM to properly communicate with the 2001-2002 body electrical system. The custom ECM programming will NOT be "locked", so you are completely free to retune the custom ECM base tune as you wish with EFILive.
*NOTE: This is a custom harness modification/ECM programming service. The price listed does NOT include a harness or ECM. You are required to provide us with a stock, unmodified 2004.5-2005 LLY engine wiring harness which we will fully clean and disassemble, perform the proper modifications and reconfiguration for 2001-2002 operation, and reassemble the harness. All ratty electrical tape and poor-condition wire loom will be replaced so the harness is ready for installation and looks like new. We only use made-in-USA factory/OEM Delphi connectors, automotive-grade TXL wire, and professional grade 3M Super-33 electrical tape. You must also send us the factory 2004-2005 LLY ECM so we can reflash both modules with the custom base tune for proper 2001-2002 body compatibility.
 Please contact us first before ordering at btdieselworks@gmail.com for details.

Please click the "Installation Guides" link on the top menu bar to download installation instructions in PDF format.

All BT DieselWorks-manufactured products are fully-warrantied for 1 year. Products from other manufacturers may or may not have specific warranties. See individual product descriptions for details. -------- All sales are final. Returns will be given as full price in store credit, or money refund plus 40% restocking fee.

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