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How is the JK's factory wiring and computer handled during a MoTech Gen V LS swap — is the Jeep ECM removed?
- Gen V E92 ECMs are identified by a sticker on the backside of the module with 'E92' at the top center. Chevrolet Performance LT1/LT4 controller kits ship with a pre-programmed E-92 controller plus fuel pump power module and fuel pressure sensor for direct injection, calibrated for older-vehicle retrofits with unneeded production-vehicle features turned off. (applies to E92; LT1, LT4, L83; 2014+)
- Chevrolet Performance LT4 controller kits (e.g., 19419241/19418595) bundle the pre-programmed E-92 controller, harness, sensors, throttle pedal, fuel pump power module, and fuel pressure sensor; there are variants for analog vs digital fuel pressure sensors and a 3-pin variant (19419242) for 8L90E transmissions. (applies to E92; LT4; 8L90E)
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Confirm against the instructions for your exact parts before wiring. More: Computer and tune in our tuning guide.
No, the Jeep side stays, and neither computer gets hacked. We recommend running the entire GM powertrain on the stock GM harness, the stock E92 ECM and the stock OE calibration. Leave the Chrysler modules (ABS, TIPM, WCM) alone. A MoCAN bridge module connects the two networks using only CAN in/out, power, ground, and safety circuits such as neutral safety. That keeps cruise control, A/C and the dash working. Earlier Gen IV versions of this setup used E38/E40/E78/E67 ECMs.
Check this first:
- Whether the engine is Gen V (E92) or Gen IV so you use the matching ECM
- That the neutral safety circuit works before the first start
Careful: Confirm the neutral safety circuit works before the first start, so the engine can't crank in gear.
Based on what we've seen work across our own builds, our friends' builds and the wider LS community, reviewed by our lead shop tuner (over 20 years of LS and LT tuning experience). Every combination is different, so use at your own risk and check our safe tuning limits before any wide-open pass.
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Every option we know of
| Maker / product | Part # | Fits | Price | Where | Status / notes |
|---|---|---|---|---|---|
| Lingenfelter TRG-002 58x-to-24x conversion module | TRG-002 | 58x Gen IV into 24x vehicle | about $300-380 | Buy WS6store, Westers Garage | Current production One-way conversion only |
| GM / junkyard Cable-throttle intake + throttle body | varies | Cathedral-port heads | about $50-150 used | wrecking yards | Yard dependent Avoids DBW pedal/TAC/wiring |
Prices are approximate as of September 2026. We list every option we know of, including small shops and used parts we can't link to. Confirm fitment with the seller.