Which diagnostic trouble codes should be turned off in an LS swap tune?
What a swap calibration typically handles (GM Truck Central, Warr Performance, Chevy Hardcore):
- VATS/anti-theft disabled: the recipient vehicle doesn't have the matching theft hardware.
- Diagnostics matched to the hardware: rear O2 and catalyst, EGR, canister purge, fuel-tank pressure, and alternator codes the swap harness doesn't wire.
- Correct VIN, electric-fan temperatures set, and the speed limiter raised on retailer-programmed units.
- Engine and driveline data: injector flow, VE, spark, axle ratio, and whether EGR, EVAP and secondary air are present.
Rule of thumb: disable only the codes for hardware your swap doesn't have. Speedway notes emissions parts can be left out of operation, but the PCM may need programming so it doesn't set codes for them. If you delete the MAF, its codes need reconfiguring too (LSX Magazine). See the swap tune checklist.
Confidence: medium — sources disagree or are limited; check the sources below.
Related questions
- Why would VATS and starter checks refuse to disable on an E38 ECM even after a Write Entire?
- What is the exact procedure to disable DoD/AFM in the tune without a mechanical delete kit?
- How do I set up 6L80E part-throttle and WOT shift tables after a gear and tire change in an engine swap?
- How do I add a real flex fuel sensor to an E38 Camaro and dial in E85 — what needs adjusting beyond enabling multifuel?
- What is needed to segment-swap a 4L60e E38/T42 truck to a 4L80E?
- Does simply selecting 4L80E under the transmission tab convert a 4L60E tune, or is a segment swap required?
Sources
- WH1201 Gen III LS Standalone Wiring Harness installation manual — Speedway Motors
- 12200411 PCM swap — GM Truck Central (archived)
- Making Your LS Power Change A Controlled Swap — Chevy Hardcore
- GM 0411 PCM 5.3 with 4L80E segment swap VATS deleted LS swap ready — Warr Performance
- LS Tuning For Optimum Performance — LSX Magazine