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U0140 — Lost communication with body control module
Universal diagnostic code. Below: what it means, common causes, symptoms, and the exact bench-programming fix path.
Common causes
- •BCM internal failure
- •BCM power lost
- •CAN-bus break
Symptoms you'll see
- •Multiple body systems dead
- •Anti-theft active
- •No remote functions
The fix path
For GM Passlock-related cascade: GM Instrument Cluster Upgrade + Mileage Program ($200). For other brands: bench BCM evaluation — text us.
AML services that fix this
Mail in the affected module, we bench-program, ship back next business day. Flat pricing, return shipping included.
GM Cluster Upgrade + Mileage Program
$200GM Silverado / Tahoe / Yukon / Sierra cluster upgrade or swap — mileage programmed to match your VIN.
Service detailsKeyless Entry Module Repair
$125Remote not working? Keyless entry module dead? Ship it in — we repair or reprogram and ship back ready to pair.
Service detailsRelated diagnostic codes
B0028Airbag deployed — SRS module crash data storedB1004SRS Module Internal Failure / Crash Data StoredC0040ABS Module Internal FailureCluster mileage mismatchReplacement cluster shows wrong mileagePasslock faultGM Passlock anti-theft triggered after cluster swapRKE not respondingRemote keyless entry not working — module deadNot sure which service applies?
Text us your year/make/model + which scanner caught the code — we'll tell you exactly which module to ship and which service to pick.