Fitment notes: Heavy duty truck application; some models may accept Group 27 as alternative
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Every control module on the 1981-1986 Chevrolet K30 — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
⚠️ Rear-wheel ABS (RWAL) standard on some models; four-wheel ABS optional. Early Bosch 2 system.
Electronic Control Module (ECM)1.2 hr R&Rdealer / factory tool +0.5 hrgasoline engines with electronic fuel injection▸ programming details
📍 passenger side firewall, below master cylinder
🔧 PROM chip replacement
⚠️ Physical PROM chip must be transferred from old ECM or replaced with correct calibration. Early ALDL 160-baud (1981-1985), 8192-baud from 1986. Not present on carbureted engines.
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 1981 Chevrolet K30 350ci V8 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Mechanic · 20+ years.