Fitment notes: Side post terminals standard on GM full-size vans; battery located under hood on driver side
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Every control module on the 1981-1989 Chevrolet Van — 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.
Instrument Cluster (IPC)2.0 hr R&Rno coding
📍 dashboard behind instrument panel face
⚠️ Analog gauges with electromechanical speedometer; no electronic programming. Odometer is mechanical.
Electronic Brake Control Module / ABS Control Module (EBCM)1.5 hr R&Rrelearn only +0.3 hrwith optional ABS (1989 only, G30 chassis)▸ programming details
📍 left frame rail behind driver seat area, near fuel tank
🔧 test drive bleeding procedure
⚠️ Bosch 2U system; requires conventional brake bleeding plus ABS pump cycling procedure after replacement.
Electronic Control Module (ECM)1.2 hr R&Rdealer / factory tool +0.5 hrfuel-injected engines only (TBI 1987+, TPI 1985-1986)▸ programming details
📍 behind right side engine cover panel in passenger compartment, above doghouse
🔧 PROM chip replacement or Tech 1 (1989)
⚠️ Early ECMs (1981-1986) require physical PROM chip replacement for calibration changes; 1987+ use removable MEM-CAL. Carbureted engines have no ECM.
HVAC Control Head (HVAC)1.0 hr R&Rno coding
📍 center dashboard below radio
⚠️ Cable-operated mechanical controls; no electronic module. Vacuum-actuated mode doors on some models.
Transmission Control Module (TCM)1.0 hr R&Rrelearn only +0.3 hr▸ programming details
📍 Right side of engine compartment or under vehicle near transmission
🔧 Tech 1
⚠️ Only on 1987-1989 models with 4L60 (700R4) electronic transmission. Adaptive shift relearn required.
Radio / Entertainment System (Radio)0.8 hr R&Rno codingwith factory radio option
📍 center of dashboard in instrument panel
⚠️ AM/FM analog radio; no electronic control or programming required.
⚠️ Non-programmable solid-state ignition trigger device (HEI system); not a microprocessor-based control module. Simple replacement part requiring no programming or calibration.
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 1983 Chevrolet Van 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.