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A "powertrain control module" that has gone bad.
Lost Communication with Transfer Case Control Module
Possible reason there is no spark on a 1987 to 1990 Chevrolet Celebrity V6: This assumes that the spark plugs and wires are in good order and the ignition key is on. No power to the ignition module. Faulty ignition module. Faulty crankshaft position sensor. Faulty wiring or connectors. Faulty engine control module (engine computer) There may well be others, these are common causes I have seen.
Many things could happen but to start with, the check engine light will probably illuminate.
two partof module and software component
Either the coil is bad or the ignition control module is bad.I would think the coil is faulty.
The problem is most likely a faulty blower control module.
Low freon charge and faulty CCRM (Constant Control Relay Module).
Possibly one of these"A faulty ignition control moduleLoose or shorted connection at the module
P1651 is the same as Volvo code 981A, engine control module internal fault / faulty signal.
Your computer or Module is faulty.
The dealer "flashes" the computer to correct software issues.