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The Powertrain Control Module (P.C.M.), formerly called ECU or E.C.M. for Electronic Control Unit/Module, is the on board computer or brain of modern automobiles that uses electronics to monitor all the functions of the car. For the Bonneville, the P.C.M. can be located inside the air cleaner assembly on the left side of the engine compartment. Make sure ignition is turned?æoff when checking this parts.

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10y ago

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