P0657 FIAT Actuator Supply Voltage A Circuit Open

P0657 FIAT Actuator Supply Voltage A Circuit Open

Possible causes
– Faulty Engine Control Module (ECM)
– ECM harness is open or shorted
– ECM circuit poor electrical connection
– ECM Programming
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P0657 FIAT Description

The Transmission Control Moduel (TCM) has detected a voltage supply fault to the hydraulic control unit

Citroen Vehicle:Fiat 500,Fiat Bravo,Fiat Croma,Fiat Grande Punto,Fiat Idea,Fiat Weekend,Fiat Panda
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