A Volkswagen error code P0685 indicates an open circuit in the ECM/PCM power relay control, often leading to degraded engine performance and safety risks. Symptoms include illuminated dashboard warnings, inconsistent engine behavior, increased fuel consumption, and potential stalling issues. Causes span from a faulty ECM power relay and damaged wiring to corrosion and poor electrical…

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The P0684 code in Volkswagen vehicles marks a communication failure between the glow plug control module and the Powertrain Control Module (PCM), crucial for diesel engines. Symptoms like engine starting difficulties and misfires are common, especially in cold weather. Diagnostic steps include using an OBD-II scanner, checking wiring, and testing the glow plug module. Repairing…

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The P0680 Volkswagen code identifies a malfunction within the ECM/PCM power relay sense circuit. This circuit is crucial for the vehicle's ECM and PCM to operate effectively, and its failure can lead to several engine issues. Symptoms include difficulty starting, especially in cold weather, rough idling, misfires, and increased exhaust smoke. Common causes range from…

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