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DTC codes / P06xx · Computer and output circuits / P06A6
P06A6 indicates that the engine control module (ECM) has detected an out-of-range condition on the reference voltage circuit labeled 'A', which is typically a 5-volt supply shared by multiple sensors. The ECM monitors this voltage and sets the code when the signal falls outside the expected range for a calibrated time, indicating a short, open, or excessive load on the circuit.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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