DTC codes / P26xx · Computer and output circuits / P26F3
P26F3 indicates that the powertrain control module (PCM) has commanded the starter relay B circuit on, but the circuit feedback indicates the relay contacts remain open, so the engine will not crank. The PCM detects a mismatch between the requested relay state and the actual electrical state of the relay control 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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