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DTC codes / P26xx · Computer and output circuits / P26A8

P26A8Engine Coolant Bypass Valve A Position Sensor Circuit Intermittent/Erratic

P26A8 indicates that the powertrain control module (PCM) has detected an intermittent or erratic signal from the position sensor inside the engine coolant bypass valve A. The computer expects a smooth, consistent voltage or pulse-width signal as the valve moves, but it is seeing sudden drops, spikes, or missing data that do not match commanded valve position.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaComputer and output circuits

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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