What does code P26D4 mean?

Q: What does code P26D4 mean?

Engine Coolant Pump Supply Voltage Circuit Low. P26D4 means the engine control module (ECM) has detected that the supply voltage circuit for the engine coolant pump is lower than expected, indicating a short to ground, an open circuit, or excessive current draw. The ECM monitors this circuit to ensure the pump receives adequate power for proper coolant circulation, and a low voltage condition can prevent the pump from operating correctly.

DTC codes / P26xx · Computer and output circuits / P26D4

P26D4Engine Coolant Pump Supply Voltage Circuit Low

P26D4 means the engine control module (ECM) has detected that the supply voltage circuit for the engine coolant pump is lower than expected, indicating a short to ground, an open circuit, or excessive current draw. The ECM monitors this circuit to ensure the pump receives adequate power for proper coolant circulation, and a low voltage condition can prevent the pump from operating correctly.

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.