OBD Engine Coolant Pump Clutch Control Circuit Low
What it means
P26D9 stands for Engine Coolant Pump Clutch Control Circuit Low. P26D9 is a P code, so the fault sits in the engine, transmission and emissions systems. For P26D9, the second digit places it in computer output circuits. For P26D9, work through the cause list below, cheapest checks first.
Where it lives
For P26D9, the pump sits on the circuit this code reports. The description of P26D9 reports a fault at the pump.
What to check first
For P26D9, pull the connector and inspect the terminals for spread, corrosion or backed-out pins before testing anything else.
Check these first
- P26D9: Faulty sensor or actuator in the control circuit
- P26D9: Wiring, connector, or fuse problem for the affected output
- P26D9: Low or unstable system voltage from the battery or charging system
- P26D9: Failed PCM/ECM or a software error
- P26D9: Poor ground connection for the control module
What to do next
P26D9 reports from the computer output circuits system. These steps cover P26D9 in general, and the exact cause on your vehicle can differ from the cause named above.
- P26D9: Verify battery voltage and charging system health first
- P26D9: Read all related module codes with an OBD-II scanner
- P26D9: Inspect wiring, connectors, and grounds for the affected circuit
- P26D9: Test the sensor or actuator with live data and actuation commands
- P26D9: Check for PCM software updates or TSBs before replacing modules
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Updated
Generic SAE J2012 definition. Last updated 2026-08-30.