Coolant Flow Low

The engine is not getting enough coolant flow, which could lead to overheating and engine damage if not fixed.

The Engine Control Module (ECM) monitors coolant flow through the temperature sensors and flow sensors to maintain optimal engine temperature. It calculates the flow rate and compares it to its expected values.

Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.

1. 11. Check the coolant level in the reservoir. If it's low, top it off and clear the code. Decision: If the code returns, proceed to step 2.
2. 22. Inspect radiator and hoses for any visible blockages or damage. Decision: If items are blocked or damaged, repair or replace as necessary. Clear the code and retest.
3. 33. Test the coolant pump operation. Verify it is functioning correctly and circulating coolant. Decision: If the pump is faulty, replace it.
4. 44. Check for air in the coolant system. If air is present, bleed the system to remove it. Decision: Retest after bleeding the system.
5. 55. Inspect the coolant flow sensor. Use a multimeter to check for proper operation (typically 0.5 to 4.5 volts output). Decision: If the sensor is faulty, replace it.

• Low coolant level in the reservoir
• Blocked or damaged radiator or hoses
• Faulty coolant pump
• Air trapped in the coolant system
• Faulty flow sensor

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