Engine Coolant Flow Performance Problem
This code indicates an issue with the engine coolant flow.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The engine is not getting enough coolant flow, which can cause it to overheat.
What the computer is actually seeing
The engine control module (ECM) monitors coolant temperature, flow rate, and pressure through various sensors. If the flow is detected to be outside the expected range, this code triggers.
What a healthy reading looks like
Coolant flow rate should typically be between 5 to 15 liters per minute under normal operating conditions.
Guided diagnostic — the DiagCoach way
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.
- 11. Check coolant level — it should be at the recommended level. If low, refill and monitor.
- 22. Inspect for leaks in hoses, radiator, and water pump. Fix any leaks found.
- 33. With the engine running, check the upper and lower radiator hose temperatures; they should be similar if the thermostat is functioning properly (typically around 180-220°F).
- 44. Test the water pump operation. If it's not circulating or making unusual noises, replace it.
- 55. Inspect the thermostat for proper operation. If stuck closed, replace it.
Common causes
- Low coolant level
- Coolant leaks
- Clogged coolant passages
- Faulty water pump
- Thermostat stuck closed
Typical repair cost
$$
Related codes
Frequently asked questions
Can I still drive with this code active?
It's not recommended; overheating can cause severe engine damage.
Will this code come back after repairing?
If the root cause is fixed, it should not reappear unless another issue arises.
Why does this code appear with low coolant?
Low coolant affects the ability to maintain proper flow, triggering the fault.
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