Engine Coolant Pump Performance
The engine coolant pump is not functioning properly or is inefficient.
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 computer monitors how well the engine coolant pump is moving the coolant; a problem means the engine could overheat or not cool efficiently.
What the computer is actually seeing
The engine control module expects a certain flow rate and temperature drop across the engine. If the pump is not moving enough fluid or the temperature difference is too small, it triggers this code.
What a healthy reading looks like
Expected flow rate is typically around 4-6 liters per minute at operating temperature; temperature drop should be at least 10°C (18°F) across the radiator.
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 the coolant level. Is it low? If yes, refill and retest. If no, go to step 2.
- 22. Inspect the wiring and connectors for the coolant pump. Are they damaged or corroded? If yes, repair or replace.
- 33. Test the coolant pump. Refer to the specifications for flow rate. Is it within the expected range (4-6 liters per minute)? If no, replace the pump.
- 44. Check the coolant passages for blockages. Is there any debris? If yes, clean out the passages and retest.
- 55. Test the temperature sensors. Are they functioning properly? If not, replace faulty sensors.
Common causes
- Worn or failed coolant pump
- Clogged coolant passages
- Low coolant level
- Faulty temperature sensors
- Electrical issues with pump wiring
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended; overheating could occur, leading to severe engine damage.
Will this code come back after repair?
If all repairs are done correctly, the code should not return.
Why does this code pair with SPN 3043?
SPN 3043 indicates a malfunction in the coolant temperature sensor, which can affect pump performance.
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