Universal (All Makes) Vehicle (OBD-II)
Severity:Common Causes
- map[cause:Short to ground in the coolant pump control wire]
- map[cause:Failed electric coolant pump with an internal short]
- map[cause:Damaged pump wiring harness from heat or abrasion]
- map[cause:Corroded or loose pump connector]
- map[cause:Blown fuse in the coolant pump circuit]
How to Fix It
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Check the coolant pump fuse — this is the quickest first check.
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Inspect the pump wiring harness near the engine for heat damage or chafing.
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Test for shorts to ground in the control wire with the pump disconnected.
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Check pump motor resistance — a very low reading means an internal short.
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Replace the electric coolant pump if wiring tests pass and the pump fails resistance checks.
Frequently Asked Questions
Which vehicles use an electric auxiliary coolant pump?
Turbocharged vehicles commonly use them to cool the turbo after shutdown. Hybrid and electric vehicles also use them extensively. Some naturally aspirated engines use them too for heater circulation.
Can P2600 cause overheating?
Yes, especially in turbocharged vehicles. The turbo relies on continued coolant flow after shutdown. A failed pump can cause 'heat soak' damage to the turbo bearings.
How much does an auxiliary coolant pump cost?
Most auxiliary pumps cost $50–$200. Labor is usually 1–2 hours. Act promptly to protect the turbocharger.