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how do i fix code P2601 on 2009 sts cadillac?

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Start by inspection/changing the Auxiliary Coolant Pump, if the relay is OK you may have to replaced the pump.

P2601 CADILLAC - Auxiliary Coolant Pump Performance

Read more: https://www.autocodes.com/p2601_cadillac.html

2009 Cadilac STS Auxiliary Coolant Pump Location

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