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Diagnostic Fault Information

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.
Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Auxiliary Coolant Pump Relay Coil Ignition Voltage - P2600 1 P2601
Auxiliary Coolant Pump Relay Control P2600, P2602, 2 P2600, P2602, 1 P2600, P2603 P2601
  1. Auxiliary coolant pump inoperative.
  2. Auxiliary coolant pump always ON
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