Lost Communication With Charge Air Cooler Coolant Pump A

Where it lives

For U02A9, the part to look at first is the pump named here.

Check these first

• An open or short in the CAN bus wiring to the coolant pump module
• A failed charge air cooler coolant pump module
• Low voltage or a poor ground at the pump module
• A blown fuse feeding the pump module

What to do next

1. Check the pump module connector for corrosion and pushed pins
2. Inspect the CAN bus wiring to the pump module for opens or shorts
3. Check module power, ground and fuses
4. Test the pump by commanding it with a scan tool
5. Replace the pump module if power, ground and bus test good
6. Clear the code and retest

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