Coolant Heater A Control Module System Voltage

Where it lives

For P2DA7, start at the module the description names.

Check these first

• Low system voltage at coolant heater module A
• A weak battery or charging system
• An open power feed to heater module A
• A poor ground at heater module A
• A faulty coolant heater module A

What to do next

1. Check battery and charging voltage
2. Inspect the heater module A power feed
3. Check the heater module A ground
4. Measure the voltage at the module with the heater on
5. Repair the power or ground fault
6. Clear the code and retest

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