Lost Communication With Evaporative Emission System Leak Detection Control Module

Where it lives

For U029F, the part to look at first is the module named here.

Check these first

• Damaged or disconnected wiring to the evaporative emission leak detection module
• A failed leak detection control module
• A low or interrupted power supply to the module
• A software fault in the module
• Corroded connector pins

What to do next

1. Inspect the wiring and connector at the leak detection control module
2. Check the module power supply and ground
3. Scan the module to confirm it is offline
4. Update the module software
5. Replace the leak detection control module if power tests good
6. Clear the code and retest

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