U0645
Lost Communication With Active Air Dam Module
U0645 is an OBD-II diagnostic trouble code meaning: Lost Communication With Active Air Dam Module. Common causes: open or short circuit in the spoiler module circuit, active spoiler module malfunction. Estimated repair cost: $56–278.
Symptoms
- Active spoiler does not work
- Check Engine light comes on
- Possible error messages on the dashboard
- Reduced aerodynamic performance at high speeds
- The car may go into emergency mode
Causes
- Open or short circuit in the spoiler module circuit
- Active spoiler module malfunction
- Problems with connectors or wiring harness
- Failures in ECU software
- Module power problems
How to Fix
- Check the integrity of the power supply and grounding circuits of the module
- Inspect connectors and wiring harness for damage
- Check the functionality of the active spoiler module
- Scan the system for other errors
- Update ECU software if necessary
- Repair only from an authorized dealer
Related codes
Error U0645 by Vehicle Brand
FAQ
What does the U0645 code mean?
U0645 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Active Air Dam Module
What causes a U0645 error code?
The most common causes of U0645 include: Open or short circuit in the spoiler module circuit; Active spoiler module malfunction; Problems with connectors or wiring harness; Failures in ECU software.
How do I fix a U0645 diagnostic trouble code?
To fix U0645: Check the integrity of the power supply and grounding circuits of the module. Inspect connectors and wiring harness for damage. Check the functionality of the active spoiler module. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0645?
Yes, but get it checked soon
How much does it cost to fix U0645?
The estimated repair cost for U0645 is $56–278. Actual cost depends on your vehicle, location, and labor rates.
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