U0633
Lost Communication With Fan 2
U0633 is an OBD-II diagnostic trouble code meaning: Lost Communication With Fan 2. Common causes: open or short circuit in wiring, fan relay fault. Estimated repair cost: $17–89.
Symptoms
- Engine overheating
- The second cooling fan does not work
- Check Engine Light Is On
- Reduced engine performance
Causes
- Open or short circuit in wiring
- Fan relay fault
- Problems with the engine control unit
- Malfunction of the fan itself
How to Fix
- Check the integrity of the wiring to the fan
- Check fan relay operation
- Check fan circuit fuses
- Check the operation of the fan
- Check control signals from ECU
Related codes
Error U0633 by Vehicle Brand
FAQ
What does the U0633 code mean?
U0633 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Fan 2
What causes a U0633 error code?
The most common causes of U0633 include: Open or short circuit in wiring; Fan relay fault; Problems with the engine control unit; Malfunction of the fan itself.
How do I fix a U0633 diagnostic trouble code?
To fix U0633: Check the integrity of the wiring to the fan. Check fan relay operation. Check fan circuit fuses. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0633?
Limited driving only, diagnose soon
How much does it cost to fix U0633?
The estimated repair cost for U0633 is $17–89. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat