U3020
Control Module Wake-up Circuit B High
U3020 is an OBD-II diagnostic trouble code meaning: Control Module Wake-up Circuit B High. Common causes: short circuit in wake-up circuit, control unit b fault. Estimated repair cost: $17–111.
Symptoms
- Problems starting the engine
- The control unit does not activate
- Errors in other vehicle systems
- Reduced vehicle performance
- Check Engine Light Is On
Causes
- Short circuit in wake-up circuit
- Control unit B fault
- Relay or fuse problems
- Wiring harness damage
- Grounding problems
How to Fix
- Check wake-up circuit for short circuit
- Check fuses and relays associated with control unit B
- Inspect the wiring harness for damage
- Check grounding of control unit B
- Replace control unit B if necessary
Related codes
Error U3020 by Vehicle Brand
FAQ
What does the U3020 code mean?
U3020 is an OBD-II diagnostic trouble code that indicates: Control Module Wake-up Circuit B High
What causes a U3020 error code?
The most common causes of U3020 include: Short circuit in wake-up circuit; Control unit B fault; Relay or fuse problems; Wiring harness damage.
How do I fix a U3020 diagnostic trouble code?
To fix U3020: Check wake-up circuit for short circuit. Check fuses and relays associated with control unit B. Inspect the wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U3020?
Yes, but get it checked soon
How much does it cost to fix U3020?
The estimated repair cost for U3020 is $17–111. Actual cost depends on your vehicle, location, and labor rates.
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