U3020

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

1. Check wake-up circuit for short circuit
2. Check fuses and relays associated with control unit B
3. Inspect the wiring harness for damage
4. Check grounding of control unit B
5. Replace control unit B if necessary

Related codes

Error U3020 by Vehicle Brand