P3002
HV ECU Communication Malfunction
Severity
🔴 HighCan you drive?
Do not drive — repair immediately
Approx. repair cost
$167–556 (est.)
Symptoms
- Check Engine light comes on
- The car goes into emergency mode
- Reduced engine power
- Problems with charging a high-voltage battery
- Inability to start the hybrid system
Causes
- Malfunction of the high voltage control unit (HV ECU)
- Damage to the CAN bus wiring harness
- Poor contact in connectors
- Control unit power supply problems
- Corrosion or oxidation of contacts
How to Fix
- Check the condition of the wiring harness and connectors
- Check power and grounding of HV ECU
- Scan other modules for communication errors
- If necessary, replace the high-voltage control unit
- Repair only from an authorized dealer