P3030
Disconnection Between Battery And ECU
P3030 is an OBD-II diagnostic trouble code meaning: Disconnection Between Battery And ECU. Common causes: broken ecu power wire, battery terminal oxidation. Estimated repair cost: $6–56.
Symptoms
- The engine stalls or does not start
- Reset ECU adaptations
- Unstable engine operation
- Lost connection with diagnostic equipment
- Check Engine Light Is On
Causes
- Broken ECU power wire
- Battery terminal oxidation
- Faulty main relay
- Wiring harness damage
- Poor contact in ECU connectors
How to Fix
- Check the condition of the battery terminals
- Check the integrity of the ECU power cable
- Check the operation of the main relay
- Inspect the ECU connectors for damage
- Check the integrity of the wiring harness
Related codes
FAQ
What does the P3030 code mean?
P3030 is an OBD-II diagnostic trouble code that indicates: Disconnection Between Battery And ECU
What causes a P3030 error code?
The most common causes of P3030 include: Broken ECU power wire; Battery terminal oxidation; Faulty main relay; Wiring harness damage.
How do I fix a P3030 diagnostic trouble code?
To fix P3030: Check the condition of the battery terminals. Check the integrity of the ECU power cable. Check the operation of the main relay. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P3030?
Do not drive — repair immediately
How much does it cost to fix P3030?
The estimated repair cost for P3030 is $6–56. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat