P0ADD
Hybrid/EV Battery Negative Contactor Control Circuit/Open
P0ADD is an OBD-II diagnostic trouble code meaning: Hybrid/EV Battery Negative Contactor Control Circuit/Open. Common causes: broken wiring to the contactor, control relay malfunction. Estimated repair cost: $56–278.
Symptoms
- Hybrid/electric system won't start
- Check engine light comes on
- Loss of power when driving
- The car goes into emergency mode
- Clicking sound when trying to start
Causes
- Broken wiring to the contactor
- Control relay malfunction
- Damage to the ECU control circuit
- Connector corrosion
- Malfunction of the contactor itself
How to Fix
- Check the integrity of the contactor control circuit
- Check contactor resistance
- Inspect connectors and terminals for corrosion
- Check the operation of the control relay
- Diagnostics of the high-voltage control unit
- Repair only from an authorized dealer
Related codes
Error P0ADD by Vehicle Brand
FAQ
What does the P0ADD code mean?
P0ADD is an OBD-II diagnostic trouble code that indicates: Hybrid/EV Battery Negative Contactor Control Circuit/Open
What causes a P0ADD error code?
The most common causes of P0ADD include: Broken wiring to the contactor; Control relay malfunction; Damage to the ECU control circuit; Connector corrosion.
How do I fix a P0ADD diagnostic trouble code?
To fix P0ADD: Check the integrity of the contactor control circuit. Check contactor resistance. Inspect connectors and terminals for corrosion. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0ADD?
Do not drive — repair immediately
How much does it cost to fix P0ADD?
The estimated repair cost for P0ADD is $56–278. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat