Hybrid Battery Pack Degradation Detected
The hybrid powertrain control module identified an unacceptable voltage variance between cell modules inside the main traction pack. This points to a weak or failing battery group that can no longer hold its designated charge.
High-voltage battery — HV safety certification required.
📊 Check Your Hybrid Cells Before Replacing
Dealerships often quote $4,000+ to replace the entire pack when only a single cell module is weak. Use a Bluetooth OBD-II Scanner paired with the Dr. Prius app to check individual module voltages yourself on your smartphone.
Veepeak OBDCheck BLE+ Scanner →Estimated Cost
$2,800
Repair Time
4-6 hours
Difficulty
Shop Recommended
Can I Fix This Myself?
Professional Service Recommended
This repair involves high-voltage components or specialized equipment.
What professionals will use:
Use the diagnostic wizard below to gather information for your mechanic, then find a local EV specialist using the ad below.
Step-by-Step Fix Instructions
- 1
Inspect rear cabin battery air intake grille for lint and vacuum the cooling fan.
- 2
Connect OBD-II scanner to identify the exact block showing low voltage.
- 3
Run a deep-cycle balance and reconditioning service with a specialized grid charger.
- 4
Open HV safety switch and remove corroded copper bus bars.
- 5
Replace specific weak or shorted cell blocks with precision-matched modules.
- 6
Replace entire hybrid assembly with remanufactured or new factory traction battery.
Check Your Warranty Before Paying
Federal law requires EV battery warranty coverage for 8 years / 100,000 miles minimum. Many manufacturers offer 10-year coverage. An authorized dealership can confirm coverage for your VIN at no charge.
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Step-by-Step Diagnostic Wizard
Answer each question to narrow down the root cause of your P0A80 fault.
Check READY Mode
Step 1 of ~8
Attempt to start the vehicle. Observe the READY light and any triangle or master-warning lights on the instrument cluster.
Does the vehicle fail to enter READY mode (READY light does not illuminate)?
Need hands-on help?
Find a verified EV mechanic or dealership near you.