High — Service SoonCode: P0A80

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.

Toyota / Lexus Prius · Camry HV · ES300h · RX450h (2004+)Toyota, Lexus Prius, Camry Hybrid, RX450h, CT200h (2020+)

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:

Toyota Techstream scan toolHV safety PPEBattery voltmeter

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.

Find Dealership

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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?

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