Hybrid Power Control Unit (HPCU) High Voltage Control Circuit Low
This code indicates a low voltage signal in the HPCU control circuit.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The hybrid control unit is not getting the right voltage it needs, which could cause issues with the vehicle's hybrid system.
What the computer is actually seeing
The hybrid power control unit expects a voltage between 10 to 14 volts on its high voltage control circuit. If it sees below 10 volts, it sets this code.
What a healthy reading looks like
Voltage should be between 10-14 volts when the hybrid system is active and running.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the high voltage wiring and connectors for any signs of damage or corrosion. If damaged, repair or replace the wiring/connector. Decision: Is wiring intact? Yes - move to step 2. No - repair first.
- 22. Measure the voltage on the high voltage control circuit with a multimeter while the hybrid system is turned on. Check for voltages between 10-14 volts. Decision: Is voltage within range? Yes - move to step 3. No - investigate further downstream.
- 33. Inspect the hybrid power control unit for any signs of physical damage or obvious failure. Decision: Is the HPCU damaged? Yes - replace HPCU. No - consider further electrical diagnostics or professional help.
Common causes
- Damaged wiring in the high voltage circuit
- Faulty high voltage control circuit connectors
- Failed hybrid power control unit (HPCU)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive; the hybrid system may not function correctly, which could lead to safety issues.
Will this code come back after clearing?
If the underlying issue isn't fixed, the code will likely return.
Why does this code pair with other codes like B1490?
Codes that indicate issues with voltage or wiring tend to trigger simultaneously due to related circuit faults.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →