Hybrid Battery Cooling Fan Control Circuit Performance
This code indicates a problem with the hybrid battery cooling fan 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 battery cooling fan isn't working right. It's either not turning on when it should, or it's not operating at the right speed to cool the battery properly. This can lead to overheating and damage to the battery.
What the computer is actually seeing
The hybrid control module monitors the cooling fan's operation through input signal readings. It expects a specific voltage or duty cycle (e.g., 0-100% on PWM signals) based on battery temperature, and if it detects that the actual values are out of range, it sets this fault code.
What a healthy reading looks like
The control module expects the fan to run at specific speeds based on battery temperature. A properly functioning fan should operate at 12-14 volts when on and PWM duty cycles of around 30-80% depending on the situation.
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 battery coolant level; ensure it is within the recommended range. Decision: If low, refill and retest. If okay, go to step 2.
- 22. Inspect the wiring and connectors to the cooling fan for damage or corrosion. Decision: If found, repair or replace. If good, go to step 3.
- 33. Connect a scan tool and check for the current data of the hybrid battery cooling fan duty cycle. Decision: If no command or no response, go to step 4. If operational, test the fan directly.
- 44. Use a multimeter to measure the voltage at the cooling fan connector while attempting to activate the fan. Expected: 12-14 volts. Decision: If voltage is absent, investigate the fan control circuit. If voltage is present, replace the cooling fan.
Common causes
- Faulty hybrid battery cooling fan
- Open or shorted wiring in the control circuit
- Faulty hybrid battery temperature sensor
- Malfunctioning hybrid control module
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally safe but may lead to overheating the hybrid battery if the fan doesn't run, which can impact performance. Fix it soon.
Will this code come back after clearing?
If the underlying issue isn't fixed, yes, it will likely return soon after clearing.
Why does this code appear with others?
Often, it shows alongside other cooling system or hybrid system codes that are all tied to battery performance.
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 →