What it means
The control module detects a high signal in the control circuit for hybrid/EV battery pack cooling fan 2.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
Battery cooling fan 2 depends on a control circuit that carries its operating command or signal. This code sets when the control module detects that the circuit signal is above its calibrated range, which can interfere with the commanded fan operation.
Common causes
Most likely first.
- Short to voltage in fan control wiring
- Fan or fan control circuit fault
- Connector fault
Symptoms
- Hybrid system warning light
- Battery cooling fan may not operate correctly
How to diagnose it
- Record freeze-frame data and compare fan 2's commanded state with its reported status when the high signal was detected.
- Inspect accessible fan 2 wiring and connectors for damage, loose terminals, corrosion, or contact with a voltage source.
- Check whether fan 2 operates during a scan-tool command, if the vehicle supports that test, and note any mismatch with the requested speed or state.
- With the vehicle powered down according to the manufacturer's procedure, test the control wire for a short to voltage and check connector continuity.
- If the wiring and fan pass inspection, test the fan control module output and circuit using the manufacturer's procedure.
Common fixes
- Repair wiring shorted to voltage.
- Secure or repair a loose, damaged, or corroded connector.
- Replace fan 2 if it fails its operational test.
- Repair or replace the fan control module if its output remains out of range.
Can I keep driving?
Because this code may accompany reduced power, avoid high loads and long trips until the fan circuit is checked; the battery may not receive adequate cooling. Stop if power becomes severely limited, and keep clear of high-voltage components.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.