Open circuit, short to ground or damaged wiring in the fan 2 sense or feedback wire; Corroded, loose or water-damaged connector at the fan or control unit; Faulty battery cooling fan 2 (motor or internal electronics failed); Blocked or dirty fan intake or ducting causing the fan to stall or load abnormally; Blown fuse, faulty relay or poor supply or earth to the fan; Fault in the battery management or fan control module, or outdated software where the manufacturer has a known issue.

P0D61

Hybrid/EV Battery Pack Cooling Fan 2 Sense Circuit Low.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
D: AreaReserved
61: FaultThe specific fault in that area

What it means

P0D61 is a generic powertrain code meaning the control unit has detected a low voltage or signal on the sense circuit for hybrid or EV battery pack cooling fan 2. The module monitors the feedback (speed or status) signal from the fan and has seen it sit lower than expected, which suggests a wiring fault, a failed fan or a problem with the fan's control or supply. Exact circuit layout, fan location and monitoring method vary by manufacturer and model.

Symptoms

Hybrid or EV system warning light or malfunction indicator lamp on
Battery pack running hotter than normal or cooling fan noise absent or constant
Reduced power or limited charging and regeneration (limp mode) in warm conditions
Battery cooling fan running at full speed all the time or not running at all
Reduced EV range or the engine running more often on a hybrid

Possible causes

Open circuit, short to ground or damaged wiring in the fan 2 sense or feedback wirelikely
Corroded, loose or water-damaged connector at the fan or control unitlikely
Faulty battery cooling fan 2 (motor or internal electronics failed)likely
Blocked or dirty fan intake or ducting causing the fan to stall or load abnormallypossible
Blown fuse, faulty relay or poor supply or earth to the fanpossible
Fault in the battery management or fan control module, or outdated software where the manufacturer has a known issuerare

How to diagnose

Read all stored and pending codes and the freeze frame data, noting battery temperature and conditions when the code set, and look for other fan or battery temperature codes
Visually inspect the fan 2 wiring, connector and intake duct for damage, debris, moisture or blockage, following the manufacturer's high-voltage safety precautions
Check the relevant fuses and relays, and check the fan's power supply and earth under load
Use a scan tool to command fan 2 on and off and watch the live fan speed or status feedback against the other fan
Listen and feel for fan operation, checking it spins freely and the airflow is normal
With the system safely isolated as per the manufacturer's procedure, test the sense circuit for continuity, short to ground and resistance against the wiring diagram
Check the fan connector terminals for corrosion or poor tension
Check for any applicable software updates or technical bulletins for the battery control module before replacing it

How to fix

Repair or replace damaged wiring and renew corroded or damaged connectors on the sense circuit
Replace the battery cooling fan 2 if it fails the command test or electrical checks
Clear any blockage and clean the intake and ducting, and refit any loose or damaged air ducts
Replace the blown fuse or faulty relay after finding why it failed, and repair poor supply or earth connections
Replace or reprogram the battery control module, or apply an updated calibration, only once the wiring and fan are proven good and a known fault is confirmed

Can I keep driving?

Medium severity

The car can usually be driven for a short time, but with reduced cooling the high-voltage battery may overheat and the car may go into reduced power. Have it checked soon, and avoid hot weather, heavy loads and long journeys until it is fixed.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.