Damaged, chafed or corroded wiring in the fan 2 sense or feedback circuit (open circuit); Loose, corroded or pushed-out pin in the fan 2 connector or the control unit connector; Faulty battery cooling fan 2 (internal fault or failed speed feedback); Blocked or obstructed fan or ducting preventing the fan from turning and giving valid feedback; Blown fuse or faulty relay or supply to the fan circuit; Fault inside the battery management or fan control unit, or outdated software where the manufacturer has issued a fix.

P0D5F

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

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
D: AreaReserved
5F: FaultThe specific fault in that area

What it means

P0D5F means the control unit that manages the hybrid or EV battery pack cooling has detected an open circuit or no valid signal on the sense circuit for battery cooling fan 2. The unit expects a feedback or monitoring signal from that fan and did not see it, so it cannot confirm the fan is working. Fan numbering and the layout of the circuit depend on the vehicle, so check the manufacturer's information for which fan is 'fan 2'.

Symptoms

Hybrid or EV system warning light or malfunction indicator lamp on
Battery cooling fan noise absent, constant or erratic
High voltage battery temperature rising or reduced power output
Reduced charging rate or limited performance (limp mode)
Fan blowing continuously at high speed

Possible causes

Damaged, chafed or corroded wiring in the fan 2 sense or feedback circuit (open circuit)likely
Loose, corroded or pushed-out pin in the fan 2 connector or the control unit connectorlikely
Faulty battery cooling fan 2 (internal fault or failed speed feedback)likely
Blocked or obstructed fan or ducting preventing the fan from turning and giving valid feedbackpossible
Blown fuse or faulty relay or supply to the fan circuitpossible
Fault inside the battery management or fan control unit, or outdated software where the manufacturer has issued a fixrare

How to diagnose

Read all stored and pending codes and the freeze frame data, noting battery temperature and vehicle state when the fault set, and check for other fan or battery temperature codes
Check for any technical service bulletins or software updates for this model
Visually inspect fan 2, its ducting and intake for debris, blockage or damage, and listen for the fan running when commanded
Inspect the fan wiring and connectors for chafing, water ingress, corrosion and poor pin tension
Check the fuse and relay for the fan circuit and the supply and earth at the fan connector, following the manufacturer's wiring diagram
Using a bidirectional scan tool, command the fan on and off and compare the commanded and actual speed readings
With the system safely isolated, test the sense circuit for continuity, short to earth and short to voltage against the wiring diagram
Only after the wiring and fan are proven good, investigate the control unit

How to fix

Repair or replace damaged wiring in the sense circuit, using proper crimps and sealing
Clean, repair or replace corroded or loose connectors and terminals
Replace the faulty battery cooling fan 2 assembly
Clear any blockage from the fan, intake or ducting and refit any loose or damaged ducts
Replace the blown fuse or faulty relay after finding why it failed
Update the software or replace the control unit if the manufacturer confirms it as the cause

Can I keep driving?

Medium severity

The car can usually be driven for a short time, but without proper battery cooling the pack may overheat, which can cut power and shorten battery life. Have it checked soon, and stop driving if a battery temperature or high voltage warning appears.

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