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DTC codes / P0Dxx · Hybrid propulsion / P0D5F

P0D5FHybrid/EV Battery Pack Cooling Fan 2 Sense Circuit/Open

P0D5F indicates that the hybrid or electric vehicle's battery pack cooling fan number two sense circuit is open, meaning the control module cannot detect the fan's feedback signal. The computer expects a specific voltage or current on the sense line but sees a value outside the normal range, which prevents it from confirming the fan is operating correctly.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaHybrid propulsion

Symptoms you may notice

  • Illumination of the hybrid system warning light or service vehicle soon message
  • Often no symptoms besides the warning light, especially if the fan is not needed for current conditions
  • Reduced hybrid system performance or limited power output in some vehicles
  • Possible overheating of the high-voltage battery pack during heavy use or fast charging
  • Audible cooling fan may run continuously or not at all, depending on the failure mode
  • In rare cases, the vehicle may enter a fail-safe mode that restricts driving speed

Common causes, most likely first

  1. Open or damaged wire in the fan sense circuit, such as a broken conductor or corroded connector
  2. Failed battery pack cooling fan number two assembly, including its internal sense electronics
  3. Poor electrical connection at the fan connector or at the control module harness
  4. Faulty cooling fan control module or hybrid battery control module
  5. Blown fuse or relay that supplies power to the fan circuit (though this often sets additional codes)
  6. Contamination or debris blocking the fan, causing it to overheat and damage the sense circuit
  7. Water intrusion or corrosion in the fan connector or wiring harness

How to diagnose and fix it

  1. Perform a visual inspection of the fan, connector, and wiring for obvious damage, corrosion, or debris
  2. Check the fan fuse and relay, and verify power and ground at the fan connector
  3. Measure resistance of the sense circuit from the fan connector to the control module to check for an open
  4. Back-probe the sense circuit at the control module and compare voltage with the factory specification
  5. Substitute a known-good fan or simulate the sense signal to confirm whether the fan or module is at fault
  6. Repair or replace the faulty wiring, connector, fan assembly, or control module as diagnosed
  7. Clear the diagnostic trouble codes and verify the repair by running the fan and monitoring live data

Before you replace the cooling fan

  • A common oversight is assuming the fan motor is bad when the actual problem is a corroded terminal in the sense circuit, which costs far less to fix.
  • The sense circuit is a low-current signal path, so even slight corrosion or a loose pin can set this code without affecting fan operation under normal conditions.
  • Some vehicles will not set this code until the battery pack reaches a temperature that commands fan operation, so a test drive may be needed to reproduce the fault.
  • This code can be set by a faulty control module that misreads a good signal, so always verify the sense circuit integrity before condemning the module.
  • Related codes for fan control or battery temperature may also be present, and diagnosing those first can save time and prevent unnecessary parts replacement.

Can I keep driving with P0D5F?

You can generally continue driving, but avoid aggressive driving, sustained high speeds, and fast charging until the fault is repaired, as these conditions increase battery heat and may trigger reduced power or a fail-safe mode.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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