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Home / DTC / P0D61 — Hybrid/EV Battery Pack Cooling Fan 2 Sense Circuit Low

P0D61 — Hybrid/EV Battery Pack Cooling Fan 2 Sense Circuit Low

Detailed page for trouble code P0D61.

33,912codes
59brands
11,451generic
22,461specific
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Code

P0D61

Generic P — Powertrain

Hybrid/EV Battery Pack Cooling Fan 2 Sense Circuit Low

Brand: Generic
Type: P — Powertrain
Views: UK: 23 EN: 33 RU: 25
AI status
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Page language: EN

Causes

  • Open or short in the fan 2 sense wire
  • Corroded, loose, or disconnected fan connector
  • Failed fan motor or internal fan controller
  • Blown fuse or faulty relay in the fan power circuit
  • Faulty battery management system (BMS) or fan control module
  • Water intrusion or physical damage to harness or fan

Symptoms

  • Hybrid/EV battery pack cooling fan 2 does not run or runs intermittently
  • Battery temperature rising or poor thermal regulation
  • Battery/BMS warning lamp or message on dash
  • Reduced charge rate, performance limits, or system derate by BMS
  • Unusual fan noise if motor is failing

What to check

  • Scan tool: read DTC P0D61, freeze frame, and live BMS/fan data (fan commanded vs. reported)
  • Visual inspection of fan 2 harness, connector, and routing for damage or corrosion
  • Verify fuses and relays in the fan power/control circuit
  • Back-probe fan connector to confirm presence of power and ground with system on
  • Check sense/tach wire for short to ground or short to battery using multimeter
  • Wiggle test harness while monitoring live data for intermittent changes

Signal parameters

  • Supply/power: fan power circuit typically = vehicle accessory/battery voltage (approx. 11–15 V) when powered — manufacturer specific
  • Ground: continuity to chassis ground should be near 0 Ω
  • Sense/tach signal: normally a pulsed signal (square/TTL style) with amplitude up to system voltage (0–~12 V) and frequency proportional to fan speed — consult OEM spec
  • Open/short indications: a short to ground on the sense line will read near 0 V; an open circuit may float or show erratic/zero pulses
  • Fan motor winding resistance: typically low ohms (manufacturer specific); infinite/very high reading indicates open motor

Diagnostic algorithm

  1. Safety: follow high-voltage and vehicle-specific safety procedures before inspecting or disconnecting high-voltage components. Only qualified personnel should work on HV systems.
  2. Connect a compatible scan tool and confirm P0D61 and any related BMS codes. Record live data: commanded fan on/off, reported fan RPM or sense signal, battery temps, and voltage.
  3. Perform a visual inspection of fan 2, mount, wiring, and connector for corrosion, damage, water intrusion, or rodents.
  4. Check related fuses/relays for continuity and correct operation. Replace any blown fuses and test relays.
  5. With vehicle in appropriate safe state (IGN/ready as required), back-probe fan 2 connector: verify power supply voltage and ground presence when fan is commanded on. If power or ground missing, trace upstream to fuse/relay/BMS output.
  6. Monitor the sense/tach wire while commanding the fan ON. Use a multimeter (frequency mode) or oscilloscope to verify pulsed signal; if the sense line reads near 0 V and no pulses when fan commanded, suspect short to ground or failed fan.
  7. Check continuity between the fan connector pins and the control module/BMS connector to find opens or shorts. Repair damaged wiring or connector pins as required.
  8. If wiring and supply are good, disconnect and bench-test the fan assembly (if manufacturer allows) by applying the correct voltage and observing motor operation and tach output. Replace fan assembly if it fails to run or produces no tach signal.
  9. If fan and wiring pass, suspect BMS/fan control module fault. Confirm with manufacturer diagnostics before replacing control modules.
  10. After repairs, clear codes, and perform functional test and temperature / drive-cycle verification to confirm the fault does not return.

Likely causes

  • Connector corrosion or poor pin contact at fan 2
  • Short to ground on the sense wire (low voltage reading)
  • Failed fan speed sensor or tachometer circuit inside the fan assembly
  • Loss of power or ground to the fan (blown fuse, failed relay)
  • Intermittent wiring break in harness (intermittent low on sense line)

Fault status

⚠️ Status
BMS reports low voltage on Hybrid/EV Battery Pack Cooling Fan 2 sense circuit — fan 2 sense signal below expected threshold.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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