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Home / DTC / P0E1B — Hybrid/EV Battery Pack Coolant Pump B Control Circuit Low

P0E1B — Hybrid/EV Battery Pack Coolant Pump B Control Circuit Low

Detailed page for trouble code P0E1B.

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P0E1B

Generic P — Powertrain

Hybrid/EV Battery Pack Coolant Pump B Control Circuit Low

Brand: Generic
Type: P — Powertrain
Views: UK: 14 EN: 18 RU: 10
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Page language: EN

Causes

  • Blown fuse or tripped relay for the coolant pump power circuit
  • Open or high-resistance wiring or connector (power, ground or control) to pump B
  • Failed coolant pump motor (stalled, worn brushes, internal open)
  • Faulty pump driver or control module output (ECU/BCM/thermal management module)
  • Corroded or poorly seated connector pins
  • Intermittent wiring short to ground or to battery positive

Symptoms

  • Battery pack overtemperature warnings or reduced battery charge/drive performance
  • Cooling system warning lamp or HVAC/charge system messages
  • Reduced vehicle performance or limp-home mode when battery temperature is out of range
  • Unusual noise or lack of noise from pump area when cooling is commanded
  • DTC stored and possibly freeze-frame data showing low current/voltage on pump B circuit

What to check

  • Read and record freeze-frame and live data with a capable scan tool (pump command, pump actual feedback, battery temp)
  • Verify presence and condition of fuses and relays for battery coolant pump circuits
  • Visually inspect pump B connector and wiring harness for damage, corrosion, or water intrusion
  • Listen for pump operation when cooling is commanded; note silence or abnormal noise
  • Check for related codes (other pump circuits, battery pack thermal management)
  • Confirm correct 12V (or specified system voltage) supply and solid ground at pump connector with key on

Signal parameters

  • Supply voltage to pump: typically vehicle accessory voltage (approx. 12–14 V when engine/accessories on); verify specific model service data
  • Control signal: often PWM from thermal management module — 0–14 V range, 0–100% duty cycle (frequency varies by manufacturer; commonly 20–200 Hz)
  • Expected current draw: when operating, small coolant pumps typically draw between 0.5 A and several amps depending on design — check OEM spec
  • Open-circuit condition: near 0 V or infinite resistance between pump power and ground when measured with pump not commanded
  • Short/high-resistance condition: significant voltage drop under command, or measured resistance outside OEM range

Diagnostic algorithm

  1. Safety first: if the vehicle is a hybrid/EV, follow manufacturer HV isolation procedures and wear appropriate PPE before working on high-voltage components or near the pack.
  2. Connect a scan tool and confirm P0E1B along with any related codes and live data (pump B commanded %, actual feedback, pack temperature). Record values.
  3. Attempt to command pump B on via the scan tool and observe live voltage/current at the pump connector. Note whether pump is commanded but no voltage/current is present.
  4. Perform a visual inspection of the pump, connector, and harness for damage, water ingress, corrosion, or pin push-out. Repair as needed.
  5. Check fuses and relays in the pump power circuit; replace any blown fuses and retest. Inspect relay operation and socket.
  6. With the vehicle isolated per safety procedures, measure resistance of the pump motor between power and ground terminals and compare to OEM spec. An open or very high resistance suggests a failed motor.
  7. Backprobe the harness at the thermal management module while commanding the pump. Verify correct control voltage or PWM and a solid return to battery ground. If the module does not send a command, inspect module grounds, supply, and software/calibration.
  8. Perform a wiggle test on harness and connectors while monitoring the circuit to reproduce intermittent faults.
  9. If pump wiring and power are good but pump does not run, replace pump B and retest. After replacement, clear codes and perform a full system test including thermal management routines.
  10. If pump replacement does not resolve the code and wiring/power are confirmed good, suspect control module driver failure. Verify with OEM diagnostic flow before replacing the module.
  11. After repairs, clear DTCs, perform a forced pump on/off test via scan tool and drive/operate vehicle to confirm code does not return and battery temperature management is restored.

Likely causes

  • Loose/corroded connector or harness damage to pump B
  • Failed pump motor (electrical failure or mechanical seizure)
  • Blown inline fuse or faulty relay supplying pump B
  • Faulty control module output or ground drivers

Fault status

⚠️ Status
Battery Pack Coolant Pump B Control Circuit Low — Control module detects low voltage/current or open circuit on battery coolant pump B circuit. Cooling performance may be reduced and adaptive thermal controls may be limited.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

P0E1A P0E1C P0E1D P0A7F P0AFA
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