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Home / DTC / P0CED — Hybrid/EV Electronics Coolant Pump A Enable Circuit

P0CED — Hybrid/EV Electronics Coolant Pump A Enable Circuit

Detailed page for trouble code P0CED.

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P0CED

Generic P — Powertrain

Hybrid/EV Electronics Coolant Pump A Enable Circuit

Brand: Generic
Type: P — Powertrain
Views: UK: 16 EN: 16 RU: 14
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Page language: EN

Causes

  • Open or short in the pump enable/control wiring
  • Corroded, loose or damaged connector at the pump or controller
  • Blown fuse or faulty relay supplying pump power or enable circuit
  • Failed coolant pump motor or internal driver
  • Faulty inverter/vehicle control module (pump driver) or software issue
  • Water intrusion or contamination of connector/harness

Symptoms

  • Hybrid/EV coolant pump A fails to run when commanded
  • HV battery / inverter / power electronics temperature warnings or faults
  • Reduced traction power, limp-home or derated system operation
  • Illuminated master warning light or hybrid system warning
  • Possible abnormal temperatures for power electronics under load
  • Diagnostic trouble codes stored for coolant pump or thermal management

What to check

  • Read and record all related DTCs and freeze-frame/fault data with a scan tool
  • Inspect pump connector and wiring for corrosion, damage, chafing or water ingress
  • Verify fuses and relays for the pump circuit and replace if blown or faulty
  • Monitor live data: pump enable command status and pump feedback (if available)
  • Check for correct supply voltage at pump power pins with key ON and when commanded
  • Measure continuity and resistance of enable/control circuit back to the controller

Signal parameters

  • Enable/control signal: typically a switched supply or PWM command — expect ~0 V (off) and ~5–12 V (on) depending on manufacturer; consult service manual for exact levels
  • PWM frequency (if used): typically in the low hundreds to a few kHz (e.g., 100–2000 Hz) — verify with scope
  • Pump supply voltage: near battery/12 V or vehicle low-voltage supply when key ON and when commanded
  • Typical running current: small coolant pumps often draw ~1–10 A depending on power rating; check actual spec for vehicle
  • Static motor resistance: low ohm range (consult service data); open or very high resistance indicates a broken winding

Diagnostic algorithm

  1. Safety first: follow manufacturer hybrid/EV procedures. Place vehicle in Park, isolate high-voltage system if required and use appropriate PPE before working on high-voltage components or associated connectors.
  2. Use a scan tool to read P0CED and any related codes. Note when the fault set (freeze frame) and any relevant temperatures or voltages.
  3. With ignition ON (but with HV system handled per procedures), observe live data for the pump enable command while commanding the pump ON via the scan tool (bi-directional test).
  4. Measure voltage at the pump connector power and enable terminals while commanding ON. Expected: enable command present and supply voltage at pump power. If command present but pump not running, suspect pump or pump ground.
  5. If enable command is absent, trace enable/control circuit back to the controller. Check connector pins, continuity, and for shorts to ground or battery using a DVOM and wiggle testing.
  6. Inspect and test all fuses, relays and wiring harness sections for corrosion, damage, or water intrusion. Repair or replace as required.
  7. Measure pump current while commanded ON. No current or very low current with correct enable indicates an open motor or internal pump electronics failure; excessive current indicates seized or shorted motor.
  8. If wiring and pump check good, test or substitute the controller/driver module if allowed by service manual. Check for related firmware/TCU/ECU updates.
  9. After repairs, clear codes and perform verification run under load to confirm normal operation and that code does not return.
  10. Document repairs and advise customer about any conditions observed (corrosion, water entry, damage) that could cause recurrence.

Likely causes

  • Open or intermittent enable wire connection between controller and pump
  • Corroded or damaged connector at pump harness
  • Failed pump motor or pump internal electronics
  • Blown fuse or defective relay in pump power/enable circuit
  • Controller/pump driver fault or software anomaly

Fault status

⚠️ Status
Enable/control circuit fault detected for Hybrid/EV Electronics Coolant Pump A — enable signal absent, intermittent, or out of expected range; pump may not run when commanded.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0CEA P0CEB P0CEC P0CEF P0D00
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