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Home / DTC / P0CEB — Hybrid/EV Electronics Coolant Pump A Control Circuit Low

P0CEB — Hybrid/EV Electronics Coolant Pump A Control Circuit Low

Detailed page for trouble code P0CEB.

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P0CEB

Generic P — Powertrain

Hybrid/EV Electronics Coolant Pump A Control Circuit Low

Brand: Generic
Type: P — Powertrain
Views: UK: 14 EN: 20 RU: 12
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Page language: EN

Causes

  • Blown fuse or tripped circuit protection for pump power or control
  • Open or shorted wiring between pump and control module (short to ground)
  • Poor or corroded connector or terminal at the pump or control module
  • Failed pump motor (internal short or open)
  • Faulty pump driver or vehicle control module output stage
  • Low 12V/HV supply or poor ground to pump or control module

Symptoms

  • Hybrid/EV electronics overtemperature warnings or reduced power mode
  • Cooling pump not running when commanded
  • Cooling system temps rising at the power electronics or inverter
  • Illumination of warning/information lamp for hybrid/EV system
  • Diagnostic trouble code P0CEB stored, possibly with related coolant pump or fan codes

What to check

  • Read freeze frame and related pending/confirmed codes; note vehicle conditions when fault set
  • Visually inspect pump, harness, and connectors for damage, corrosion, or water intrusion
  • Check fuses, fusible links, and relays for pump power circuit
  • Verify 12V (or designated supply voltage) and ground presence at the pump connector with key on
  • Back-probe control pin while commanding pump ON with a scan tool; measure voltage and waveform
  • Measure pump motor resistance with connector disconnected (compare to spec)

Signal parameters

  • Expected control voltage when commanded ON: approx. battery voltage (12V system) or module-specified supply; low =
  • Expected control signal when OFF: near 0 V or high-impedance depending on design
  • PWM control frequency (if used): typically 200–2,000 Hz (refer to manufacturer spec)
  • Pump motor resistance (approximate): typically 0.5–10 ohms for brushed/BLDC stages — verify OEM spec
  • Expected pump current draw while running: typically 0.5–15 A depending on pump and system — verify OEM spec
  • A stuck-low control line or near-ground on the power lead indicates short to ground or driver short

Diagnostic algorithm

  1. Retrieve codes and freeze frame; record operating conditions and any related codes (coolant temp, battery voltage, other pump codes).
  2. Visually inspect pump assembly, wiring harness, and connectors for damage, corrosion, water, or crushed wiring.
  3. Verify power and ground at the pump connector with key ON (or service mode). If supply fuse or relay is open, repair or replace as needed and retest.
  4. Back-probe the control and power pins while commanding the pump ON with a scan tool. Note voltage and waveform. If control line stays low (
  5. With pump disconnected, measure DC resistance of pump motor and compare to specification. An open or very low (near short) reading indicates a failed pump.
  6. Bench-test the pump by applying correct supply voltage directly to the pump (observe safety for HV systems). If pump runs normally, focus on wiring/control module/driver. If not, replace pump.
  7. Check for shorts to ground or to supply in the harness: use a short-finder or insulation tester as appropriate for the system voltage (follow workshop safety and HV isolation procedures).
  8. Inspect and test the control module output pin with an oscilloscope if available to view PWM or switching behavior. If the module output is faulty, verify module supply voltages and grounds before replacing module.
  9. Repair any wiring/connectors or replace failed pump or driver as indicated by tests. Clear codes and perform functional test, command pump through multiple cycles, and monitor temps and currents to confirm repair.
  10. If intermittent, perform road/drive cycle or extended command test to stress the circuit and verify durability of repair.

Likely causes

  • Intermittent or corroded connector at pump causing low/grounded signal
  • Damaged wiring harness rubbed through and shorting to chassis ground
  • Failed pump motor drawing abnormal current and pulling control low
  • Blown in-line fuse or failed relay controlling pump power
  • Defective inverter/ATCM or control module driver stage

Fault status

⚠️ Status
Control circuit low for Hybrid/EV electronics coolant pump A — indicates low or grounded control/power signal when pump is expected to run.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-3 hours

Similar codes

P0CE9 P0CEA P0CEC P0480 P0481
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