P0CC2

Code

Generic P — Powertrain

Drive Motor A Coolant Pump Control Circuit Range/Performance

Brand: Generic

Type: P — Powertrain

Views: UK: 19 EN: 40 RU: 30

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Page language: EN

Causes

Open, short or high resistance in pump power or ground wiring
Corroded, loose or damaged connector at the pump or controller
Failed coolant pump (electrical motor, bearings or impeller jammed)
Faulty driver output in the powertrain/inverter or body control module
Blown fuse or faulty relay supplying pump circuit
Low battery/aux battery voltage or poor main ground affecting controller output

Symptoms

Malfunction indicator lamp (MIL) or EV/HEV warning lamp illuminated
Drive motor coolant pump fails to energize on command, or runs intermittently
Reduced drive motor cooling leading to elevated drive motor/inverter temperatures or derate/limp mode
Warning message about cooling or reduced performance
Unusual noise from pump (grinding or no rotation)
Coolant temperature higher than normal for load conditions

What to check

Read and record active and pending DTCs and freeze-frame / snapshot data
Verify vehicle is in a safe state to test (follow HV safety procedures if hybrid/electric)
Attempt to command the pump ON/OFF and vary duty cycle with a scan tool; observe response
Check battery/aux supply voltage with key/ready state on and with pump commanded
Inspect pump connector and harness for corrosion, damage, rodent chew, or water ingress
Check fuses and relays related to coolant pump circuit

Signal parameters

Supply voltage: nominal 12 V system (typical operating range ~11–14 V) — verify vehicle-specific spec
Control interface: PWM or switched output from controller (duty cycle 0–100%)
Typical PWM frequency range (vehicle dependent): ~100–1000 Hz — use oscilloscope for exact measurement
Pump current: varies by design; expected steady current when running and higher in stall condition — compare to service spec
Expected electrical behavior: 0 V or battery voltage when commanded OFF/ON for switched output, or modulated voltage for PWM outputs

Diagnostic algorithm

Retrieve codes, freeze frame and live data; note battery voltage and ambient/coolant temperatures when code set.
Confirm safety: if high-voltage system present, follow manufacturer HV isolation procedures before touching high-voltage components.
Use scan tool to command pump ON and OFF. Observe whether the pump runs and whether any other codes appear.
Backprobe pump connector while commanding pump. Verify presence of supply voltage and expected control signal (steady battery voltage or PWM). Record duty cycle/frequency with scope if PWM.
If no control signal from controller, check fuses/relays and continuity of supply circuit from fuse/relay to pump connector. Repair/replace as needed.
If correct control signal present but pump does not run, isolate pump and apply known good 12 V supply briefly to verify pump motor operation and listen/feel for rotation. If pump runs when directly powered, suspect wiring or controller driver.
If pump draws excessive current or is stalled when directly powered, replace pump and inspect coolant path for blockage.
If pump does not run when directly powered and electrical resistance is abnormal (open or short), replace pump.
If pump is good and supply/control wiring is good but no correct control from controller, test or replace controller (powertrain control module/inverter) per service manual guidance.
After repairs, clear codes, perform system tests and road/drive-cycle to confirm no return of code and verify cooling performance.

Likely causes

Intermittent harness/connector fault between controller and pump
Failed pump motor (electrical winding or brush/commutator problem)
Failed powertrain control/inverter driver transistor or internal short
Blown fuse or failed relay in pump supply circuit

Fault status

⚠️ Status

Drive Motor A Coolant Pump Control Circuit Range/Performance — controller detected pump circuit output or pump response outside expected parameters (voltage, PWM, current or timing).

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours