P023A

Code

LAND ROVER P — Powertrain

Cooling pump control of the charge air cooler - circuit open

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 11 EN: 329 RU: 46

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Page language: EN

Causes

Open or broken wiring in the pump supply or control circuit
Corroded, loose or damaged connector at the pump or ECM
Blown fuse or failed relay supplying the pump
Failed pump motor (open winding)
Faulty ECM/PCM driver output
Poor ground connection for pump circuit

Symptoms

Malfunction Indicator Lamp (MIL)/Check Engine Light illuminated
Intercooler/charge-air cooling pump does not run when commanded
Higher than normal intake air temperatures after turbocharging
Reduced engine performance or turbo derate in some conditions
Possible stored additional codes for boost or temp sensors

What to check

Read freeze frame and live data with a diagnostic scanner; note whether PCM commands the pump
Visually inspect pump, wiring harness and connectors for damage, corrosion or contamination
Check related fuses and relays (pump supply) for continuity and operation
Backprobe pump connector while commanding pump ON to verify supply voltage and ground switching
Measure resistance of pump motor winding (with connector disconnected)
Perform continuity check between pump connector and ECM pins

Signal parameters

Ignition ON, pump supply circuit: battery voltage ~12 V (minus small system drop)
When PCM commands pump: control output may be switched ground or PWM; voltage at control pin will toggle between near 0 V and battery voltage or be a PWM waveform
Open-circuit condition: multimeter shows infinite/OL or very high resistance between pump terminals or between pump positive and ECM control pin
Pump motor resistance (typical range): a few ohms to tens of ohms — check manufacturer spec; an open reading indicates a failed motor
Ground continuity: near 0 Ω between pump ground and vehicle chassis/engine ground

Diagnostic algorithm

Retrieve all codes and freeze-frame data. Note whether PCM commands the pump and under what conditions code set.
Visually inspect pump, harness and connectors for damage, corrosion or coolant contamination. Repair obvious damage.
Check fuses and relays for the pump circuit; replace if blown or malfunctioning.
With connector disconnected, measure pump winding resistance; if open/infinite, replace the pump.
Reconnect, backprobe the pump connector. With ignition ON and while commanding the pump ON via scanner, verify battery supply at the power pin and switching at the control pin (or PCM-provided ground).
If supply is present but control is open/inactive, check continuity between the PCM control pin and the pump connector. Repair open wiring or connector faults.
If wiring and pump are good but no proper control signal from PCM, confirm PCM output with scope for PWM/drive waveform. If PCM does not command and wiring is good, consider ECM/PCM fault and follow manufacturer procedures.
After repairs, clear codes, run actuator/test drive to confirm pump operates under expected conditions and code does not return.

Likely causes

Corroded/loose connector at the cooling pump
Open wire or broken conductor in harness between pump and ECM
Pump motor internal open-circuit
Blown fuse or failed pump relay
ECM output transistor failed (less common)

Fault status

⚠️ Status

Open circuit detected in charge-air cooler cooling pump control; pump failed to show expected electrical feedback when commanded.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.0 hours

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P023A — Cooling pump control of the charge air cooler - circuit open