P0C4A

Code

LAND ROVER P — Powertrain

Battery for electric / hybrid vehicle - Pump control performance refrigeration

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 22 EN: 68 RU: 25

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open, shorted or corroded wiring/connectors between pump and control module
Blown fuse or faulty relay for pump power supply
Faulty pump motor (electrical or mechanical failure)
Low refrigerant or blockage in refrigeration circuit reducing pump load
High resistance in supply or ground circuits
Faulty battery management / HVAC control module or software fault

Symptoms

Battery thermal management cooling reduced or not operating
HVAC or refrigerant system performance degraded
Battery temperature warnings or reduced charge/drive performance
Service or warning lamp(s) illuminated (HV/battery/HVAC related)
Stored fault code(s) and possible derate of battery charging/cooling functions
Unusual noise from pump (grinding, whine) or no audible pump operation

What to check

Read and record DTCs and freeze-frame data with a capable diagnostic tool
Inspect wiring, connectors and grounds at the pump and control module for damage/corrosion
Verify relevant fuses and relays for pump power
Command pump ON/OFF with scan tool and observe response
Measure supply voltage and ground at the pump connector during command
Measure pump current draw with appropriate meter/ammeter clamp while commanded

Signal parameters

Control signal type: PWM or switched supply (refer to service manual for exact type)
Expected supply voltage at pump when commanded: see manufacturer spec (typically battery auxiliary voltage or specified HV subsystem voltage)
Typical PWM duty cycle: 0–100% depending on requested pump speed (frequency per service spec)
Expected pump current draw: compare measured amps to service specification (abnormally high or low indicates fault)
Resistance of pump motor windings at de-energized state: compare to spec
Refrigeration circuit pressure/temperature values: should be within expected range for operating conditions

Diagnostic algorithm

Retrieve all related DTCs and freeze-frame data; note operating conditions when code set.
Visually inspect pump, wiring harness, connectors and ground points for damage, corrosion or water ingress.
Verify fuses/relays for the pump circuit; replace if blown and retest.
Using a diagnostic tool, command the pump ON and observe instrumentation: confirm control command present and check for pump response (sound/vibration).
Measure voltage at the pump power pin and ground while commanded; compare to manufacturer values. If no voltage, trace back to relay/fuse/control module.
Measure current draw while pump is commanded. Low/no current suggests open circuit or failed motor; excessive current suggests mechanical binding or short.
If electrical supply and command are correct but pump does not run, remove and bench-test or replace pump per safe high-voltage procedures as applicable.
Check refrigeration pressures and components for restrictions, collapsed lines, or low refrigerant that could affect pump load.
Inspect pump for mechanical damage (impeller, bearings) and replace if required.
After repairs, clear codes, perform relearns or calibrations per service manual, then perform a road/operational test to confirm correct operation and monitor for return of code.

Likely causes

Damaged wiring or poor connector/corrosion at the pump harness
Pump motor bearing/seizure or internal failure
Failed power supply fuse or relay
Control module commanding PWM but pump not responding (open circuit or motor fault)
Restricted refrigerant flow or clogged filter/drier creating abnormal load
Software or calibration issue in the battery/HVAC control module

Fault status

⚠️ Status

Pump control performance for the battery refrigeration circuit is outside expected parameters. Cooling may be reduced and a fault is stored. Inspection of pump, wiring, power supply, and control module is required.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.5-3.0 hours

Similar codes

Repair manuals

Manual library for LAND ROVER

413

Browse 413 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

Your experience will help others

+100 karma for a short comment :)

Was this AI description helpful?

Your feedback helps improve AI descriptions.

👍 Like 0 👎 Dislike 0

Send to email

P0C4A — Battery for electric / hybrid vehicle - Pump control performance refrigeration