P023C

Code

LAND ROVER P — Powertrain

Control of the cargo air conditioning pump - high circuit

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 17 EN: 22 RU: 20

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Short to battery (positive) on the pump control circuit
Faulty cargo A/C pump with internal short or failed motor
Stuck or welded relay supplying pump power
Failed control output transistor inside BCM/ACM/module
Corroded or damaged connector or wiring (chafing, pinched insulation)
Poor or missing ground causing abnormal circuit behavior

Symptoms

DTC P023C stored and/or MIL or warning message related to cargo A/C
Cargo area A/C pump may run continuously or fail to run depending on fault
Reduced or no cooling from cargo A/C circuit
Possible battery drain or blown fuses
Intermittent operation of cargo A/C pump or loss of control (on/off/PWM)

What to check

Read freeze frame and freeze data; note conditions when code set (ignition, engine running, A/C demand)
Visual inspection of pump, connector, wiring harness, and relay/fuse locations for damage, corrosion, or water entry
Check relevant fuses and relays for proper operation
Back-probe pump control connector: measure voltage with key ON, A/C OFF and with A/C ON
Disconnect pump and check control circuit voltage to see if voltage is present with pump removed (indicates short to battery or stuck output)
Measure resistance of pump motor windings (compare to specification) and measure current draw when energized

Signal parameters

Control signal type: switched power or PWM from body/control module
Expected voltage (typical): ~0 V when OFF, battery voltage (≈ 11–14.5 V) when ON; PWM duty 0–100% when modulated
Expected current draw: varies by pump design (commonly 1–10 A); check OEM specification
If PWM-controlled: frequency typically low-to-moderate (tens to a few hundred Hz) depending on design
High-circuit fault means measured voltage is above expected threshold when module expects low or controlled value

Diagnostic algorithm

Retrieve and record all related codes and live data. Note conditions when the code set (engine on/off, A/C on, battery voltage).
Visually inspect wiring, connectors, and pump area for corrosion, damage, or water ingress. Repair obvious damage.
Check fuses and relay(s) for the cargo A/C pump; replace if faulty. Verify relay contacts are not welded.
With ignition ON, back-probe the pump control connector. Observe voltage with A/C demand OFF and ON. If voltage is present when it should be low, investigate short-to-battery or module output fault.
Disconnect the pump connector. Measure voltage on the control feed again. If the voltage disappears when disconnected, the pump may be shorted to battery; if it remains, likely a control module/relay fault or short upstream.
Measure pump winding resistance and current draw by applying battery voltage through a fused jumper (follow safety and manufacturer procedures). Compare to spec. Replace pump if out of range or draws excessive current.
Perform wiggle test on harness while monitoring voltage/scan data to locate intermittent faults. Repair or replace damaged wiring and connectors.
If wiring and pump check good, test/replace relay and retest. If control module output still indicates high with correct wiring and no short, consult module diagnostics — reprogram or replace module only after confirming upstream wiring and loads.
Clear codes and verify repair by cycling A/C and monitoring for reappearance of the code and correct pump operation.
Safety note: use appropriate fusing and take precautions when applying power to components; high-current circuits can cause fire or damage.

Likely causes

Short to battery on the pump control wire near the pump
Failed cargo A/C pump motor drawing abnormal current or presenting low resistance
Faulty relay stuck closed or relay coil shorted
Control module (BCM/ACM) output transistor failed and sourcing voltage
Connector corrosion or water ingress at the pump connector

Fault status

⚠️ Status

Cargo A/C pump control circuit — high voltage detected (short/high-side fault).

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

Repair manuals

Manual library for LAND ROVER

320

Browse 320 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

P023C — Control of the cargo air conditioning pump - high circuit