P023B

Code

LAND ROVER P — Powertrain

Cargo Air Conditioning Refrigeration Pump Control - Circuit low

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 15 EN: 118 RU: 29

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Page language: EN

Causes

Blown fuse or faulty relay in the cargo A/C pump power/control circuit
Open, high-resistance or short-to-ground wiring between module and pump
Corroded, loose or damaged connector at the pump or module
Faulty cargo A/C refrigeration pump (motor/winding short or open)
Faulty body/control module driver output
Low battery / poor main power or ground connection

Symptoms

Cargo area air conditioning not cooling or reduced cooling
Cargo refrigeration pump does not run when requested
DTC P023B stored and a related MIL/watchdog message may be present
Blown fuse(s) for accessory/AC pump circuit
Intermittent pump operation (work when harness moved)

What to check

Read and record all stored codes and freeze-frame data with a capable scan tool
Attempt to command/activate cargo A/C pump using bi-directional controls while observing live data
Inspect fuses and relays for the cargo A/C pump circuit; replace suspect items
Visually inspect harness and connectors at the pump and control module for corrosion, damage, moisture or loose pins
Measure battery voltage at vehicle battery and at the pump connector with key ON and pump commanded
Measure voltage at the pump supply and control pins, and check ground continuity

Signal parameters

Battery supply voltage at pump feed: nominally ~11–14 V with engine running; should be near battery voltage when pump commanded ON
Control/driver output: when pump is commanded ON the control output should present either battery voltage (switched supply) or a PWM signal referenced to ground — not a continuous low (≈0 V)
Pump current draw: varies by design; expect a measurable current (typically a few amps). Very low or zero current indicates open circuit; excessive current indicates internal pump fault or short
Motor winding resistance: low ohms (manufacturer-specific). Very high or infinite resistance indicates open winding; very low could indicate shorted winding

Diagnostic algorithm

Connect a diagnostic scan tool. Record P023B and any other related codes; note freeze-frame data and ability to command the pump.
Check battery voltage and primary fuses/relays for the cargo A/C pump circuit. Replace any blown fuses and re-test.
With the pump commanded ON, measure voltage at the pump power terminal and control terminal at the harness connector. Observe whether voltage reaches battery voltage or a proper PWM signal.
If no voltage at connector but fuse/relay OK, back-probe wiring toward module; check for short-to-ground or open circuit. Inspect connector pins for corrosion, bent pins, or water intrusion.
Bench test the pump by applying fused battery power directly to the pump ground and supply to confirm it runs and measure current draw. If pump does not run or draws excessive current, replace pump.
If pump works when directly powered and wiring is intact, test or substitute the relay and check the module driver output. Check ground continuity between pump ground and chassis/battery negative.
Repair or replace damaged wiring, connectors, relay, fuse or pump as indicated. If wiring and pump are good but module output is faulty, consider module repair/replacement following manufacturer procedures.
Clear codes, perform functional test (command pump several times), and confirm no reoccurrence of the code under the original conditions. Retest vehicle operation and re-scan for codes.

Likely causes

Corroded or loose connector at the cargo pump harness
Blown fuse or failing relay supplying the pump
Open or shorted wiring (pinched/abraded harness) between module and pump
Failed pump motor drawing excessive current or not completing circuit
Faulty control module driver or internal short in module

Fault status

⚠️ Status

Cargo A/C refrigeration pump control circuit low — control/supply voltage below expected when pump commanded; pump may not operate.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.5 hours

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P023B — Cargo Air Conditioning Refrigeration Pump Control - Circuit low