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Home / DTC / P023B — Charge Air Cooler Coolant Pump A Control Circuit Low

P023B — Charge Air Cooler Coolant Pump A Control Circuit Low

Detailed page for trouble code P023B.

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Code

P023B

Generic P — Powertrain

Charge Air Cooler Coolant Pump A Control Circuit Low

Brand: Generic
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse for intercooler/coolant pump circuit
  • Faulty coolant pump (motor) or pump seized
  • Open or high-resistance wiring in pump power or ground circuits
  • Short to ground in the pump power feed
  • Corroded/loose connector at pump or relay
  • Faulty relay or control module driver (ECM/BCM)

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Intercooler/charge-air cooling reduced, higher intake-air temperatures
  • Reduced engine performance or turbo efficiency under load
  • Possible engine derate in some vehicles
  • Overheating of charge-air system components
  • No noise or movement from intercooler coolant pump when commanded

What to check

  • Read and record freeze-frame and any pending codes with a scan tool
  • Visually inspect pump, connectors, wiring harness, relay and fuse for damage or corrosion
  • Check fuse and relay operation for the pump circuit
  • Backprobe pump power and ground while commanding pump on with a scan tool; verify voltage and ground presence
  • Measure pump motor resistance and perform bench test by applying battery voltage (observe current draw and rotation)
  • Perform a wiggle test on wiring harness while monitoring operation to find intermittent faults

Signal parameters

  • Expected drive voltage when commanded: ≈ battery voltage (B+) or PWM up to B+ (typically >10 V when ON)
  • Expected pump current: typically in the 0.5–10 A range depending on pump design (verify factory spec)
  • PWM control duty: 0–100% depending on load and control strategy
  • Circuit continuity: low ohms between pump and ground/power when connector disconnected

Diagnostic algorithm

  1. Retrieve DTCs and freeze-frame data with a scan tool. Clear codes and attempt to re-run to confirm reproducible fault.
  2. Perform a visual inspection of pump, wiring, connectors, fuse, and relay. Repair obvious damage or corrosion.
  3. Check the fuse and relay for the intercooler coolant pump; replace if faulty.
  4. With ignition ON (engine off), backprobe the pump connector. Command the pump ON via scan tool and observe voltage on the power terminal and a good ground on the ground terminal.
  5. If no drive voltage at connector when commanded, check relay coil and control circuit between ECM and relay. Verify relay operation and supply voltage to relay.
  6. If drive voltage is present but pump does not run, disconnect pump and measure its resistance. Bench-test the pump with direct battery power (observe rotation and current draw). Replace pump if it does not operate or draws excessive current.
  7. If pump is not receiving correct voltage and relay and fuses are good, test wiring for open/short to ground/voltage and inspect ECM ground connections. Repair wiring or connectors as needed.
  8. If wiring and pump test good but ECM does not command or reads low signal, consider ECM driver fault and consult manufacturer procedures before replacing ECM.
  9. After repairs, clear codes and verify system operation on-road and with scan-tool commanded tests. Confirm no reoccurrence of the DTC.
  10. (Safety) Isolate battery when doing major wiring repairs and follow safe battery/disconnection procedures.

Likely causes

  • Blown fuse or failed relay to pump
  • Corroded/loose connector at the coolant pump
  • Failed pump motor (no rotation or high resistance)
  • Open/shorted wiring between ECM and pump
  • Control driver fault in ECM (less common)

Fault status

⚠️ Status
Control circuit low for Charge Air Cooler Coolant Pump A — drive voltage below expected threshold or insufficient pump response; MIL set.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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Code

P023B

LAND ROVER P — Powertrain

Cargo Air Conditioning Refrigeration Pump Control - Circuit low

Brand: LAND ROVER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse for intercooler/coolant pump circuit
  • Faulty coolant pump (motor) or pump seized
  • Open or high-resistance wiring in pump power or ground circuits
  • Short to ground in the pump power feed
  • Corroded/loose connector at pump or relay
  • Faulty relay or control module driver (ECM/BCM)

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Intercooler/charge-air cooling reduced, higher intake-air temperatures
  • Reduced engine performance or turbo efficiency under load
  • Possible engine derate in some vehicles
  • Overheating of charge-air system components
  • No noise or movement from intercooler coolant pump when commanded

What to check

  • Read and record freeze-frame and any pending codes with a scan tool
  • Visually inspect pump, connectors, wiring harness, relay and fuse for damage or corrosion
  • Check fuse and relay operation for the pump circuit
  • Backprobe pump power and ground while commanding pump on with a scan tool; verify voltage and ground presence
  • Measure pump motor resistance and perform bench test by applying battery voltage (observe current draw and rotation)
  • Perform a wiggle test on wiring harness while monitoring operation to find intermittent faults

Signal parameters

  • Expected drive voltage when commanded: ≈ battery voltage (B+) or PWM up to B+ (typically >10 V when ON)
  • Expected pump current: typically in the 0.5–10 A range depending on pump design (verify factory spec)
  • PWM control duty: 0–100% depending on load and control strategy
  • Circuit continuity: low ohms between pump and ground/power when connector disconnected

Diagnostic algorithm

  1. Retrieve DTCs and freeze-frame data with a scan tool. Clear codes and attempt to re-run to confirm reproducible fault.
  2. Perform a visual inspection of pump, wiring, connectors, fuse, and relay. Repair obvious damage or corrosion.
  3. Check the fuse and relay for the intercooler coolant pump; replace if faulty.
  4. With ignition ON (engine off), backprobe the pump connector. Command the pump ON via scan tool and observe voltage on the power terminal and a good ground on the ground terminal.
  5. If no drive voltage at connector when commanded, check relay coil and control circuit between ECM and relay. Verify relay operation and supply voltage to relay.
  6. If drive voltage is present but pump does not run, disconnect pump and measure its resistance. Bench-test the pump with direct battery power (observe rotation and current draw). Replace pump if it does not operate or draws excessive current.
  7. If pump is not receiving correct voltage and relay and fuses are good, test wiring for open/short to ground/voltage and inspect ECM ground connections. Repair wiring or connectors as needed.
  8. If wiring and pump test good but ECM does not command or reads low signal, consider ECM driver fault and consult manufacturer procedures before replacing ECM.
  9. After repairs, clear codes and verify system operation on-road and with scan-tool commanded tests. Confirm no reoccurrence of the DTC.
  10. (Safety) Isolate battery when doing major wiring repairs and follow safe battery/disconnection procedures.

Likely causes

  • Blown fuse or failed relay to pump
  • Corroded/loose connector at the coolant pump
  • Failed pump motor (no rotation or high resistance)
  • Open/shorted wiring between ECM and pump
  • Control driver fault in ECM (less common)

Fault status

⚠️ Status
Control circuit low for Charge Air Cooler Coolant Pump A — drive voltage below expected threshold or insufficient pump response; MIL set.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P023A P0299 P0480 P0627 P0628
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

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