P023B low Severity

P023B: Charge Air Cooler Coolant Pump Control Circuit Low

May cause reduced engine performance, increased intake temperatures, and decreased fuel economy under load

Overview

P023B indicates a low voltage condition detected in the charge air cooler (intercooler) coolant pump control circuit, potentially due to electrical faults, pump failure, or wiring issues

Common Symptoms

  • Check Engine Light (CEL) illuminated
  • Reduced engine performance under boost
  • High intake air temperatures
  • Poor fuel economy

Most Common Causes

Faulty charge air cooler coolant pump medium

Pump may fail mechanically or electrically reducing coolant flow

Wiring or connector issues in the pump control circuit high

Broken, corroded, or shorted wiring/connectors common cause

Faulty pump relay or low system voltage medium

Low voltage due to weak battery or relay failure can trigger low circuit condition

ECM/PCM internal fault low

Rare; only after excluding wiring and component issues

Diagnostic Steps

  1. Verify P023B with a scan tool and record any related codes
    Expected: P023B present on scan tool
    Interpretation: Confirms current active fault
  2. Visually inspect charge air cooler coolant pump wiring and connectors
    Expected: No corrosion, loose connections, or damaged insulation
    Interpretation: If damage present, likely cause
  3. Test pump power and ground with a multimeter while commanded ON
    Expected: Appropriate voltage present at pump connector
    Interpretation: No voltage indicates wiring/relay/ECM issue
  4. Test/replace the coolant pump relay if equipped
    Expected: Relay functions and supplies voltage correctly
    Interpretation: Faulty relay may cause low circuit condition
  5. Directly power the pump to verify operation
    Expected: Pump runs and circulates coolant
    Interpretation: Pump failure if non-operational

Repair Solutions

Repair or replace damaged wiring/connectors medium
Estimated Cost: $50 - $300

Depends on extent of wiring harness repair needed

Replace the charge air cooler coolant pump medium
Estimated Cost: $200 - $800

Part and labor vary by make/model

Replace faulty pump relay easy
Estimated Cost: $20 - $100

Simple relay swap if applicable

Address low system voltage (battery/alternator) medium
Estimated Cost: $100 - $400

May include battery or alternator servicing

Common Misdiagnoses

Avoid these common diagnostic mistakes:

  • Assuming turbocharger boost sensor fault due to P02xx proximity without confirming electrical tests

Frequently Asked Questions

What does the P023B code mean?

The P023B code stands for Charge Air Cooler Coolant Pump Control Circuit Low. This generally indicates an issue with the Air Intake system.

Is it safe to drive with a P023B code?

You should treat P023B as a low issue. May cause reduced engine performance, increased intake temperatures, and decreased fuel economy under load

Symptoms associated with DTC P023B

You may experience the following: Check Engine Light (CEL) illuminated, Reduced engine performance under boost, High intake air temperatures.

What causes the P023B code?

This code is frequently triggered by: Faulty charge air cooler coolant pump, Wiring or connector issues in the pump control circuit, Faulty pump relay or low system voltage.

Repair cost breakdown for P023B

Repair costs depend on the specific failure. A simple Replace faulty pump relay replacement is relatively affordable ($20-$100), whereas a Replace the charge air cooler coolant pump repair is more expensive, potentially reaching $800.

Does code P023B apply to Nissan vehicles?

This is a universal code. You might see P023B on Ford, Chevrolet, Toyota, Honda, Nissan, or any other OBD-II vehicle.

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