P023A medium Severity

P023A: Charge Air Cooler Coolant Pump Control Circuit/Open

Check Engine Light illuminated; possible reduced performance under boost due to impaired intercooler cooling

Overview

P023A indicates an open or fault in the charge air cooler/intercooler coolant pump control circuit detected by the engine control module. Associated with turbocharged/intercooled engines that use a dedicated coolant pump.

Common Symptoms

  • Malfunction Indicator Lamp (Check Engine Light) illuminated
  • Reduced engine power or performance under load
  • Higher intake air temperatures
  • Possible engine overheating when under heavy boost

Most Common Causes

Open or broken wiring in the charge air cooler coolant pump control circuit high

Electrical interruption between PCM/ECM and the pump is frequently reported.

Faulty charge air cooler coolant pump medium

Pump motor may have failed internally or be obstructed.

Blown fuse or faulty relay supplying the coolant pump medium

Control relay failure is often d as a common failure point.

Corroded or poor connector terminals medium

Connections can corrode or loosen, causing open circuit conditions.

PCM/ECM fault low

Module faults are possible but rare compared to wiring/pump issues.

Diagnostic Steps

  1. Confirm the presence of P023A with a scan tool and check for additional related codes.
    Expected: Code P023A active; note any other codes.
    Interpretation: Verifies that the code is currently relevant and checks for related issues.
  2. Visually inspect the intercooler coolant pump wiring and connectors for damage or corrosion.
    Expected: No visible wire breaks, corrosion, or loose connectors.
    Interpretation: Good wiring suggests further electrical testing; visible damage directs repair.
  3. Test power and ground at the coolant pump connector with a multimeter.
    Expected: Proper voltage and ground present when pump is commanded on.
    Interpretation: If no voltage/ground, trace wiring back toward PCM; if present, pump may be faulty.
  4. Check related fuses and relays in the pump circuit.
    Expected: Fuses intact; relay functions correctly when tested.
    Interpretation: Blown fuse or faulty relay indicates replace before further diagnosis.
  5. Bench-test or directly power the coolant pump to confirm operation.
    Expected: Pump runs and circulates coolant when supplied power.
    Interpretation: Non-operational pump should be replaced; operational pump suggests wiring/PCM cause.

Repair Solutions

Repair or replace damaged wiring/connectors medium
Estimated Cost: $50 - $200

Cost varies with labor and extent of wiring damage.

Replace charge air cooler coolant pump medium
Estimated Cost: $150 - $500

Part cost and labor vary significantly by make/model.

Replace faulty fuse or relay easy
Estimated Cost: $10 - $100

Simple electrical replacement if components are accessible.

PCM/ECM reprogram or replacement hard
Estimated Cost: $500 - $1500

Only after eliminating all other causes.

Common Misdiagnoses

Avoid these common diagnostic mistakes:

  • Assuming turbocharger hardware fault instead of coolant pump electrical issue

Frequently Asked Questions

Can you explain the meaning of P023A?

Technically, the P023A code represents Charge Air Cooler Coolant Pump Control Circuit/Open. It usually points to a fault within the Air Intake.

Should I stop driving if I have P023A?

This is a medium priority issue. Check Engine Light illuminated; possible reduced performance under boost due to impaired intercooler cooling

What happens when the P023A code is active?

Common symptoms include: Malfunction Indicator Lamp (Check Engine Light) illuminated, Reduced engine power or performance under load, Higher intake air temperatures. You might also notice the Check Engine Light is on.

What parts fail when P023A is set?

Potential culprits include: Open or broken wiring in the charge air cooler coolant pump control circuit, Faulty charge air cooler coolant pump, Blown fuse or faulty relay supplying the coolant pump. A proper diagnosis is recommended.

Repair cost breakdown for P023A

Expect to pay around $100 if the issue is a Replace faulty fuse or relay, but up to $1500 if the PCM/ECM reprogram or replacement needs replacement.

Does P023A affect Ford, Toyota, or Honda?

The P023A code is a generic powertrain code, meaning it applies to almost all makes and models, such as Honda, Toyota, VW, Ford, and Chevy.

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