P023A — Charge Air Cooler Coolant Pump Control Circuit/Open #

Note: The code description may differ depending on the vehicle manufacturer.

• Charge Air Cooler Coolant Pump Control Circuit/Open (Generic, Ford, GM, Chrysler)
• Intercooler Coolant Pump Control Circuit/Open (Mercedes-Benz, BMW)
• Aftercooler Coolant Pump Control Circuit/Open (Honda/Acura, Toyota/Lexus)

Summary of code P023A #

P023A is a diagnostic trouble code (DTC) that signals an issue in the charge air cooler coolant pump control circuit. The charge air cooler, often called an intercooler, reduces the temperature of air compressed by the turbocharger before it enters your engine. Many modern turbocharged engines use a liquid-cooled system with a dedicated electric coolant pump. This code means the Powertrain Control Module (PCM) or Engine Control Module (ECM) detects an open circuit—in other words, an electrical interruption—in the control wiring between itself and the pump. If left untreated, this issue can compromise engine performance and longevity, especially under boost.

Common symptoms for code P023A #

When P023A appears, your vehicle may exhibit certain warning signs. These symptoms can range from subtle to unmistakable, depending on how the charge air cooling system is affected. If you notice any of these, it’s your vehicle’s way of raising a red flag:

• Illuminated Check Engine Light (CEL)
• Reduced engine power, especially under hard acceleration
• Turbo lag or loss of boost pressure
• Higher than normal intake air temperatures (IAT)
• Potential engine overheating in severe cases
• Poor fuel efficiency
• Unusual noises from the engine bay (e.g. coolant pump not running)

Probable causes for P023A (by frequency) #

The root of a P023A code is nearly always electrical, but the specifics can vary. Based on field experience and OEM technical bulletins, here are the most common culprits:

1. Faulty charge air cooler coolant pump (open internal circuit or failed motor)
2. Damaged or corroded wiring/connectors between the PCM/ECM and the coolant pump
3. Blown fuse or relay in the pump circuit
4. PCM/ECM malfunction (rare, but possible)
5. Aftermarket modifications interfering with OEM wiring

Step-by-step diagnostic for code P023A #

Diagnosing P023A requires a logical and methodical approach. You’ll need a good scan tool, a digital multimeter, and a wiring diagram specific to your vehicle. Here’s how a master technician would approach this code:

• Step 1: Confirm the P023A code is active. Check for other related codes (P023B, P023C) that might help narrow diagnosis.
• Step 2: Visually inspect the charge air cooler coolant pump, associated wiring, and connectors for signs of corrosion, damage, or unplugging.
• Step 3: Verify power and ground at the coolant pump using a multimeter. Check for voltage at the pump connector with the engine running.
• Step 4: Inspect the relevant fuses and relays. Replace any that are blown or show signs of overheating.
• Step 5: Use the scan tool to command the pump on/off (if supported). Listen/feel for pump operation.
• Step 6: Check continuity of control and power wires from the PCM/ECM to the pump. Repair any open or high-resistance circuits.
• Step 7: If all wiring and fuses are good, bench-test or replace the pump itself. If the pump is functional, suspect a PCM/ECM fault.

Possible repairs for code P023A #

The correct repair depends on pinpointing the fault. Once you know the cause, here’s how you can address P023A:

• Replace a failed charge air cooler coolant pump
• Repair or replace damaged/corroded wiring or connectors in the pump circuit
• Replace a blown fuse or faulty relay controlling the pump
• Clean and secure all related electrical contacts
• In rare cases, repair or replace the PCM/ECM after all other avenues are exhausted
• Remove or rewire any problematic aftermarket modifications

Is it safe to drive with code P023A? #

Limited. While your vehicle may remain driveable with P023A, it’s not advisable for extended operation. Without a working charge air cooler coolant pump, intake air temperatures can rise rapidly during boost, leading to engine knock, power loss, and in worst cases, engine damage. If the code is present, avoid spirited driving and heavy loads. Get the issue addressed as soon as possible.

Vehicles most commonly affected by P023A #

P023A is most often seen on modern turbocharged vehicles that utilize a liquid-cooled charge air cooler system. Some vehicle makes and models where this code is more frequently reported include:

• Ford F-150 EcoBoost (2011+)
• Ford Explorer Sport/Platinum (EcoBoost)
• Chevrolet Silverado/GMC Sierra 1500 2.7L Turbo
• BMW 3 Series/5 Series (turbocharged engines, 2013+)
• Mercedes-Benz C-Class, E-Class (turbocharged models)
• Honda Civic Type R (FK8)
• Hyundai Veloster N, Genesis G70 2.0T

Common mistakes & best practices for P023A #

It’s easy to overlook the basics or misinterpret this code. Here are common pitfalls and tips for a smooth repair process:

• Skipping a visual inspection—damaged connectors or chafed wires can be missed if you jump straight to parts replacement.
• Replacing the pump without checking fuses or relays.
• Ignoring related codes that could provide useful clues (such as P023B).
• Overlooking aftermarket modifications that may interfere with the pump circuit.
• Not verifying repair—always clear codes and confirm the pump operates correctly before returning the vehicle to service.

Quick FAQ about code P023A #

Here are answers to the most common questions drivers and technicians have about this code:

• Q: Can a dirty coolant cause P023A?
  A: No, P023A is strictly an electrical circuit issue. While dirty or low coolant can affect system cooling, it won’t trigger this code.
• Q: Will replacing the pump always fix the code?
  A: Not always! The issue could be in the wiring, fuse, relay, or PCM/ECM. Always diagnose before replacing components.
• Q: How urgent is it to fix P023A?
  A: It’s advisable to address it soon, as prolonged driving under boost can cause engine damage from excessive intake temperatures.