P023B Code - Charge Air Cooler Coolant Pump Control Circuit Low
Quick Answer
The Charge Air Cooler (CAC) system is used to reduce the temperature of the air entering the combustion chambers to improve engine performance. Common causes include Faulty Charge Air Cooler Coolant Pump, Charge Air Cooler Coolant Pump harness is open or shorted, Charge Air Cooler Coolant Pump circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P023B indicates Charge Air Cooler Coolant Pump Control Circuit Low.
- Common causes
- Common causes include Faulty Charge Air Cooler Coolant Pump, Charge Air Cooler Coolant Pump harness is open or shorted, Charge Air Cooler Coolant Pump circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P023B Description
The CAC Pump is a smart device that contains a LIN Bus communication module and a coolant pump. To maintain a desired charge air temperature, the Powertrain Control Module (PCM) sends a pump speed command over the LIN bus to the internal CAC pump module. The internal CAC Pump module controls the pump speed/coolant flow rate using Pulse-width modulation (PWM). The CAC Pump assembly monitors for internal system circuits and performance failures. If a fault occurs the CAC Pump module sends the fault information to the PCM through the dedicated LIN Bus. The PCM processes the information received and then sets the correlating fault.
The Diagnostic Trouble Code (DTC) will be set if the PCM receives a LIN bus message from the Charge Air Cooler Coolant Pump that the pump control circuit voltage is less than 8.5-Volts.
What are the Possible Causes of the DTC P023B?
- Faulty Charge Air Cooler Coolant Pump
- Charge Air Cooler Coolant Pump harness is open or shorted
- Charge Air Cooler Coolant Pump circuit poor electrical connection
- Faulty Powertrain Control Module (PCM)
How to Fix the DTC P023B?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P023B code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P023B code?
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Information for Specific Makes
- P023B Audi — Charge Air Cooler Coolant Pump Control Circuit Low
- P023B Chevrolet — Charge Air Cooler Coolant Pump Relay Control Circuit Low
- P023B Chrysler — Charge Air Cooler Coolant Pump Control Circuit Low
- P023B Dodge — Charge Air Cooler Coolant Pump Control Circuit Low
- P023B Infiniti — Charge Air Cooler Coolant Pump Control Circuit Low
- P023B Jeep — Charge Air Cooler Coolant Pump Control Circuit Low
- P023B Nissan — Charge Air Cooler Coolant Pump Control Circuit Low
- P023B RAM — Charge Air Cooler Coolant Pump Control Circuit Low
- P023B Volkswagen — Charge Air Cooler Coolant Pump Control Circuit Low
Frequently Asked Questions about P023B Code
1. What does the OBDII code P023B mean?
P023B indicates a low voltage or malfunction in the control circuit of the charge air cooler coolant pump, which helps cool the air entering the engine.
2. What are the common symptoms of code P023B?
Symptoms may include reduced engine performance, increased intake air temperatures, illuminated check engine light, and possible overheating under heavy loads.
3. What causes the P023B code to appear?
Common causes include a faulty charge air cooler coolant pump, damaged wiring or connectors in the control circuit, or a malfunctioning control module.
4. Can I drive my car with the P023B code active?
Driving with this code is not recommended, as it can lead to reduced engine efficiency, overheating, and potential damage to the engine.
5. How do I diagnose the P023B code?
Diagnosis involves checking the coolant pump’s electrical connections, testing the pump for proper operation, and using a multimeter to measure voltage and continuity in the circuit.
6. How can I fix the P023B code?
Repairs may include replacing a faulty charge air cooler coolant pump, repairing damaged wiring, or replacing a defective control module.
7. Is the P023B code a serious issue?
Yes, if left unaddressed, it can lead to increased engine temperatures and potential long-term damage.
8. What tools are needed to troubleshoot the P023B code?
You’ll need an OBDII scanner, a multimeter, and possibly a wiring diagram for your vehicle to trace the circuit.
9. How much does it cost to repair the P023B code?
Repair costs vary depending on the specific issue, but replacing the coolant pump can cost between $200 and $600, plus labor.
10. Can a software update fix the P023B code?
In rare cases, a software update for the engine control module (ECM) may resolve the issue, but this typically requires diagnosis at a dealership.
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