AutoCodes – RAM – P023B RAM

P023B RAM 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 RAM 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.

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Code Popularity 264

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 02, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P023B RAM Description

The Charge Air Cooler (CAC) system is used to reduce the temperature of the air entering the combustion chambers to improve engine performance. The Supercharger causes the temperature increase of the air entering the engine. The CAC system consists of an electric CAC Coolant Pump, Charge Air Coolers, Coolant Reservoir, Charge Air Cooler Radiator, Charge Air Cooler Coolant Temperature Sensor, and plumbing. The CAC cooling system operates independently of the vehicle’s primary cooling system.
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.

OBDII Code P023B RAM - Charge Air Cooler Coolant Pump Control Circuit Low - AutoCodes.com — P023B RAM Code - Charge Air Cooler Coolant Pump Control Circuit Low

What does this mean?

What are the Possible Causes of the DTC P023B RAM?

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 RAM?

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 RAM 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.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.