2024 Jeep Compass P0C74 MIL Illumination TSB

Owners of the 2024 Jeep Compass equipped with the 1.3L I4 Turbo PHEV engine may encounter a Malfunction Indicator Lamp (MIL) illumination on their dashboard. This warning light is typically accompanied by a specific diagnostic trouble code (DTC) indicating a performance issue within the vehicle's hybrid system. This article details the cause and solution for the Jeep Compass P0C74 fault.

Stellantis has released Technical Service Bulletin (TSB) 08-064-25, which outlines a software update procedure for the Hybrid Control Processor (HCP) and Auxiliary Hybrid Control Module (AHCP). This TSB, dated March 11, 2025, supersedes TSB 08-200-24 dated September 11, 2024, and is also released as Rapid Service Update (RSU) 24-127. The update aims to resolve the underlying software issue causing the MIL and the Jeep Compass P0C74 DTC.

Symptoms

If your 2024 Jeep Compass is affected, you will typically observe the following:

• Malfunction Indicator Lamp (MIL) illumination: The check engine light will be on.
• Diagnostic Trouble Code (DTC) P0C74: This specific code will be stored in the vehicle's computer system.

Fault Codes / DTCs

The primary diagnostic trouble code associated with this issue is:

Code	Description
P0C74	Motor Electronics Coolant Pump "B" Control Performance

Diagnosis and Trigger Conditions

Technicians should verify that a Malfunction Indicator Lamp (MIL) is illuminated and that the vehicle has set the DTC P0C74. Diagnosis involves using a scan tool like wiTECH to confirm the presence of the DTC and ensure all related systems are functioning correctly. If other DTCs or symptoms are present, they should be addressed before proceeding with this bulletin.

It is important to note that this Rapid Service Update (RSU) 24-127 primarily applies to vehicles listed on the RSU VIN list. However, if a vehicle not on the VIN list exhibits the MIL illumination and the Jeep Compass P0C74 DTC, the repair procedure should still be performed.

Important Warnings and Safety Precautions

Before performing any software reprogramming or repairs related to high-voltage systems, technicians must adhere to strict safety guidelines:

• Do not connect the vehicle to a high voltage charger when performing software updates.
• Install a battery charger to ensure sufficient battery voltage is provided throughout the flash process.
• If the flash process is interrupted or aborted, the flash should be restarted.
• Before performing software reprogramming, it is necessary to make the vehicle safe.
• When performing repairs that involve or imply contact with live high voltage components/systems, the technician must ensure that the power supply of the high-voltage system is disconnected throughout the operation.
• Only specifically trained technicians qualified to perform repairs on vehicles with high voltage systems under current national laws/regulations are authorized to work on the vehicle.
• Before performing any diagnostic repair work, technicians must carefully read and comply with the general instructions for working safely on hybrid/electric vehicles and use suitable general equipment and Personal Protective Equipment (PPE).

Repair Procedure Summary

The repair primarily involves updating the software for the Hybrid Control Processor (HCP) and Auxiliary Hybrid Control Module (AHCP), which are also known as the Power Inverter Module (PIM). The general steps are:

1. Verify VIN: Check if the vehicle's VIN is on the RSU VIN list. If not, but the symptom and DTC P0C74 are present, proceed with the repair.
2. Check PCM Software: Determine if the Powertrain Control Module (PCM) already has the latest software.
3. Reprogram AHCP: Update the Auxiliary Hybrid Control Module with the latest available software using the wiTECH Diagnostic Application.
4. Reprogram HCP: Update the Hybrid Control Processor with the latest available software using the wiTECH Diagnostic Application.
5. PROXI Alignment: Perform a "PROXI Alignment Procedure" using wiTECH, found under the 'Vehicle Preparations' tab.
6. Clear DTCs: Clear any diagnostic trouble codes that may have been set in any modules during the reprogramming process. The wiTECH application will automatically assist in clearing these codes.

Required Tools or Parts

• wiTECH or Equivalent: A diagnostic scan tool is necessary for verifying DTCs, performing software updates, and clearing codes.

Owner Action

If your 2024 Jeep Compass is exhibiting a Malfunction Indicator Lamp (MIL) illumination and you suspect the Jeep Compass P0C74 DTC, it is recommended to visit an authorized Stellantis dealer. The dealer will be able to verify the presence of the DTC and perform the necessary software updates to the Hybrid Control Module (HCP) and Auxiliary Hybrid Control Module (AHCP). All repairs related to this TSB are reimbursable within the provisions of your vehicle's warranty.

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Source: NHTSA ID: 11015632