2024 Jeep Compass MIL P0C74 Software Update

Owners of certain 2024 Jeep Compass vehicles equipped with the 1.3L I4 Turbo PHEV engine may encounter a Malfunction Indicator Lamp (MIL) illumination on their dashboard. This warning is typically accompanied by a specific diagnostic trouble code, P0C74, indicating a performance issue with the motor electronics coolant pump.

This condition is addressed by Technical Service Bulletin (TSB) 08-200-24, which outlines a software update for the Hybrid Control Module (HCP) and Auxiliary Hybrid Control Module (AHCP). This bulletin has also been released as Rapid Service Update (RSU) 24-127.

Symptoms

The primary symptom indicating this issue is the illumination of the Malfunction Indicator Lamp (MIL) on the instrument cluster. This warning light signals that the vehicle's onboard diagnostic system has detected a fault.

Fault Codes / DTCs

When the Malfunction Indicator Lamp (MIL) illumination occurs, a scan tool will typically retrieve the following Diagnostic Trouble Code:

• P0C74 - Motor Electronics Coolant Pump "B" Control Performance

This 2024 Jeep Compass MIL P0C74 fault points to an issue with the performance of the motor electronics coolant pump, which is critical for managing the temperature of hybrid system components.

Diagnosis and Trigger Conditions

Technicians will use a scan tool, such as wiTECH, to verify the presence of the P0C74 DTC. The root cause of this 2024 Jeep Compass MIL P0C74 condition is identified as an internal software anomaly within the vehicle's control modules. The issue manifests when the module software incorrectly interprets the performance of the coolant pump, triggering the MIL.

Repair Procedure Summary

The resolution for the 2024 Jeep Compass MIL P0C74 issue involves updating the software for the Hybrid Control Module (HCP) and Auxiliary Hybrid Control Module (AHCP). These modules are also collectively known as the Power Inverter Module (PIM).

1. Vehicle Preparation: The technician first verifies if the vehicle's VIN is part of the RSU list. If not, but the symptoms are present, the repair proceeds under the TSB. They ensure the vehicle is safe for high-voltage work and connect a battery charger to maintain stable voltage during the reprogramming process.
2. Software Reprogramming: Using the wiTECH diagnostic application, the technician will reprogram both the AHCP and HCP with the latest available software. If any issues arise during this process, such as an interruption, the flash must be restarted.
3. Post-Reprogramming Steps: After successful reprogramming, a "PROXI Alignment Procedure" is performed using wiTECH. Finally, any Diagnostic Trouble Codes (DTCs) that may have been set during the reprogramming process are cleared.

Required Tools or Parts

The primary tool required for this service procedure is a wiTECH diagnostic system or an equivalent tool capable of performing module reprogramming and diagnostics for Stellantis vehicles. A suitable battery charger is also essential to ensure stable voltage throughout the software update.

Important Warnings

Several critical safety warnings are highlighted in TSB 08-200-24 regarding this repair:

• "The vehicle must not be connected to a high voltage charger when performing software updates."
• "Install a battery charger to ensure sufficient battery voltage is provided during the flash process."
• "If this flash process is interrupted/aborted, the flash should be restarted."
• "Before performing the software reprogramming, it is necessary to make the vehicle safe."
• "When performing repairs that directly involve or imply possible 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 on the vehicle, 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)."

What Owners Should Know

This service action, identified as TSB 08-200-24 and RSU 24-127, is reimbursable within the provisions of your vehicle's warranty. While a Rapid Service Update (RSU) is typically VIN-specific, the Technical Service Bulletin provides a repair procedure for any vehicle exhibiting the Malfunction Indicator Lamp (MIL) illumination and the P0C74 DTC, even if it's not on the RSU VIN list. It's crucial to have this repair performed by a qualified technician due to the involvement of high-voltage hybrid components.

Owners should contact their authorized Jeep dealer to schedule an appointment. The dealer can verify if your vehicle is covered by RSU 24-127 or if the TSB procedure applies based on your vehicle's symptoms.

NHTSA ID: 11007842