2023 Jeep Compass MIL, Stop Start, ETC Lamp Flashes TSB

Owners of the 2023 Jeep Compass may experience several dashboard warnings and system malfunctions. These can include the "Malfunction Indicator Lamp (MIL) on," the "Stop Start Inoperative" message, and the "Electronic Throttle Control (ETC) Lamp Flashes." These issues are often linked to Diagnostic Trouble Code (DTC) P0652 Sensor Reference Voltage Low in your 2023 Jeep Compass.

This manufacturer communication, identified as Case Number S2408000113, released in October 2024, addresses these specific concerns for the 2023 Jeep Compass model. It provides guidance for technicians to diagnose and resolve the underlying electrical issue.

Symptoms

Drivers may notice one or more of the following symptoms in their 2023 Jeep Compass:

• "Malfunction Indicator Lamp (MIL) on": The check engine light illuminates on the dashboard.
• "Stop Start Inoperative": The vehicle's automatic engine stop-start feature fails to function.
• "Electronic Throttle Control (ETC) Lamp Flashes": The ETC warning light flashes, indicating a potential problem with the electronic throttle system.

Fault Codes / DTCs

Technicians investigating these symptoms may find various codes stored in the Powertrain Control Module (PCM). A key Diagnostic Trouble Code (DTC) associated with these issues is:

Code	Description	Module
P0652	Sensor Reference Voltage Low	PCM

Diagnosis / Trigger Conditions

The Powertrain Control Module (PCM) in the 2023 Jeep Compass contains two internal 5-Volt Sensor Supply sources, designated as Reference Voltage 1 and Reference Voltage 2. These sources are crucial for providing a stable 5.0-volt reference to multiple three-wire sensors throughout the vehicle's system. For self-protection, if the 5-Volt Supply circuit experiences a short to ground, or if one of the connected sensors is internally shorted, the PCM will temporarily deactivate that specific 5-Volt Supply circuit. The supply will remain off until the next ignition cycle, at which point it attempts to reactivate.

Repair Procedure Summary

The resolution for the 2023 Jeep Compass P0652 issue typically involves inspecting and, if necessary, repairing the vehicle's wiring harness. Technicians should focus their inspection on the harness routing located near the PCM bracket's lower mounting stud. The process involves carefully examining this area for any signs of contact, chafing, or damage that could lead to a short circuit. Once any issues are identified, the harness should be repaired and properly isolated to prevent future contact. A visual aid in the original document, titled "General location of harness contact," helps technicians pinpoint the affected area. Importantly, this repair typically requires "no parts required," meaning the fix is often a matter of adjusting or repairing existing wiring rather than replacing components.

Important Warnings

This communication from Stellantis US LLC includes a significant disclaimer for technicians and owners:

"This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Online does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the appropriate course of action."

This statement indicates that while the bulletin provides valuable diagnostic information based on past cases, it does not automatically qualify the repair for warranty coverage and emphasizes the technician's role in final diagnosis.

Owner Action

If your 2023 Jeep Compass is displaying a "Malfunction Indicator Lamp (MIL) on," is "Stop Start Inoperative," or has "Electronic Throttle Control (ETC) Lamp Flashes," especially if accompanied by Diagnostic Trouble Code (DTC) P0652, it is recommended to have your vehicle inspected by a qualified service technician. They can perform the necessary diagnostic checks and inspect the wiring harness near the PCM bracket to address the issue as outlined in TSB S2408000113.

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Source: NHTSA ID 11008886