2022-2023 Jeep Wrangler Performance Limited Fuel System TSB

Owners of 2022-2023 Jeep Wrangler vehicles equipped with the 2.0L I4 DOHC DI Turbo engine (Sales Codes EC1 and ECX) may encounter a dashboard message indicating "Performance Limited Fuel System." This warning can appear without any associated Diagnostic Trouble Codes (DTCs) being stored in the vehicle's computer. This specific problem is detailed in Technical Service Bulletin (TSB) 08-106-24 REV. C, which supersedes the previous TSB 08-106-24 REV. B issued on May 01, 2024.

This TSB, also released as Rapid Service Update (RSU) 24-075, dated April 18, 2024, identifies the root cause as a cooling system hose clamp making contact with the N17 circuit of the High Pressure Fuel Pump Solenoid harness. Such contact can lead to chafing or damage to the harness, resulting in the "Performance Limited Fuel System" warning.

Symptoms

The primary symptom customers may experience is the vehicle displaying the message: "Performance Limited Fuel System" on the instrument cluster. Importantly, this warning appears with no Diagnostic Trouble Codes (DTCs) present, which can make diagnosis challenging without specific guidance.

Diagnosis and Trigger Conditions

For vehicles exhibiting the "Performance Limited Fuel System" symptom, technicians are instructed to verify if the customer's VIN is listed in the VIP system or on the RSU VIN list for RSU 24-075. If the VIN is listed, the repair procedure outlined in TSB 08-106-24 REV. C should be followed directly. If the VIN is not on the RSU list but the vehicle presents the symptom, the repair procedure should still be performed.

The diagnostic process specifically involves inspecting the N17 circuit of the High Pressure Fuel Pump Solenoid harness for any signs of contact with a cooling system hose clamp. This contact point is critical to identifying the issue.

Repair Procedure Summary

The repair procedure for the Jeep Wrangler Performance Limited Fuel System issue involves several steps:

1. Harness Inspection: The technician will first inspect the N17 circuit harness for any contact with a cooling system hose clamp. Figure 1 in the TSB illustrates the typical location of this contact.
2. Clamp Rotation: If contact is found, the hose clamp will be rotated to ensure it no longer touches the harness. This prevents future chafing.
3. Damage Assessment: After clearing the contact, the harness is carefully inspected for any signs of damage, such as chafing or wear.
4. Wiring Repair: If the harness is found to be damaged, a specific repair procedure for the wiring will be performed. This involves referring to detailed service procedures found in DealerCONNECT under "29 - Non-DTC Diagnostics / Circuit Testing Procedures / Standard Procedure/ Wire Splicing."

Depending on the extent of the repair, different Labor Operation Numbers (LOPs) are used for warranty claims:

• 08-19-AT-99: For inspecting the harness for contact and damage (0.2 hours).
• 08-19-AT-CC: For inspecting the harness, finding no damage, and rotating the clamp (0.4 hours).
• 08-19-AT-DD: For inspecting the harness, finding damage, rotating the clamp, and repairing the wiring (1.0 hours).

Important Warnings

It is crucial for owners and technicians to note that this Rapid Service Update (RSU) 24-075 only applies to vehicles on the RSU VIN list. While vehicles not on the VIN list but exhibiting the symptom should still be diagnosed and repaired, the RSU-specific reimbursement provisions may vary.

Owner Action

If your 2022-2023 Jeep Wrangler displays the "Performance Limited Fuel System" message, especially without any accompanying DTCs, you should schedule an appointment with your authorized Jeep dealer. The dealer will be able to perform the inspection and necessary repairs as outlined in TSB 08-106-24 REV. C. All applicable repairs are reimbursable within the provisions of your vehicle's warranty.

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Source: NHTSA ID: 11001255