2021-2025 Jeep Wrangler No Start, CEL Illuminated TSB

Owners of 2021-2025 Jeep Wrangler vehicles may encounter various electrical and starting issues, including a complete "No Start" condition, the "Stop Start Inoperative" message, or a persistent "Battery or Check Engine Light (CEL) Illuminated". These symptoms, particularly a Jeep Wrangler no start situation, are addressed by FCA STAR Online Publication S2008000103 REV B, released in April 2025.

This communication highlights that these problems are often linked to specific diagnostic trouble codes (DTCs) and can be resolved by addressing connections within the vehicle's electrical system.

Symptoms You Might Experience

If your 2021-2025 Jeep Wrangler is affected, you might observe one or more of the following conditions:

• "No Start": The vehicle fails to start when the ignition is engaged.
• "Stop Start Inoperative": The engine stop-start system is not functioning as intended.
• "Battery or Check Engine Light (CEL) Illuminated": Warning lights appear on the instrument cluster, indicating an electrical or engine management fault.

These symptoms, especially a Jeep Wrangler no start, point towards an underlying electrical issue that requires attention.

Fault Codes (DTCs)

Technicians observing these symptoms may find one or more of the following Diagnostic Trouble Codes (DTCs) stored in the vehicle's system:

• P2Af5
• P2504
• P063A
• P2503
• P0562

These codes indicate potential problems within the power supply and control systems of the vehicle.

Diagnosis and Trigger Conditions

The root cause of these issues, including a Jeep Wrangler no start scenario, is often related to the High Current Fuse Array (HCFA) and Power Control Relay (PCR) connections. These components are critical for distributing power throughout the vehicle's electrical system. Poor connections, such as looseness or corrosion, can disrupt power flow, leading to the reported symptoms and triggering the associated DTCs.

Repair Procedure Summary

The recommended repair procedure outlined in FCA STAR Online Publication S2008000103 REV B focuses on ensuring robust electrical connections at the High Current Fuse Array (HCFA) and Power Control Relay (PCR) locations. These components are typically found on the passenger side, often in the header area, as illustrated in the original document's figures.

Technicians are instructed to:

1. Inspect all connections at both the High Current Fuse Array (HCFA) and Power Control Relay (PCR) locations. This involves a thorough visual check for any signs of looseness, damage, or corrosion.
2. Clean and secure all HCFA and PCR connections. Any corrosion should be carefully removed, and all terminals and connectors must be securely fastened to ensure optimal electrical contact.
3. Test the HCFA as needed. After securing the connections, the High Current Fuse Array may require testing to confirm its proper functionality and ensure the issue is resolved.

Important Disclaimers

It is crucial for owners and technicians to understand the nature of this communication. FCA STAR Online Publication S2008000103 REV B explicitly states:

• "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 means that while the bulletin provides guidance based on observed patterns, it does not guarantee a warranty repair and emphasizes the technician's role in final diagnosis and repair decisions.

What Owners Should Do

If your 2021-2025 Jeep Wrangler is exhibiting a "No Start" condition, "Stop Start Inoperative" message, or the "Battery or Check Engine Light (CEL) Illuminated", especially if accompanied by the mentioned DTCs, it is recommended to schedule an appointment with an authorized Jeep service center. Inform them about the specific symptoms and mention FCA STAR Online Publication S2008000103 REV B. The service center can perform the necessary inspection and repair to address the High Current Fuse Array (HCFA) and Power Control Relay (PCR) connections.

Source: NHTSA ID: 11017401