2022 Jeep Wrangler Engine Knocking PCM Update TSB 18-027-25

Owners of certain 2022 Jeep Wrangler vehicles may notice their engine exhibiting a "knocking" or "pinging" sound under specific conditions. This issue, detailed in Technical Service Bulletin (TSB) 18-027-25, points to the Powertrain Control Module (PCM) software as the root cause.

This TSB specifically applies to 2022 Jeep Wrangler models equipped with the 6.4L V8 SRT HEMI MDS Engine (Sales Code ESG) and the 8-Speed Automatic 8HP75 Transmission (Sales Code DFV).

Symptoms

Customers may experience the following symptom:

• "Engine knocking or "pinging" during extreme hot and dry ambient temperatures if only using 91 Octane fuel."

If you notice your 2022 Jeep Wrangler engine knocking under these circumstances, a PCM software update may be necessary.

Diagnosis and Trigger Conditions

To diagnose this condition, technicians will use a Scan Tool (wiTECH) to verify all related systems are functioning correctly. If your 2022 Jeep Wrangler is experiencing the described "engine knocking or "pinging" symptom, the repair procedure outlined in TSB 18-027-25 should be followed.

For warranty claims related to this issue, the failure code "CC" (Customer Concern) must be used. This indicates that the customer's reported symptom matches the conditions described in the Technical Service Bulletin.

Repair Procedure Summary

The repair for the 2022 Jeep Wrangler engine knocking issue involves reprogramming the Powertrain Control Module (PCM) with the latest available software. This is a software-only update.

Before beginning the flash process, a battery charger must be installed to ensure the battery voltage remains between 13.2 and 13.5 volts. This is crucial to prevent interruptions during the software update. If the flash process is interrupted for any reason, it must be restarted.

After the PCM has been reprogrammed, any Diagnostic Trouble Codes (DTCs) that may have been set in any module due to the reprogramming process will be cleared using the wiTECH application. The entire process is estimated to take approximately 0.3 hours of labor.

Required Tools or Parts

The primary tool required for this repair is a wiTECH diagnostic tool or an equivalent system capable of performing PCM reprogramming.

Important Warnings

• Battery Voltage: Install a battery charger to ensure battery voltage does not drop below 13.2 volts. Do not allow the charging voltage to climb above 13.5 volts during the flash process.
• Interrupted Flash: If the flash process is interrupted or aborted, the flash should be restarted.
• Market-Specific Note: For the SA market only, after applying this TSB, it is not necessary to send DID-I or DID-A.

Owner Action

If your 2022 Jeep Wrangler is experiencing the described engine knocking or pinging, especially in hot, dry conditions when using 91 Octane fuel, you should contact your authorized Jeep dealer. Inform them of the symptoms you are experiencing and mention Technical Service Bulletin (TSB) 18-027-25. The repair, which involves a PCM software update, is reimbursable under the provisions of the vehicle's warranty.

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Source: NHTSA ID: 11019435