2022 Jeep Wrangler Misfire TSB 18-047-26

Owners of 2022 Jeep Wrangler vehicles equipped with the 3.6L V6 24V VVT ETORQUE Engine (Sales Code ERG) may experience engine performance issues. These can include engine misfires, a rough idle, or a noisy valvetrain. These symptoms are often accompanied by the illumination of the Malfunction Indicator Lamp (MIL) on the dashboard.

This issue is specifically addressed by Technical Service Bulletin (TSB) 18-047-26, which outlines a procedure to update the Powertrain Control Module (PCM) software. This software update is designed to resolve the underlying cause of these engine performance problems in the affected 2022 Jeep Wrangler models, particularly the 2022 Jeep Wrangler misfire condition.

Symptoms

Customers may experience a "Malfunction Indicator Lamp (MIL) illumination" and/or one or more of the following engine performance issues:

• The vehicle has a rough idle.
• The engine has a miss.
• Noisy valvetrain.

Fault Codes / DTCs

These symptoms are typically accompanied by the vehicle setting one or more of the following Diagnostic Trouble Codes (DTCs):

| Code | Description | |:-------|:-------------------------------------------------------------------|: | P0300 | Multiple Cylinder Misfire (Active or Stored status set during cold start catalyst heating) | | P0301 | Cylinder 1 Misfire (Active or Stored status set during cold start catalyst heating) | | P0302 | Cylinder 2 Misfire (Active or Stored status set during cold start catalyst heating) | | P0303 | Cylinder 3 Misfire (Active or Stored status set during cold start catalyst heating) | | P0304 | Cylinder 4 Misfire (Active or Stored status set during cold start catalyst heating) | | P0305-00 | Cylinder 5 Misfire (Active or Stored status set during cold start catalyst heating) | | P0306-00 | Cylinder 6 Misfire (Active or Stored status set during cold start catalyst heating) |

Diagnosis

To diagnose the issue, technicians should use a Scan Tool (wiTECH) with the appropriate Diagnostic Procedures available in DealerCONNECT/Service Library. It's important to verify that all related systems are functioning as designed. If any DTCs or symptom conditions other than those listed in this bulletin are present, they should be recorded and repaired as necessary before proceeding with the TSB 18-047-26 repair procedure.

Required Tools

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

Important Warnings

During the PCM reprogramming process, specific precautions must be taken:

• Install a battery charger to ensure the 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.
• If the flash process is interrupted or aborted for any reason, the flash should be restarted.

Repair Procedure Summary

The repair for the 2022 Jeep Wrangler misfire and related symptoms involves updating the Powertrain Control Module (PCM) software. The steps are as follows:

1. Prepare the Vehicle: Connect a battery charger to the vehicle and ensure the battery voltage remains between 13.2 and 13.5 volts throughout the process.
2. Reprogram PCM: Using the wiTECH Diagnostic Application, reprogram the PCM with the latest available software. If any issues arise during the flashing process, a ticket should be submitted to the Helpdesk.
3. Clear DTCs: After the flash, the wiTECH application will automatically present all DTCs that may have been set in any module due to the reprogramming. These DTCs should then be cleared.

Warranty Information

This repair is reimbursable under warranty provisions. The specific claims data for this operation is:

• Labor Operation No.: 18-19-06-N1
• Labor Description: Module, Powertrain Control (PCM) - Reprogram (0 - Introduction)
• Skill Category: 1 - Engine Repair and Performance
• Labor Time: 0.3 Hours
• Failure Code: CC (Customer Concern)

For the SA market only, after applying this TSB, it is not necessary to send DID-I or DID-A.

NHTSA ID: 10249673