2022 Jeep Wrangler PCM Updates for MIL and DTCs

Owners of 2022 Jeep Wrangler vehicles may experience various issues related to the Powertrain Control Module (PCM) software. This Technical Service Bulletin (TSB) 18-008-26 REV. A provides a solution by updating the PCM software to address these concerns, which can include warning lights and specific diagnostic trouble codes.

This bulletin, dated February 17, 2026, supersedes the previous TSB 18-008-26 issued on January 29, 2026. It specifically applies to 2022 Jeep Wrangler models equipped with the 3.6L V6 24V VVT Engine UPG I W/ESS (Sales Code ERC) and is applicable to North American markets. Addressing these issues with the latest Jeep Wrangler PCM updates helps ensure optimal vehicle performance and reliability.

Symptoms

Customers may notice one or more of the following symptoms indicating a need for the Jeep Wrangler PCM updates:

• Illumination of the Malfunction Indicator Lamp (MIL).
• The vehicle entering "limp home mode".
• For manual transmission vehicles, a "Service Transmission" message appearing in the Instrument Panel Cluster (IPC) due to clutch slip detection.
• Customers might experience wheel spin or slippage, which the PCM could misinterpret as excessive clutch slip, leading to the "Service Transmission" message in the IPC to prevent clutch damage.

Additionally, this software update includes enhancements to the engine oil pump operation, specifically engaging high-pressure mode with cold engine oil to improve valvetrain component reliability.

Fault Codes / DTCs

The Malfunction Indicator Lamp (MIL) illumination is often accompanied by specific Diagnostic Trouble Codes (DTCs) stored in the vehicle's system. These codes help technicians pinpoint the nature of the issue.

Code	Description	Module
P08A6	Gear Lever Position Sensor System – Multiple Sensor Correlation (Manual Transmission Only)	Powertrain Control Module (PCM)
P152F	Engine Hood Switch 2 / Engine Hood Switch 1 Correlation	Powertrain Control Module (PCM)

Diagnosis / Trigger Conditions

To diagnose these issues, technicians will use a Scan Tool, such as wiTECH, along with diagnostic procedures available in DealerCONNECT/Service Library. This allows them to verify proper system function and identify any DTCs or symptom conditions. If other issues are present, they must be addressed before proceeding with the PCM software update.

Important Warnings

During the reprogramming process, specific precautions must be taken to ensure a successful update and prevent damage to the vehicle's electrical system:

• 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 this flash process is interrupted/aborted, the flash should be restarted."

Repair Procedure Summary

The repair for these conditions involves reprogramming the Powertrain Control Module (PCM) with the latest available software. This is a critical step to implement the necessary Jeep Wrangler PCM updates and resolve the underlying software issues.

1. The technician will connect to the vehicle and reprogram the PCM using the wiTECH Diagnostic Application. If any issues arise during the flashing process, a ticket should be submitted to the Helpdesk.
2. After the reprogramming is complete, all Diagnostic Trouble Codes (DTCs) that may have been set in any module will be cleared using the wiTECH application.

Required Tools or Parts

• Scan Tool: wiTECH or Equivalent

Owner Action

If your 2022 Jeep Wrangler is exhibiting any of the symptoms described, such as a persistent Malfunction Indicator Lamp, a "Service Transmission" message, or the vehicle entering limp home mode, it is recommended to schedule an appointment with your authorized Jeep dealer. The dealer will perform the necessary diagnostic checks and apply the PCM software update (TSB 18-008-26 REV. A).

This repair is reimbursable within the provisions of the warranty. The labor operation number for this procedure is 18-19-06-BD, with an estimated labor time of 0.3 hours.

Source: NHTSA ID 11029676