2022 Jeep Wrangler PCM Update for MIL and DTCs

Owners of 2022 Jeep Wrangler vehicles may experience various issues related to the Powertrain Control Module (PCM). Technical Service Bulletin (TSB) 18-008-26, issued on January 29, 2026, details a software update for the PCM to address these concerns. This bulletin specifically applies to 2022 Jeep Wrangler models equipped with the 3.6L V6 VVT Engine Upgrade 1 (Sales Code ERC) and is applicable to North American markets. This 2022 Jeep Wrangler PCM update aims to improve vehicle performance and reliability.

Symptoms

Customers might notice several symptoms indicating a need for this 2022 Jeep Wrangler PCM update. The primary indicator is the illumination of the Malfunction Indicator Lamp (MIL) on the dashboard. Along with the MIL, specific Diagnostic Trouble Codes (DTCs) may be stored in the vehicle's system.

Other reported symptoms include a "Service Transmission" message appearing in the Instrument Panel Cluster (IPC), particularly in manual transmission vehicles, due to clutch slip detection. It's important to note that the PCM might misinterpret wheel spin or slippage as excessive clutch slip, leading to this message and a potential risk of clutch damage. Additionally, the vehicle may enter "limp home mode," which restricts engine power to prevent further damage.

Fault Codes / DTCs

This TSB specifically identifies two Diagnostic Trouble Codes (DTCs) that indicate the need for a PCM software update:

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

Diagnosis

To diagnose these issues, technicians will use a Scan Tool, such as wiTECH or an equivalent system, along with the appropriate Diagnostic Procedures available in DealerCONNECT/Service Library. This process helps verify that all related systems are functioning correctly. If any DTCs or symptom conditions other than those listed in TSB 18-008-26 are present, they must be recorded and addressed before proceeding with the PCM reprogramming. If the customer's reported symptoms match those described in the bulletin, the repair procedure should be initiated.

Repair Procedure Summary

The repair for these issues involves reprogramming the Powertrain Control Module (PCM) with the latest available software. This is a critical software update that should be performed by a qualified technician.

Before starting the flash process, it is crucial to install a battery charger to ensure the battery voltage remains between 13.2 and 13.5 volts. This stable power supply prevents interruptions during the reprogramming. If the flash process is interrupted or aborted for any reason, it must be restarted from the beginning. Once the PCM has been successfully reprogrammed using the wiTECH Diagnostic Application, all Diagnostic Trouble Codes (DTCs) that may have been set in any module due to the reprogramming process will be automatically presented by the wiTECH application and should be cleared.

Required Tools

Performing this PCM software update requires a specialized diagnostic tool:

• wiTECH or Equivalent: This scan tool is necessary for accessing the vehicle's systems and performing the PCM reprogramming.

Other Software Enhancements

In addition to addressing the primary symptoms and DTCs, this PCM software update includes other enhancements. Notably, it optimizes the engine oil pump to operate in a high-pressure mode when the engine oil is cold. This improvement is designed to enhance valvetrain component reliability and overall engine health.

Owner Action

If your 2022 Jeep Wrangler exhibits any of the symptoms described, such as MIL illumination, the "Service Transmission" message, or enters limp home mode, it is recommended to visit an authorized Jeep dealership. The repair, which involves updating the PCM software, is reimbursable under the provisions of the vehicle's warranty. The labor operation for this service is 18-19-06-8A, with a labor time of 0.3 hours, and the failure code for claims is CC.

Important Warnings

• Battery Voltage: During the PCM flash process, it is critical to install a battery charger and ensure the battery voltage does not drop below 13.2 volts or climb above 13.5 volts. Maintaining this specific voltage range is essential for a successful update.
• Interrupted Flash: If the PCM flash process is interrupted or aborted for any reason, the entire flash procedure must be restarted to prevent potential module damage or incomplete programming.

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Source: NHTSA ID: 11028235