2024 Jeep Wrangler MIL & DTCs TSB 18-011-25

Symptoms

Owners of a 2024 Jeep Wrangler equipped with the 2.0L I4 DOHC DI Turbo Engine W/ESS (Sales Code EC1), built on or before January 30, 2024 (MDH 0130XX), may experience a Malfunction Indicator Lamp (MIL) illumination. This often accompanies one or more of the following Diagnostic Trouble Codes (DTCs):

• P0420 - Catalyst System Efficiency Below Threshold Bank 1
• P0017 - Crankshaft/camshaft Timing Misalignment - Bank 1 Sensor 2
• P000A - Bank 1 Camshaft 1 Position Slow Response
• P219A - Bank 1 Air-fuel Ratio Imbalance

Additionally, some owners might report a "no crank/no start condition." The PCM update also includes a software enhancement for "Smart Charge change: Battery life improvements."

Fault Codes / DTCs

This TSB specifically addresses the following Diagnostic Trouble Codes:

Code	Description
P0420	Catalyst System Efficiency Below Threshold Bank 1
P0017	Crankshaft/camshaft Timing Misalignment - Bank 1 Sensor 2
P000A	Bank 1 Camshaft 1 Position Slow Response
P219A	Bank 1 Air-fuel Ratio Imbalance

Diagnosis / Trigger Conditions

The primary trigger for this service bulletin is the illumination of the Malfunction Indicator Lamp (MIL) in conjunction with one or more of the listed DTCs. Technicians will use a Scan Tool, such as wiTECH, to verify the presence of these codes and other related system functions. The diagnostic process involves checking for engine oil contamination, inspecting Oil Control Valves (OCVs) for torn screens, and assessing the Powertrain Control Module (PCM) software level.

Repair Procedure Summary

Technical Service Bulletin (TSB) 18-011-25 outlines a comprehensive repair process for the 2024 Jeep Wrangler MIL illumination and associated DTCs. The procedure begins with scanning the PCM for DTCs. Depending on the specific DTCs present, the technician will follow a detailed flowchart:

1. Engine Oil Inspection: Check for metallic debris in the engine oil. If contaminated, the engine oil and filter will be replaced.
2. OCV Inspection and Replacement: Both Oil Control Valves (OCVs) will be removed and inspected for torn screens. If torn, the OCVs will be replaced, along with an engine oil and filter change.
3. PCM Software Level Check: The PCM's software level will be verified. If not at the latest version, the PCM will be reprogrammed.
4. Oxygen Sensor and Catalytic Converter Inspection: For P0420, technicians will check for other Oxygen Sensor (O2) DTCs. If no other O2 DTCs are present, the upstream Oxygen Sensor will be removed, and a borescope will be used to inspect the catalytic converter for internal melting, cracking, or a "brain pattern" (as shown in the TSB's figures).
5. Catalytic Converter Replacement: If the catalytic converter is found to be melted or cracked, it will be replaced.
6. PCM Reprogramming: The Powertrain Control Module (PCM) will be reprogrammed with the latest software. This is a critical step for addressing the 2024 Jeep Wrangler MIL illumination.
7. DTC Clearance and Test Drive: After reprogramming, all DTCs will be cleared, and the vehicle will be test-driven to ensure the DTCs do not reset.

Dealers must use "Failure Code CC" when processing this Technical Service Bulletin if the customer's concern matches the symptoms identified.

Required Tools or Parts

To perform the repairs outlined in TSB 18-011-25, technicians may require the following parts and special tools:

Parts:

• 05048148AE - Valve, Oil Control (Intake/Exhaust)
• 68629623AA - Converter, Catalytic - Front
• 68381406AC - Gasket, Turbocharger To Catalytic Converter (Mica Ring Gasket)
• 04892339BE - Filter, Engine Oil
• 05166241PA - Oil, Engine
• 05048234AB - Gasket - Cylinder Head Cover
• 68153921AA - Coolant
• 68377814AA - Sealer-RTV Gray (25KG RTV Container)
• 68409465AA - Sealer-RTV Gray (310ML RTV Container)

Special Tools:

• wiTECH or Equivalent (Diagnostic Scan Tool)
• Borescope
• Wrench, Camshaft Holding (Ref. No. 2050800090)

Important Warnings

Technicians performing the PCM reprogramming must adhere to specific battery voltage requirements:

• Battery Charger: Install a battery charger to ensure the battery voltage does not drop below 13.2 volts during the flash process. Do not allow the charging voltage to climb above 13.5 volts.
• Interrupted Flash: If the flash process is interrupted or aborted, it must be restarted from the beginning.

Owner Action

If your 2024 Jeep Wrangler is experiencing a Malfunction Indicator Lamp (MIL) illumination, displaying any of the listed DTCs (P0420, P0017, P000A, P219A), or exhibiting a "no crank/no start condition," it is recommended to visit an authorized Jeep dealership. The repairs described in TSB 18-011-25 are reimbursable within the provisions of the warranty.

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Source: NHTSA ID: 11015523