2022-2025 Jeep Compass/Renegade Spark Plug Melting TSB

Important Regional Advisory

It is crucial for owners to note that Technical Service Bulletin (TSB) 09-026-25, which addresses the Jeep Compass spark plug melting issue, is specifically applicable to the South America market. This bulletin does not apply to vehicles built for the US market. Owners in the US should consult their local dealership for any similar symptoms.

Symptoms of Spark Plug Melting

Owners of affected 2022-2025 Jeep Compass, Jeep Renegade, and Jeep Commander vehicles equipped with the 1.3L I4 Turbo MAIR DI Engine w/ESS E100 (Sales Code EYJ) may observe several indicators of spark plug melting. The primary symptom is a "Malfunction Indicator Lamp (MIL) illumination" on the dashboard.

Beyond the warning light, drivers might also experience noticeable changes in engine performance. These include the engine making a "loud metallic knocking noise at idle," difficulty starting the vehicle, and a generally "rough and noisy idle." If you encounter these symptoms, it's important to have your vehicle inspected promptly.

Associated Fault Codes (DTCs)

When the Jeep Compass spark plug melting condition occurs, the vehicle's diagnostic system is likely to store specific Diagnostic Trouble Codes (DTCs). These codes indicate engine misfires and combustion issues. Technicians will look for one or more of the following DTCs:

Code	Description
P0300-00	Random/Multiple Cylinder - Misfire Detected
P0301-00	Cylinder 1 - Misfire Detected
P0302-00	Cylinder 2 - Misfire Detected
P0303-00	Cylinder 3 - Misfire Detected
P0304-00	Cylinder 4 - Misfire Detected
P1336-00	Combustion misfiring (impact on catalytic converter) : Cylinder undetermined
P1337	Combustion misfiring (impact on catalytic converter) : Cylinder 1
P1338	Combustion misfiring (impact on catalytic converter) : Cylinder 2
P1339	Combustion misfiring (impact on catalytic converter) : Cylinder 3
P1340	Combustion misfiring (impact on catalytic converter) : Cylinder 4

Diagnosis of the Spark Plug Melting Issue

Diagnosing the Jeep Compass spark plug melting issue involves a systematic approach using a wiTECH scan tool. Technicians will first scan for DTCs and verify that all related systems are functioning correctly. If other DTCs or symptom conditions are present, they must be addressed before proceeding with this bulletin.

During the diagnostic process, specific checks are performed. If DTCs P0087, P0088, P0089, P006C, or P06DD are active or stored, this TSB is not applicable, and other service bulletins or technical documentation should be consulted. Similarly, if coolant or engine oil leaks/consumption are detected, this TSB should not be followed. The spark plugs are then removed and visually inspected for melted electrodes. A borescope is used to check for internal cylinder damage to valves, cylinder heads, or pistons.

Repair Procedure Summary

The repair for the Jeep Compass spark plug melting issue, as outlined in TSB 09-026-25, primarily involves inspecting and replacing the spark plugs. After initial diagnostic checks and confirming the spark plug electrodes are melted, the technician will proceed with the repair. This includes collecting necessary parts for engine repair if internal cylinder damage is found.

The detailed steps involve removing the spark plugs, inspecting them for melting, and checking the cylinders with a borescope for any damage. If damage is present, additional engine repair may be required. Finally, new spark plugs are installed, and all stored DTCs are cleared. Technicians are also advised to check for and perform any available software updates for the Engine Control Module (ECM) using wiTECH.

Required Tools and Parts

For the diagnosis and repair of the Jeep Compass spark plug melting condition, specific tools and parts are necessary:

• Scan Tool: wiTECH or equivalent diagnostic tool.
• Inspection Tool: Borescope (or automotive videoscope) for internal cylinder inspection.
• Spark Plugs: Four new spark plugs. The recommended part numbers are MOPAR 68566749AA or 46336161 (SA).

Important Warnings and Exclusions

This TSB is not applicable in several specific scenarios. Technicians are cautioned not to perform this bulletin if any of the following conditions are met:

• Use of fuel that is outside technical specifications, such as adulterated gasoline or poor-quality ethanol.
• Installation of spark plugs that are incompatible with the original design, including incorrect heat range or non-approved models.
• Incorrect spark plug installation, such as inadequate tightening or non-spec torque, during a previous service.
• Unauthorized ECU reprogramming, including chip tuning or remapping.
• Use of non-approved performance systems or accessories like downpipes, intercoolers, or modified turbos.
• Installation of a non-approved or improperly calibrated Compressed Natural Gas (CNG) system.
• Lack of preventive maintenance on the ignition or fuel system, including spark plugs and fuel filters.
• Frequent, severe driving conditions that are outside normal operating standards, such as continuous high RPM use, closed tracks, or competitions.

Additionally, if unburned oil is found on spark plug electrodes, it may indicate a need to remove pistons to inspect piston rings, grooves, and cylinders for issues like out-of-roundness or concentricity.

Warranty Information

The repair described in TSB 09-026-25 is reimbursable under the provisions of the vehicle's warranty. The labor operation number for this service is 08-17-02-9D, with a labor time of 0.6 hours and a failure code of ZZ. Technicians should consult the current Warranty Manual for possible Prior Authorization before performing repairs, especially since the exact parts needed for engine repair cannot always be predicted in advance.

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Source: NHTSA ID: 11023069