2021-2025 Jeep & RAM TPM Lamp On TSB S2422000001

Symptoms of a TPM System Issue

The most common symptom owners will notice is the "TPM Lamp On" or the "low tire warning lamp is on" illuminated on the instrument cluster. This condition can be intermittent, appearing and disappearing, or it can be continuously active.

Associated Fault Codes (DTCs)

When the "Jeep Wrangler TPM lamp on" condition occurs, technicians may find one or more of the following diagnostic trouble codes (DTCs) stored in the vehicle's system. These codes generally point to a tire pressure sensor mechanical failure or a loss of signal from the sensor.

Diagnosis and Trigger Conditions

Before extensive diagnostics, the first step is to verify that all tires are properly inflated according to the vehicle's tire placard, typically located on the driver's door jamb. Technicians should also inspect the rims and tires for any physical damage, such as bad wear, severe cupping, or feathering, addressing these issues first if found.

A specialized tool, the ATEQ TPM RKE tester, is used to perform a "sniff test" to confirm the correct location and functionality of the tire pressure sensors. A critical part of the diagnostic process, as highlighted in Manufacturer Communication S2422000001 Rev. C, involves checking for aftermarket equipment that could interfere with the Tire Pressure Monitor (TPM) signals.

What Owners Should Know About Aftermarket Interference

The TSB S2422000001 Rev. C emphasizes that various aftermarket accessories can interfere with or block the Tire Pressure Monitor (TPM) signals, leading to the "TPM Lamp On" condition, even if the sensors themselves are functioning correctly. Owners should be aware of the following potential sources of interference:

• Electrical Accessories: Any non-factory electrical components.
• LED Lighting: Non-factory LED bulbs, even if they appear to be factory installed.
• RV Equipment: Equipment installed on recreational vehicles.
• Aftermarket Cameras: Rear or backup cameras not installed by the manufacturer.
• Toll Road Transponders: Devices used for electronic toll collection.
• Transceivers/Radios: Such as GMRS, FRS, CB, or Ham radios.
• DC/AC Inverters: Aftermarket power inverters.
• Wiring Issues: Loose wiring grounds or aftermarket wiring causing radio frequency (RF) coupling.
• Off-Road/Uplift Modifications: Changes made for off-road use or vehicle lifting.
• Aftermarket Illuminated Splash Shields: Decorative or functional shields with lighting.
• RFH Antenna Problems: A disconnected, damaged, broken, or misrouted Radio Frequency Hub (RFH) antenna.
• Other RF Noise Sources: Any aftermarket device introducing RF noise, particularly around 433Mhz.
• Aftermarket GPS Devices: Global Positioning System units.
• Aftermarket Wi-Fi Hotspots: Portable or installed Wi-Fi devices.
• Aftermarket Window Tint: Especially tints that contain metal.
• Aftermarket Rims: Rims with incorrect valve stem locations or sensor angle/clocking.
• Non-Factory Valve Stem Caps: Caps that are not original equipment.
• Damaged TPM Sensors: Sensors damaged during seasonal tire changes, such as when installing winter tires.
• New Tires: Tires that may be steel-reinforced, which can affect signal transmission.
• Engine Misfires: Engine misfires or secondary ignition issues that induce electrical interference into the wiring.

If aftermarket equipment is identified as the cause for the "Jeep Wrangler TPM lamp on" issue, owners will be advised to remove the interfering device. This allows the TPM sensors to re-learn and function correctly during a drive test. If no aftermarket interference is found, technicians will proceed with standard service procedures to diagnose and resolve the TPM concern.

Owner Action

If you experience the "TPM Lamp On" indicator in your 2021-2025 Jeep or RAM vehicle, first ensure that all your tires are inflated to the manufacturer's recommended pressure. If the lamp remains on, especially if you have any aftermarket accessories, consider that these might be interfering with your vehicle's TPM system. A visit to a qualified service center is recommended for a proper diagnosis. Technicians can use specialized tools like the ATEQ TPM RKE tester and refer to Manufacturer Communication S2422000001 Rev. C for detailed diagnostic steps to address the issue.

NHTSA ID: 11010511