2022-2025 Jeep/RAM TPM Lamp On & DTCs C1501-C1504

Owners of 2022-2025 Jeep and RAM vehicles may encounter an illuminated "TPM Lamp On" warning light. This condition is often accompanied by specific diagnostic trouble codes (DTCs) related to the Tire Pressure Monitor (TPM) system. Manufacturer communication S2422000001 Rev. D provides guidance for technicians to diagnose and address these concerns, focusing on potential sensor issues and interference from aftermarket equipment.

Symptoms

Customers typically report that the "low tire warning lamp is ON" on their instrument cluster. This warning indicates a problem with the Tire Pressure Monitor system, even if the tire pressure itself appears correct. The "TPM Lamp On" condition can be intermittent or remain active.

Fault Codes / DTCs

When the "TPM Lamp On" warning appears, technicians may find one or more of the following diagnostic trouble codes (DTCs) stored in the vehicle's system:

• C1501
• C1502
• C1503
• C1504
• C1501-31
• C1502-31
• C1503-31
• C1504-31

These DTCs generally indicate a "tire pressure sensor mechanical failure/no signal," suggesting that a TPM sensor is either malfunctioning or not communicating properly with the vehicle's system.

Diagnosis and Trigger Conditions

Diagnosing the root cause of the "TPM Lamp On" and associated DTCs involves a systematic approach. First, technicians should verify tire pressure using a handheld gauge and inspect the wheels for any physical damage, such as cupping or feathering, which could affect sensor performance. Any physical damage to wheels or tires should be addressed before proceeding.

Next, an ATEQ TPM RKE tester is used to perform a "sniff test" to verify sensor locations and ensure they are working and properly learned by the vehicle. If sensors are confirmed to be functional, the focus shifts to potential interference. Technicians are advised to inquire if the "Jeep Wrangler TPM lamp on" warning illuminates in specific situations, such as at night or while towing a trailer, as this can point to intermittent interference.

Common Sources of Interference

A significant cause of TPM system malfunctions, even when sensors are working, is radio frequency (RF) interference from aftermarket equipment. This interference can block or disrupt TPM signals. Common sources include:

• Electrical accessories
• LED lighting (especially non-factory bulbs)
• RV equipment
• Aftermarket rear or backup cameras
• Toll road transponders
• Transceivers/radios (e.g., GMRS/FRS/CB/Ham)
• DC/AC inverters (Aftermarket)
• Loose wiring grounds
• Aftermarket wiring causing RF coupling
• Off-road or uplift modifications
• Aftermarket illuminated splash shields
• Disconnected, damaged, broken, or misrouted RFH antenna
• Other aftermarket devices introducing RF noise around 433Mhz
• Aftermarket GPS devices
• Aftermarket Wi-Fi hotspots
• Aftermarket window tint (especially those containing metal)
• Aftermarket rims with different valve stem location or sensor angle/clocking
• Non-factory valve stem caps
• Damaged TPM sensors during seasonal tire changes (e.g., winter tires)
• New tires installed that may be steel reinforced
• Engine misfires or secondary ignition induced into the wiring

If aftermarket equipment is identified as a potential source of interference, the customer should be advised to remove it. After removal, a drive test should be performed to confirm the TPM sensors are working correctly. If no aftermarket equipment is found, the technician will proceed with the normal service procedure.

Important Warnings

This manufacturer communication, S2422000001 Rev. D, serves as a record of past experiences and does not authorize warranty repairs. It does not provide definitive conclusions about what is wrong with a specific vehicle but rather captures known cases related to the vehicle symptom or condition. Technicians are responsible for determining the appropriate course of action for each individual case.

Owner Action

If your 2022-2025 Jeep or RAM vehicle displays the "TPM Lamp On" warning or you suspect a TPM issue, it is recommended to visit an authorized dealership. They have the specialized tools, such as the ATEQ TPM RKE tester, and the expertise to properly diagnose the problem, including identifying any aftermarket interference. Addressing the issue promptly can ensure the proper functioning of your vehicle's tire pressure monitoring system.

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Source: NHTSA ID: 11021039