Humvee GM TCM UART diagnostics cable

Jaltest JDC548.9 Humvee GM TCM UART Diagnostics Cable

The JDC548.9 is a genuine Cojali Jaltest diagnostic cable for Humvee vehicles equipped with GM Transmission Control Module (TCM) systems using the UART communication protocol. This is a highly specialized cable serving a specific niche: military and ex-military HMMWV vehicles, government fleet operators, and specialty shops that service High Mobility Multipurpose Wheeled Vehicles with GM automatic transmissions.

What This Cable Does

The Humvee platform uses a GM-derived automatic transmission with TCM communication over UART rather than the standard OBD protocols found on commercial trucks. The JDC548.9 bridges that proprietary UART interface to the Jaltest Link, allowing the diagnostic software to communicate with the TCM for fault retrieval, live data streaming, and transmission system analysis.

Key Specifications

• Part Number: JDC548.9
• Compatible System: Humvee (HMMWV) GM TCM UART interface
• Protocol: UART (Universal Asynchronous Receiver-Transmitter)
• Platform: Cojali Jaltest diagnostic system
• MSRP: 30.00 (Cojali USA 2025)

Full connector specifications and version compatibility details are pending. Contact us at 866-217-0063 to confirm this cable matches your specific Humvee variant before ordering.

Who Needs This Cable

Government fleet maintenance operations, military vehicle service depots, ex-military vehicle dealers and restorers, and specialty shops that work on HMMWV platforms. At 30, this cable reflects the specialized engineering required to interface with UART-based TCM systems — it is a niche tool but essential when you need it.

Why Buy From OEM Diagnostic Tools?

OEM Diagnostic Tools has specialized in professional diagnostic equipment since 2016. We carry genuine Cojali Jaltest cables with free shipping and real tech support. Call 866-217-0063 before ordering if you need to verify compatibility with your specific Humvee variant.

Call 866-217-0063 for quick answers and help!