GMC Chevrolet (CAN signal wire) diagnostics cable

Jaltest GMC Chevrolet CAN Signal Wire Diagnostics Cable (JDC405A)

The JDC405A is the genuine Cojali Jaltest diagnostic cable for GMC and Chevrolet light-duty commercial vehicles, connecting via the CAN signal wire. This is the required cable if you are running a Jaltest LCV (Light Commercial Vehicle) kit and need to cover GM-platform trucks — Silverado, Sierra, Express van, Savana, and similar heavy-duty GM gas and diesel trucks that do not communicate over a standard OBD-II port alone. At $210, it is a one-time purchase that unlocks full Jaltest diagnostic access to GM CAN bus systems on these vehicles.

What This Cable Does

The JDC405A bridges your Jaltest Link interface to GMC and Chevrolet vehicles via the CAN signal wire connection — the communication protocol used in GM light-duty commercial truck platforms. This is distinct from standard OBD-II and is specifically required for CAN bus access on these vehicles.

• Compatible Vehicles: GMC and Chevrolet heavy-duty, medium-duty, and light-duty trucks and vans (CAN signal wire equipped)
• Connection Type: CAN signal wire — required for GM platform vehicles not accessible via standard OBD alone
• Compatible Software Versions: Jaltest Link Version V8.1 and V9
• Compatible System: Jaltest LCV (Light Commercial Vehicle) diagnostic kit
• Genuine Cojali Part: OEM manufactured — not an aftermarket adapter
• Part Number: JDC405A
• MSRP: $210.00 (2025 Cojali USA Pricelist)
• Diagnostic Functions: Read and clear fault codes, view live data, actuator tests, and other Jaltest-supported functions on covered GM systems

Jaltest LCV System and GMC/Chevrolet Coverage

The Jaltest LCV kit (part number 79001002, $3,195 MSRP) covers all ECUs on light-duty commercial vehicles — gas and diesel engines, transmissions, ABS, aftertreatment, body, and chassis. Compatible brands include Ford, Hino, Dodge, Mercedes-Benz, Mitsubishi, and GM. The JDC405A is the specific cable that gives you access to GMC and Chevrolet vehicles on the CAN signal wire protocol. It is listed as an optional LCV cable in the official 2025 Cojali USA Pricelist and is required for full GM coverage.

Who Needs This Cable

Any shop running a Jaltest LCV kit that services GMC or Chevrolet commercial trucks needs the JDC405A. This includes fleet shops with mixed-brand vehicles, independent repair shops doing all-makes light-duty work, and service centers that regularly see Silverado HD, Sierra HD, Express, or Savana commercial vans. Without this cable, Jaltest cannot communicate over the CAN signal wire protocol on GM platform vehicles.

Why Buy From OEM Diagnostic Tools?

OEM Diagnostic Tools has been a specialist in professional diagnostic equipment since 2016. We carry the full Cojali Jaltest cable catalog — genuine OEM parts, not cheap substitutes that fail when you need them most. Free shipping on every order, free tech support at 866-217-0063, and honest guidance on whether this is the right cable for your exact vehicle and software version before you buy.

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