OBDSTAR | SKU: TCM-020

OBDSTAR (TCM-020) | GM (6T70/75/80) 23-pins TCM – 15-pins DB15 Adapter Cable | Passenger Car

Name: OBDSTAR (TCM-020) | GM (6T70/75/80) 23-pins TCM – 15-pins DB15 Adapter Cable | Passenger Car
Brand: OBDSTAR
SKU: TCM-020
Price: 29.95 EUR
Availability: InStock

€29,95 incl.

€24,75 excl.

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The OBDSTAR TCM-020 is an adapter cable featuring a 23-pin connector on the vehicle side for the transmission control module and a 15-pin DB15 connector on the device side. The 23-pin side connects directly to the TEHCM of a GM 6T70, 6T75, or 6T80 Hydra-Matic six-speed automatic transmission — the integrated module that houses the transmission computer, solenoids, and sensors in a single unit.

Because the TEHCM is an integrated assembly physically located within the transmission, it has its own 23-pin connector. Through this connector, the cable establishes a bench connection with your OBDSTAR programmer, allowing you to read and write to the module outside the vehicle. This means you can perform transmission programming without a running or fully wired car, even with GM Generation 1, Gen 2, or Gen 3 modules.

This cable is designed exclusively for bench work — it cannot be connected through the vehicle's OBD2 port. It provides access to the transmission module only, and whether reading, programming, or cloning is possible depends on your OBDSTAR device's software capabilities.

KEY BENEFITS

✔Bench programming — access the TEHCM without a running or fully wired vehicle.

✔Three transmission variants — 6T70, 6T75, and 6T80 in one cable, compatible with multiple torque ratings and drivetrain configurations.

✔Broad vehicle coverage — applications for Buick, Cadillac, Chevrolet, GMC, Opel/Vauxhall, and Saab, roughly built between 2007 and 2020.

✔No intermediate adapters — the 23-pin connector plugs directly into the integrated transmission module with no additional wiring.

IMPORTANT NOTES

✕OBDSTAR only — this cable is designed for OBDSTAR diagnostic and programming devices and cannot be used with diagnostic equipment from other manufacturers.

✕No extended functionality — the cable makes the module accessible; which read and write operations are available depends on your device's software.

✕Module must be removed — the TEHCM is located inside the transmission and must be removed before you can connect.

✕Not via OBD2 port — this cable is for bench use only and cannot be connected to the diagnostic port; longitudinal or other GM automatics outside the 6T70/6T75/6T80 family are not supported.

Applications and Functions

The TCM-020 connects the TEHCM of a GM 6T70, 6T75, or 6T80 transmission to the DB15 input on your OBDSTAR device.

Control modules you can access

TEHCM of the GM 6T70/6T75/6T80: the integrated module containing the transmission computer, solenoids, and sensors in one housing.
Removed module: the connector is designed for a TEHCM that has been removed from the transmission and placed on the workbench.

What you can do

Read TCM data: retrieve programming data and calibration parameters from the TEHCM, including software version and transmission configuration.
Program the TCM: Write new software or calibrations to the module via the bench connection, without an active or fully wired vehicle.
Clone the module: Copy the programming from a donor module to a replacement TEHCM within the same transmission family.
Identify the module: Read module-specific data such as Part Number and Calibration ID for verification before and after programming.
Important: Which operations are actually available depends on your OBDSTAR device's software and license; the cable only provides the connection.

Compatible vehicles and applications

The transmission type is what matters, not the model. The vehicles listed below are equipped with a GM 6T70, 6T75, or 6T80 Hydra-Matic transmission; only confirmed models and model years are included.

Buick:

Enclave (GMT Lambda): (2008–2017)
LaCrosse: (2010–2016)
Regal (AWD Turbo variants): (2012–2017)

Cadillac:

SRX: (2010–2016)
XT5 (early models): (2017–2019)
XTS: (2013–2019)

Chevrolet:

Captiva / Captiva Sport (V6 variants): (2008–2015)
Equinox (3.0L & 3.6L V6): (2008–2017)
Impala (3.6L V6): (2012–2020)
Malibu (V6 models): (2008–2012)
Traverse: (2009–2017)

GMC:

Acadia: (2007–2016)
Terrain (3.0L & 3.6L V6): (2010–2017)

Opel / Vauxhall:

Antara (3.2 V6 / AWD variants): (2007–2015)
Insignia A (2.8 V6 Turbo OPC / AWD): (2009–2017)

Saab:

9-4X (3.0L & 2.8T V6): (2011)
9-5 II (2.8T V6 Aero XWD): (2010–2011)

💡

Good to know: the GM 6T70, 6T75, and 6T80 transmissions feature an integrated TEHCM (transmission electronic control module) that is physically mounted inside the gearbox. For bench programming, this module must first be removed from the transmission; without removing it, you cannot connect the TCM-020. Verify that you can remove the module and that the transmission type is correct before ordering.

Package contents

1x OBDSTAR (TCM-020) | GM (6T70/75/80) 23-pin TCM – 15-pin DB15 Adapter Cable | Passenger Vehicle

Technical specifications

Specification	Description
Brand	OBDSTAR
Part number	TCM-020
Type	Adapter cable
Application	Bench reading and programming of the TEHCM for GM 6T70/6T75/6T80 transmissions
Vehicle-side connector	GM (6T70/75/80) 23-pin TCM
Device-side connector	15-pin DB15
Control units	Integrated transmission control module (TEHCM)
Segment	Passenger vehicle
Supported brands	Buick, Cadillac, Chevrolet, GMC, Opel / Vauxhall, and Saab
Model range	Models equipped with a GM 6T70, 6T75, or 6T80 Hydra-Matic transmission (2007–2020)
Required to use	OBDSTAR programmer with 15-pin DB15 interface, such as the DC706 with MP001 kit
Weight	0.1 kg