GM Code Reader (1982 – 1995) #3123

Safely and easily access the on-board computer to read ECM and ABS codes on most General Motors vehicles (domestic cars & trucks) from 1982 to 1995.

Free shipping | 1-Year Warranty


This product can expose you to chemicals including DiNP, which is known to the State of California to cause cancer.
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Read ECM and ABS Codes:

Safely access the on-board computer to read ECM and ABS codes.

Need more help?
Does the reader support Diesel vehicles?
No. The vehicle being tested must have a gas engine.

The "Check Engine" light on your instrument cluster will flash in a pattern sequence that signifies what the two-digit DTC number is. Please refer to Page 2-3 of the 3123 User Manual for more details. 

If the light does not blink refer to your vehicle's service manual for information regarding circuitry testing.
Please refer to section 2-6 of the manual for ECM Service Code removal, and sections 3-7 through 3-9 for ABS service code removal. Information on particular vehicles can also be found in the vehicle's service manual.
No. The code reader will not harm a vehicle's computer system.
No. The vehicle being tested must be one ton capacity or less.