Equus 3123 GM Code Reader

by Equus

Product Features

• Diagnostic trouble codes flash on the dashboard's "check engine" light
• Retrieves ECM and ABS vehicle computer codes
• Connects to your vehicle's computer self-test connector
• Includes instructions in English, French and Spanish
• Will not harm a vehicle's computer system

Product Details

Product Manual [1.74mb PDF]

• Product Dimensions: 10 x 2 x 6 inches ; 11.2 ounces
• Shipping Weight: 12 ounces (View shipping rates and policies)
• Shipping: This item is also available for shipping to select countries outside the U.S.
• ASIN: B000EVU8C0
• Item model number: 3123
• Average Customer Review: 2.7 out of 5 stars  See all reviews (10 customer reviews)
• Amazon Best Sellers Rank: #18,867 in Automotive (See Top 100 in Automotive)
  • #65 in Automotive > Tools & Equipment > Diagnostic & Test Tools > Code Readers & Scan Tools

Product Description

This code reader accesses a vehicle's on-board computer to retrieve engine and electronic transmission codes and ABS vehicle computer codes. It connects to your vehicle's computer self-test connector and shows the trouble through your vehicle's "check engine" light. It includes detailed instructions in English, French, and Spanish with illustrations and code definitions applications.

Customer Reviews

Most Helpful Customer Reviews

9 of 9 people found the following review helpful:

4.0 out of 5 stars Good for what its worth, September 23, 2009

By 

R. Boyd (California) - See all my reviews
(REAL NAME)   

This review is from: Equus 3123 GM Code Reader (Misc.)

It is a great tool for what it does. It is very simple and compact and light. It will flash the light on the dash and give you a flashing code that you look up but you might be surprised to know that all you really need is a paper clip and the knowledge of which 2 pins in the OBD1 connector to short together and you will save money. Please be sure you know which 2 pins before you try anything maybe even if you have a technician that you know or go to could give you some incite but they might not. The pins that must touch for engine codes are A and B. For ABS(anti-lock braking system) you must touch pins A and H. Hope this helps you in your diagnosis.

7 of 8 people found the following review helpful:

5.0 out of 5 stars Easy to use reader., July 11, 2008

By 

J. Sterling - See all my reviews
(REAL NAME)   

Amazon Verified Purchase

This review is from: Equus 3123 GM Code Reader (Misc.)

I use it on my 1987 IROC Camaro which has two methods of diagnosing the Engine lights. One is a jumper cable, the other is using a tool such as this. All I have to do is pop it in, turn the key to ON, and read the codes. Very simple, very light, does not require a degree to use. The booklet that comes with it has a list of codes, their descriptions, and how to start collect the codes from the ECU. However, any GM car repair manual will/should have the same list. It is cheap, and it does what I need it to do.

7 of 8 people found the following review helpful:

5.0 out of 5 stars Nice gadget, May 12, 2008

By 

Gerald M. Coffee "Peep O'Day Boy" (Dallas, Texas) - See all my reviews
(REAL NAME)   

This review is from: Equus 3123 GM Code Reader (Misc.)

This product is handy to have to locate a source of a "Service Engine Soon" light. It merely grounds the ECM engine pin or the ABS brake pin which are located in the diagonsitc port under the dash and causes the SES light to flash the ECM codes. A paper clip can do the same thing but the GM Code Reader is better because it a accurate and positive fit. The GM Code Reader will only indicate the ECM code and will not tell you anything else after the SES light is seen. Then you must determine what is causing the code to appear. This product is a OBD-1 Code Reader for 1982-1993/4 vehicles and is not the OBD-2 Code Scanner that must be used on the 1995 and later vehicles. The latter has a screen and gives more information with the code. Using the GM Code Reader is a fifteen minute job and gives you a good starting point for locating the trouble and saves you $90 or more by not requiring a so-called "professional" auto mechanic do it for you. It will more than pay for itself after you use it one time.

The first code I observed when I first used the GM Code Reader on my 1991 Chevrolet S10 Blazer SUV was the infamous Code 32, a EGR system malfunction. It apparently was a false code or a temporary code because I did not do or replace anything to correct the problem and the "SES" light has never returned.