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These Trouble Codes and procedures are for use for most 1982 thru 1992-1993 Buick vehicles that use a 12pin ALDL connector. Although this is a very simple and a some-what common procedure, like all helpful hints and/or suggestions, you are doing them at your own risk. If you should need help or need additional information with your Buick, please consult with your local Buick mechanic.

The Engine Control Module (ECM) is basically a computer. It uses sensors to read engine operating parameters. It knows what parameters should be under certain conditions. If a sensor reading is not what the ECM knows it should be, then the ECM will illuminate the amber "Service Engine Soon" or "Check Engine" light on the instrument panel. If or when this happens on your car, you can tell which sensors or codes are set/malfunctioning by using the Assembly Line Diagnostic Link connector (ALDL) (the ALDL is usually located under the dash). You can extract these codes by connecting terminal "B" with terminal "A". This will put the ECM into "diagnostic mode." You can use a Sunpro Code Scanner (CP9001 - for around $30 at your local car parts store) or simply use a paper-clip. However, for the best readings and to help with "tuning" of your car, you will ultimately want to purchase some sort of electronic scan tool or a program like TURBO-LINK that works on a laptop computer.

Using the Sunpro Code Scanner or the paper-clip method (which is great for out in the middle of now-where), this will "flash" the "Service Engine Soon" or "Check Engine" light a selected amount of times depending upon the code or sensor that may be at-fault. Here's what you will need to do. A piece of paper and a pencil would also be handy to write down any codes. Insert the Sunpro Code Scanner or the paper clip into the ALDL connector and switch the ignition into the "on" position. This is the first position before actually starting your car. DO NOT START THE CAR. You will see that in the "on" position a few lights on the instrument panel will illuminate including the "Service Engine Soon" or "Check Engine" light. (If this light is not on, you will not be able to continue and you might have a problem. Check first for a simple blown bulb. If its not the bulb than please take your car to a qualified mechanic to check it.) Ok, so if the light is on, you will see that it will start to flash. It should start with flashing a code 12 which means that the ECM is receiving information. You will see one flash, a pause, and then two flashes. This will be repeated three times. This is normal. Then, if your car has any other codes, you will see them using the same sort-of sequence. Example - a code 42 would be four flashes, a pause, and then two flashes. Once you get back to seeing the code 12 then your diagnostic procedures have been finished. You are now ready to use the chart below to determine your situation.

Please be aware that the codes listed are the most common and this may not be a complete listing.
CODE 12 - ECM functionally properly
CODE 13 - O2 Sensor - Open Circuit
CODE 14 - Coolant Temperature - High Reading
CODE 15 - Coolant Temperature - Low Reading
CODE 21 - Throttle Position Sensor (TPS) - High Reading
CODE 22 - Throttle Position Sensor (TPS) - Low Reading
CODE 23 - Manifold Air Temperature (MAT) - Low Reading
CODE 24 - Vehicle Speed Senor (VSS)
CODE 25 - Manifold Air Temperature (MAT) - High Reading
CODE 31 - Wastegate Selenoid - Turbo Cars only - Error
CODE 32 - Exhaust Gas Re-circulation (EGR)
CODE 33 - Mass Air Flow Sensor (MAF) - High Reading
CODE 34 - Mass Air Flow Sensor (MAF) - Low Reading
CODE 35 - Idle Air Control Valve
CODE 41 - Cam sensor (CAM)
CODE 42 - Electronic Spark Timing Circuit (EST)
CODE 43 - Electronic Spark Timing Circuit (EST)
CODE 44 - O2 Sensor - Lean Reading
CODE 45 - O2 Sensor - Rich Reading
CODE 51 - Electronic Control Module (ECM) - PROM Error
CODE 52 - Electronic Control Module (ECM) - Calpak Error
CODE 55 - Electronic Control Module (ECM) - Error

Do you know some Buick Trouble Codes that are not listed? Please let us know about them! Simply contact us by using the 'contact us' link below! Thanks!
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