How to Access Diagnostic Codes

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The Buick Reatta Onboard Diagnostic System is a powerful tool for troubleshooting problems with your Reatta. Every Reatta owner should get familiar with how to use it. 

 

Accessing the codes stored in the Reatta computers should always be your first step when trying to diagnose a problem with your Reatta.  Once you find out what codes are stored in the computers (ECM or BCM), post them in the forum with your request for assistance. Knowing the codes you have will make it easier for us to help diagnose problems with your Reatta.

 

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Below are some links to information that you will need when using the Reatta Onboard Diagnostic System.

 

How To Access ECM, BCM & CRT Trouble Codes Via Onboard Diagnostics:
1988-1989 Models 
1990-1991 Models

 

Diagnostic Code Charts:
BCM & CRT Diagnostic Code Chart
ECM Diagnostic Code Chart

 

Reatta Onboard Diagnostics Booklet:
1988 & 89 Models

 

Feel free to ask any questions you might have about accessing computer codes in this topic.