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I know my trouble codes but they are dealership codes. how do i find out what they mean?

How do i find out what my OBD codes are telling me when they are dealership codes.

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  • tendr247
    tendr247 Nov 01, 2012

    my car is a 1990 buick riviera and the code is 6420c ( i think the c means current) it's a dealership code and i need to know what it means.

  • tendr247
    tendr247 Nov 03, 2012

    those codes are no.2 codes for newer cars.

  • tendr247
    tendr247 Nov 03, 2012

    i need DEALERSHIP codes for 1990 buick riviera. I thought for sure someone out there with the same car had at sometime had the same problem and could help. today's my daughter's wedding and i have to try to find a ride there. NO FUN.



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Posted on Nov 01, 2012


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SOURCE: trouble codes

Means 62 PCM failure SRI mile not stored.

The service manual says : replace PCM.

Disconnect battery ground for twenty minutes, if you keep getting the code you should replace PCM module.

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U0121 Communication error to ABS HU/CM

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First the fault codes,
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SOURCE: OBD system diagnostic trouble codes?

po123-tps curcuit high---po138-02 sensor high volts bank 1 sensor 2,--po205--injector curcuit open cylinder 5,---po305-- misfire cylinder 5,--po300 random/multible mis fire,

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