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I have done a voltage test for the ECBM and have 12.49 volts at the pin locations A,B and C. I also have a brand new battery, I installed new delco coils about 6 months ago, Full tank of gas, Miss fire history shows cylinder 4 (28), cylinder 5 (14)and cylinder 6 (57)

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B0665,C0121,C0899,C0281

P0430,P0300,P0304,P0305,P0306

B0665... I don't find this one on my list of codes

C0121 - Valve Relay Circuit Malfunction .... this is related to the ABS problem...

C0899 - Power Supply Circuit Low Voltage... This is related to the Electronic Brake Control Module.

C0281 - Brake Switch Circuit ... This one turns on the "BRAKE" light...

P0430 - Catalyst System Low Efficiency Bank 2... This will turn on the CHECK ENGINE LIGHT.

And you already know what P0300,P0304,P0305,P0306 mean...

You have something affecting cylinder 4, 5 and 6... at more or less the same time.

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