Same goes for an 8 cylinder PCM will sometimes work in a 6 cyl vehicle, but the reverse is not true. Eg an NA 6 cylinder PCM will work in a turbo vehicle, however the wastegate output will not function. Some part numbers are compatible with others however they will be missing IO. If you have diagnosed a PCM failure you must replace the PCM with the same part number such as ASU-234 etc. If the vehicle has had an engine swap please ensure that you have continuity in your CAN Bus and all grounds are clean. We have also rarely seen injector drivers fail, usually this is due to a failed injector shorting out.īefore assuming a failed PCM do a KAM reset (performed automatically when writing a file to the PCM via PCMTEC) and check your power/ground sources. The only PCMs we have seen fail to date are very early BA's which appear to start resetting when very hot or cold which we believe is due to cracks appearing in the PCB.
This guide explains the steps to follow when replacing a failed PCM.
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