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What is the measured voltage on pin 11? Is this right at the connector? The code description states it can be from a high or low voltage. Does the engine start and run? As there is another pin that sends power to the auto stop relay. Only other thing I can think of would be the CAN bus circuit. With luck this info is to late and you have already gotten it fixed.
Wayne
hey so how did you fix your P0428 error? was it the temp sensor? or O2 sensor?
I am having the exact same issue. parked regen stops due to catalyst temp sesor reading too high. runs steady around 600c then instanly bolts to 999 and stops regen