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Start with a proper diagnostic scan using a quality scan tool. Cheap scan tools may not communicate with the various modules in the vehicle and therefore will not display a code. Don't toss parts unnecessarily at the vehicle until you properly scan and retrieve the stored codes and then repair from there
If your code scanner does not provide definitions for the codes you can google the code letter and number. Most manufactures use the same definitions for their codes. Just type in your vehicle model and the code
Symptoms of a Bad PCM , vehicle won't start an run sometimes ! You have other modules involved here ! ABS an BRAKE light lit are problems with the anti-lock brakes ! A sensor maybe ! You need to have the vehicles modules scanned for DTC's - diagnostic trouble codes . An depending what year , make an model vehicle it can have several hundred different codes possible. Newer vehicles have up wards of 10 or more modules .Your going to need a better grade scan tool like the one in this video ! Auto Repair The OTC Genisys Touch Scan Tool Sounds like you need to take this to a pro !
What is the year make and model of the vehicle? If the "check engine" light is on that means the vehicle is trying to tell you that there is a problem and the codes need to be scanned. If you can safely drive it to an auto zone or advanced auto they will scan the codes for you for free. You should get a fault code(s) that starts with a P then four numbers, ex. p0601. These codes will basically tell you what could be wrong in the car. I personally recommend that once they scan the codes, have them clear the codes then scan it again to see which codes, if any, come back. The more info from you, on something like this, the better.
The Engine Control Module (ECM) receives two vehicle speed sensor signals via the Control Area Network (CAN) communication line. One is sent from Vehicle Dynamic Control (VDC) / Traction Control System (TCS) / Anti-Lock Brake System (ABS) control unit, and the other is from Transmission Control Module (TCM). ECMuses these two signals for engine control.Possible Causes:- VDC/TCS/ABS to ECM circuit harness is open or shorted - TCM to ECM circuit harness is open or shorted - VDC/TCS/ABS to ECM circuit connectors - TCM to ECM circuit connectors - Faulty revolution sensor