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I have the same problem. Did you figure yours out? I could use some help. Thanks
What year, make and model vehicle? Same as above? Do you know what happens when you turn the key to the start position or push the start button, which ever your vehicle has. There are complex electronics involved here. Plus, whatever fixed the other persons vehicle probably it's what's wrong with yours.
Circuit Description
When the ignition switch is turned to the Start position, the body control module (BCM) receives battery voltage on the ignition 1 voltage circuit, and less than 5 volts on the off/run/crank voltage circuit. The BCM supplies voltage to energize the RUN/CRANK Relay 32. The BCM sends a high speed GMLAN serial data message to the engine control module (ECM) that the key is in the start position. The ECM receives the message from the BCM, and also receives a serial data message from the transmission control module (TCM) containing the shift lever position. If the shift lever is in Park or Neutral when ignition switch is turned to Start, the ECM supplies voltage to the START Relay 31. The START relay supplies voltage to the S terminal of the starter solenoid, through the 30 A STRTR Fuse 26, in order to crank the engine.
Hooking up a factory or some other type professional scan tool an doing a full system scan. Every module on the vehicle. Do yourself a favor an take it to a qualified repair shop
Do you know what high speed GMLAN serial data messaging is?
A High Speed GMLAN Bus is used where data needs to be exchanged at a high enough rate to minimize the delay between the occurrence of a change in sensor value and the reception of this information by a control device using the information to adjust vehicle system performance. The High Speed GMLAN serial data network consists of two twisted wires.
https://www.newcaprice.com/forum/viewtop...
When you turn the key to on position (not start) does the check engine light turn on? The engine computer after getting message from the BCM energizes the starter relay to crank the engine, if the engine computer isn't communicating that won't happen. Try putting the gear selector in neutral an see if it cranks then .
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