Got up this morning and check engine light stayed on. Cycled key and got P 1693 code/ ecm,pcm companion code. I have the Diablo power puck and recently installed DTT valve body with the adjustable voltage regulator. Last month when I installed the voltage regulator I unpluged the ecm wire harness for the install and after got the same code. The code went away after cycling the switch. I have tried this several times and the code now stays. Is there a way to clear it without the scanner tool to get rid of the engine light. I can remove the puck for the trip to the dealer but the adjustable regulator is by the ecm and will probably be questioned. Any suggestions guys !!!!!!! Does anyone know if the puck or variable resistor for the tranee valve body would set this code! What will DC do when they see this little adjustable voltage regulator connected to the ecm wire harness!!!!