Fault code p1404 on 2001 chevy silverado - 2001 Chevrolet Silverado 2500HD

engine light also is for the transmission faults
run the fault codes to find the servo/ solenoid that is not allowing ratio changes

code p 0719 refers to torque converter/brake switch B---circuit low====causes --wiring short to ground --torque converter /brake switch---ECM/TCM

a fault with crankshaft position sensor will cause a no injector pulse on your 2006 chevy silverado 2500HD with the 6.0 Liter engine. have you checked your diagnostic trouble codes

run the fault codes and check for TCM and reverse servo/ solenoid.

Well, code 336 is for a problem with the crank sensor, and code 171 is for fuel system too lean bank one which is the side with cylinder one. Since you have checked fuel pressure and I will assume fuel volume is good, the crank sensor or circuit could be at fault.

12 is not an error code, it means the sytem passes no fault codes found.

CODE P1632 THEFT DETERRENT FUEL DISABLE SIGNAL RECEIVED CONDITIONS.

Check the fault codes anyway. Did you do this fuel pressure testing while the loss of power was occurring? If no the test is invalid.

YOUR VEHICLE HAS DETECTED A FAULT IN THE AIRBAG CIRCUIT IT WILL HAVE TO HAVE CODE RETRIEVAL DONE TO DETERMINE WHAT CAUSE LIGHT TO STAY ON,I URGE YOU TO DO THIS SOON AS WHEN AN AIRBAG SYSTEM HAS GIVEN A FAULT CODE AND TURNED ON THE LIGHT THE SYSTEM IS DIABLED AND WILL NOT PROVIDE PROTECTION IN ACCIDENT