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Ted G.
Ted G., ASE Certified Technician
Category: Chevy
Satisfied Customers: 6138
Experience:  20 years auto repair experience, ASE Master Tech, Mechanical Failure consultant, Expert Witness
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2003 S10 4.

Resolved Question:

2003 S10 4.3 engine code 1626 engines fires fuel pressure good will not start
Submitted: 6 years ago.
Category: Chevy
Expert:  Ted G. replied 6 years ago.
Here is the description of what is happening:

The control module communicates with other modules using the Class 2 Serial Data circuit. The vehicle theft deterrent (VTD) body control module (BCM) sends a vehicle security password XXXXX the powertrain control module (PCM), via the Class 2 Serial Data circuit, after the BCM has sensed the proper operation of the ignition switch and lock, and determined that the switch and lock have not been tampered with. If this password XXXXX the password XXXXX in the PCM, fuel will be enabled. If the BCM does not send a password, or if the PCM does not receive it, the vehicle will not start, or it may start and stall. This will set a DTC P1626 in the PCM memory. If communication is lost after receiving the password, the VTD Passlock system will go into Fail Enable, set a U1192 in the PCM memory, and the engine will continue to run. This will allow the engine to restart on future ignition cycles but may set a DTC P1626 as the engine is started. If the battery is disconnected or the codes are cleared, the vehicle will lose its Fail Enable status and will not start until communication is re-established.

To properly check it you need a GM scan tool because you have to see what is working in the chain and what is not. Then you have to check connections between the units and finally if that is all good then one of the units is failed.
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