GMC safari 1998 4.3 voltec Code p1626 start disable not key code correctly.wont start.

Question

Mi van safari have

Code p1626 Kay signal is don't work properly
Relearn is done
And still same don't process the signal won't star when switch to start detergent module is look good the key cilinder was change and relearn process was done.stay the same condition, better new ,starter new, same condition stay.wath I need to do after. Help can you.

Answer 1

P1626 Loss of serial communication with VTD

This depends on the passlock  system that the vehicle uses, If this is the mechanical key , use the auto learn procedure, and once started it to your advantage you disable the system by accessing the pass lock system near the key when the engine is running , cut the yellow wire. ( not to be confused with the airbag wire)

The following is the Auto Learn Procedure:

1. Insure the ignition key is in the ON position.
2. Clear all PASSLOCK/EVO module and VCM DTCs. Record and refer any VCM DTCs to A Powertrain On Board Diagnostic (OBD) System Check in Computers and Control Systems - 4.3L
3. Momentarily rotate the ignition key to the CRANK position (Do NOT start the vehicle), then release it to the RUN position (Do NOT key OFF in the process).
4. Wait 10 minutes . Observe the SECURITY indicator. Refer to the following list for the appropriate responses:

• • If the PASSLOCK sensor was replaced the SECURITY indicator will flash for the 10 minutes duration.
  • If the PASSLOCK/EVO module was replaced, the SECURITY indicator will flash for a few seconds and then remain ON for the remainder of the 10 minutes duration.
  • If the VCM was replaced with a new programmed VCM and connected to the vehicle for the first time, the vehicle will Stand and this procedure may not be necessary.
  • If the replacement VCM was connected to any vehicle at any other time, even momentarily, the SECURITY indicator will flash for a few seconds and then remain ON for the 10 minutes duration.

1. The SECURITY indicator will transition from flashing to ON briefly to OFF after 10 minutes if remaining in the ignition ON position.
2. Turn the ignition switch to the OFF position and wait for 10 seconds .
3. Repeat steps 3-6 two more times. The new security code is ready to be communicated among the PASSLOCK sensor, PASSLOCK/EVO module and VCM. The new password is learned on the next ignition lock cylinder cycle from OFF to CRANK to ON (start attempt).