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1996 GMC K2500 Sierra SL 6.5L No Boost
Posted to GM Driveability on 3/27/2015 7 Replies

This 6.5 intermittently has no boost and sets the code P1656. Has good vacuum to wastegate solenoid and the lines are in good condition. The wastegate actuator holds vacuum and the wastegate seems to move freely. I have replaced the solenoid, suspecting it mig...

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  Related Documents & Media  1996 GMC K2500 Sierra SL

 
Message Closed w/FIX

car Vehicle Data

1996 GMC K2500 Sierra SL

VIN 1GTGK29F3T
Engine6.5 L / 8 cyl / DIESEL
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection / Dsl. EFI
EmissionsOBD-II Compliant
SymptomsNo Boost
OccursIntermittently

Trouble Codes

P1656PCM To VSA Unit Signal Line Circuit Malfunction
Message Closed w/FIX

car Vehicle Data

1996 GMC K2500 Sierra SL

VIN 1GTGK29F3T
Engine6.5 L / 8 cyl / DIESEL
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection / Dsl. EFI
EmissionsOBD-II Compliant
SymptomsNo Boost
OccursIntermittently

Trouble Codes

P1656PCM To VSA Unit Signal Line Circuit Malfunction