
1996 GMC K2500 Sierra SL 6.5L No Boost
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...
FIX posted 4/14/2015
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Message Closed w/FIX
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VIN | 1GTGK29F3T |
Engine | 6.5 L / 8 cyl / DIESEL |
Trans | 4-speed Automatic (Electronic) |
Delivery | Fuel Injection / Dsl. EFI |
Emissions | OBD-II Compliant |
Symptoms | No Boost |
Occurs | Intermittently |
Trouble Codes
P1656 | PCM To VSA Unit Signal Line Circuit Malfunction |
Message Closed w/FIX
Vehicle Data
1996 GMC K2500 Sierra SL
VIN | 1GTGK29F3T |
Engine | 6.5 L / 8 cyl / DIESEL |
Trans | 4-speed Automatic (Electronic) |
Delivery | Fuel Injection / Dsl. EFI |
Emissions | OBD-II Compliant |
Symptoms | No Boost |
Occurs | Intermittently |
Trouble Codes
P1656 | PCM To VSA Unit Signal Line Circuit Malfunction |