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P1656 Diagnostic Trouble Code Discussion for March 2015

Wastegate Solenoid Control Circuit Malfunction

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Trouble Ticket Help Requests for DTC P1656
Help Request Posted
1996 GMC K2500 Sierra SL 6.5L No Boost VIN: 1GTGK29F3T
P1656: Wastegate Solenoid Control Circuit Malfunction. ... 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 might be failing intermittently, sti...
March 27, 2015