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GM OBD Trouble Code 77

By Jim Taddei, May 1, 2009

Digital EGR solenoid #3 circuit error

On vehicles with three solenoid EGR valves an open or short on the solenoid 3 circuit will set code 77.

Fault Code Description

  • 77 - Digital EGR solenoid #3 circuit error

Symptoms

  • EGR solenoid 3 will not function

Common Problems

  • Broken wire to EGR valve
  • Faulty EGR valve

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