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GM OBD Trouble Code 55

By Jim Taddei, May 1, 2009

Engine Control Module error

Digital EGR valve solenoid 3 error

  • Depending on the model, code 55 can refer to two different systems.
  • Please choose from one of the above links for specific information on each system.

Engine Control Module error

The ECM monitors it's internal circuitry and if a fault is noted code 55 will set.

Fault Code Description

  • 55 -ECM error

Symptoms

  • Engine may not start

Common Problems

  • Failed ECM
  • In some cases a faulty O2 sensor can cause a code 55

Digital EGR valve solenoid 3 error

On vehicles with three solenoid EGR valves an open or short on the solenoid 3 circuit will set code 55.

Fault Code Description

  • 55 - Digital EGR valve solenoid 3 error

Symptoms

  • EGR solenoid 3 will not function

Common Problems

  • Broken wire to EGR valve
  • Faulty EGR valve

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