GM OBD Trouble Code 55
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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