Code 41, Cylinder select error

Due to the same ecm being used for different engines, it is important that the proper prom is installed for the particular engine, a incorrect prom, not installed properly, or faulty. Another cause  is the pins of the harness are not properly connected to the appropriate pins on the ecm, and/or the grounds could be open. For V8 applications, ecm pin D3 is grounded.

              B12 Use 4 cylinder input                  D3 Use 6 cylinder input
 4 cylinder                          Ground    4 cylinder                              Open            
 6 cylinder                           Open    6 cylinder                              Open
 8 cylinder                           Open    8 cylinder                              Ground

 The chart above shows the appropriate pins on the ecm that need to be grounded for proper engine family. 


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