Code B335, Loss Of ECCP Or CRT Serial Data

This code can only be viewed as a history code, because if it was current, service diagnostics could not be entered. Most likely ECCP controls for heating and A/C will also be inoperative when loss of serial data occurs. Since serial data lines are redundant, a double open in circuit No. 800 has to occur to set this code; however, code will also set for a single open in power or ground supply to ECCP or CRT controller.

Fig 1: Code B335, Schematic, Loss of ECCP or CRT Serial Data

Courtesy of GENERAL MOTORS CORP.

Fig 2: Code B335, Harness View, Loss of ECCP or CRT Serial Data

Courtesy of GENERAL MOTORS CORP.