Fault Codes/Cummins/177Cummins177UnclassifiedAir IntakeWhat This Code MeansWarning lamp active; Displayed message: AIR THROT DRIVE MECH SYS ERRORPossible Causes•Electronic Throttle Control Actuator - Mechanical System Not Responding or Out of AdjustmentRelated Cummins Fault Codes353935411763542175195196202203155Browse all Cummins fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for 177 on your specific Cummins unit — cited to the OEM manual, not a forum guess.Your question about 177GET THE ANSWERFree account required — we'll bring your question with you.