车型:2011年别克陆尊。行驶里程:230051km。故障现象:车辆打开钥匙,无论挡位杆置于任何位置,仪表挡位始终显示1挡(如图1所示),但挡位杆位置实际置于P或N挡时都可以启动车辆,同时车主反映车辆起步无力。利用诊断仪检测,发现ECM可以通信,但TCM单元却无法通信。故障分析:(1)TCM单元线路故障或控制单元损坏,导致无法通信。(2)内部模式开关(内置式挡位 Model: 2011 Buick Luzun. Mileage: 230051km. Fault phenomenon: the vehicle opens the key, regardless of gear lever placed in any position, the instrument gear always shows 1 block (Figure 1), but the gear lever position is actually placed in P or N block can start the vehicle at the same time Vehicle owners reflect the start of weakness. The use of diagnostic testing, found ECM can communicate, but the TCM unit can not communicate. Failure Analysis: (1) TCM unit line failure or control unit damage, resulting in failure to communicate. (2) Internal mode switch (built-in gear