P1923
Read the instructions below then start the fault diagnostic procedure.
Symptom: Loss of performance.
| P1923 | 
TCM Missing on BUS
Fault symptoms
| • | 
        Loss of performance.
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      |
On-Board Diagnostics
Enable criteria:
| - | 
        Turn Ignition On.
         | 
      |
Fault criteria:
| - | 
        Missing or faulty signal (via bus) from the TCM.
         | 
      |
System reaction to a fault:
| - | 
        Limp Home, torque limitation.
         | 
      |
For more information, see also:
- "Read Values" menu for a description of read values.
- "Activate" menu for a description of applications.
