Cummins P1693 Engine Code – Diagnosis & Troubleshooting

What is P1693 on a Cummins? If you Google P1693, you will probably see something that reads “Turbo Charge Control Circuit Malfunction”. However, on Cummins turbo diesel engines, this code has nothing to do with the turbocharger.  P1693 is considered the “companion code”. It is triggered when the powertrain control module (PCM) detects a code that…