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2000 Dodge Cummins P1693 Code: Diagnosis and Solutions for Fuel System Issues

Model: 2000 dodge cummins Fault Code: P1693 Posted: 2007-12-17 21:49

My 2000 Dodge Cummins has been in my family since 2000. I purchased it from my father in 2002 with approximately 40-50,000 miles. Since then, the truck has consistently underperformed—never reaching expected mileage or power levels. I've noticed that gear shifts feel slightly unusual. Although I’ve spent years working on gas vehicles, I lack sufficient diesel engine experience to properly diagnose and fix this issue. I’ve been clearing the P1693 diagnostic trouble code (DTC) using a scan tool, but it returns every time. The fuel injectors and lift pump were replaced at 100,000 miles. I've also installed a B&D auxiliary lift pump, and fuel pressure remains stable at 18 psi. Despite these efforts, the problem persists. Can anyone provide insight into what might be causing this P1693 code or how to properly diagnose it in a 2000 Dodge Cummins? Any advice on next steps would be greatly appreciated.

Related fault codes
P1693
Comments (4)
Anonymous 2007-12-18 09:54

The specific meaning of the P1693 code would help clarify the issue. Could you confirm what the code indicates in your vehicle's service manual or scanner output?

Anonymous 2007-12-18 19:27

I checked the factory manual, and it states that DTC P1693 is detected by the Powertrain Control Module (PCM) or Engine Control Module (ECM). I'm new to diesel diagnostics, so any clarification on this code would be very helpful—thank you for your response.

Anonymous 2007-12-18 19:33

The truck was manufactured in Canada and underwent modifications when imported to the U.S. This has made it difficult to get a scanner to communicate with the vehicle. It only responds to generic OBD-II protocols, not the Chrysler-specific software—this is confusing and may impact accurate code reading.

Anonymous 2007-12-18 19:46

A dealership-grade scan tool might be able to read the P1693 code reliably since it can interface with the Cummins engine control system. The fact that the code appears means the PCM has logged a fault—this suggests an issue in fuel delivery or sensor feedback, even if pressure is within range.