DTC Detected in Companion Module (Dodge)
The P1693 code means the vehicle's onboard diagnostic system has detected: DTC Detected in Companion Module (Dodge). This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $0 - $2000 (parts and labor)
Manufacturer-specific code. P1693 is a manufacturer-specific DTC, so its exact definition can differ by make, model, and year. Use the meaning above as a general guide, and always confirm it against your vehicle manufacturer's official service information (or a make-specific scan tool) before diagnosing or replacing parts.
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Common Symptoms
- Check Engine Light on
- May have additional warning lights
- No specific symptoms from this code alone
- Companion module has its own stored code
- Reduced engine performance possible
Probable Causes (Ranked by Likelihood)
- Active fault code in the injection pump module Very High
- Active fault code in the transmission control module High
- Active fault code in the turbo control module Moderate
- Communication error between ECM and companion module Low
Frequently Asked Questions
What is P1693?
P1693 is a companion code that simply tells you another module in the vehicle has a fault code stored. It does not indicate a specific problem itself.
Why do Dodge trucks set this code?
Chrysler/Dodge programmed P1693 as an alerting mechanism. When the injection pump, transmission, or other module stores a code, the ECM mirrors it with P1693 to turn on the Check Engine Light.
Do I need to fix P1693?
You need to fix whatever code the companion module has stored. Once that root cause is resolved, P1693 will clear automatically.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
-
Scan all vehicle modules, not just the ECM, to find the actual fault code in the companion module.
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The companion code is typically in the injection pump, transmission, or turbo module.
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Address the actual fault code found in the companion module. P1693 will clear when the root cause is fixed.
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Check all module communication by scanning for U-codes (communication fault codes).
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If no other codes are found, clear P1693 and monitor. It may have been set by a transient fault.
Commonly Affected Vehicles
- 1998-2007 Dodge Ram 2500 5.9L Cummins
- 1998-2007 Dodge Ram 3500 5.9L Cummins
- 2007-2012 Dodge Ram 2500 6.7L Cummins
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