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P0603 Cadillac Code - Control Module Long Term Memory Reset

- Code Popularity: 8,673 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC P0603 Cadillac?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Low battery voltage
  • Reprogram Engine Control Module (ECM)
  • Faulty Engine Control Module
  • Engine Control Module harness is open or shorted
  • Engine Control Module circuit poor electrical connection
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How to Fix the DTC P0603 Cadillac?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Code Tech Notes

Start by charging the vehicle's battery and clean terminal, once the battery is charged and the terminals are clean and secured, erase the code. If the code comes back ON, then you may have to reprogram or replace Powertrain Control Module (PCM).

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0603 Cadillac code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Engine may not start

Code P0603 Cadillac Description

This diagnostic applies to internal microprocessor integrity conditions within the Engine Control Module (ECM). This diagnostic also addresses if the ECM is not programmed. The ECM monitors its ability to read and write to the memory. It also monitors a timing function. No external circuits are involved. The Diagnostic Trouble Code (DTC) will be set when the ECM detects an internal failure or incomplete programming for more than 10 s.

OBDII Code P0603 Cadillac - Control Module Long Term Memory Reset - AutoCodes.com
P0603 Cadillac Code - Control Module Long Term Memory Reset

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Code P0603 Cadillac comments

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