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2017 Ram 3500 EcoDiesel - Intermittent Power Loss, P0606 Code

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Mike T. · rep 0 · May 25, 2:26 AM · 1 replies · solved · Question

Vehicle: 2017 Ram 3500 Laramie

I'm having a really frustrating issue with my 2017 Ram 3500 Laramie with the 6.7L Cummins. Occasionally, while driving, I experience a sudden, brief loss of power, almost like a hiccup, and the truck feels sluggish. The Check Engine Light comes on and off intermittently, and when I check the codes, I sometimes see a P0606 (ECM/PCM Processor Fault).

This doesn't happen all the time, but it's concerning, especially when towing. The truck has 110,000 miles. Could this be a bad ECM, or something else triggering the code? I've checked battery terminals, and they seem fine.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:26 AM

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ClearTheCode admin answer:

  1. Understanding P0606 (ECM/PCM Processor Fault): This code indicates an internal fault within the Engine Control Module (ECM) or Powertrain Control Module (PCM). It suggests that the module's internal processor is not functioning correctly or reliably. Intermittent power loss and a P0606 often point to a critical electronic issue.

  2. Initial Diagnostic Steps:

    • Battery and Charging System Check: While you checked terminals, ensure the battery is fully charged and healthy. A weak battery or fluctuating voltage from the alternator can cause the ECM to misbehave. Have your battery and alternator professionally load-tested.
    • Ground Connections: Poor ground connections are a common cause of mysterious electrical issues. Inspect all engine and chassis ground straps and wires for corrosion, looseness, or damage. Ensure they are clean and securely fastened.
    • ECM/PCM Connectors: Carefully inspect the wiring harnesses and connectors leading to the ECM/PCM for any signs of corrosion, damage, or looseness. A poor connection can mimic an internal module fault.
    • Scan for Other Codes: Sometimes, a P0606 can be a secondary code triggered by another underlying issue that stresses the ECM. Use a capable scanner to check for any other pending or historical codes in all modules (BCM, ABS, etc.).

  3. Common Causes for P0606 and Intermittent Power Loss:

    • Failing ECM/PCM (internal component failure).
    • Poor battery or charging system performance (low voltage, spikes).
    • Corroded or loose ground connections.
    • Damaged or intermittent wiring to the ECM/PCM.
    • Voltage spikes from other faulty components (e.g., shorting solenoid, faulty sensor).

  4. When to See a Professional Shop:

    • If the issue persists after checking battery, charging system, and ground connections.
    • If you're unable to find any other contributing codes or external electrical issues.
    • Diagnosing an ECM/PCM fault often requires specialized diagnostic equipment to test module communication and integrity. Replacing an ECM is a significant repair that typically requires programming specific to your vehicle, which only a dealership or specialized shop can perform.
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