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2016 EcoDiesel - Coolant Loss & Check Engine Light - EGR Cooler?

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Mike T. · rep 0 · May 25, 2:27 AM · 1 replies · solved · Question

Vehicle: 2016 Ram 1500 EcoDiesel Laramie

My 2016 Ram 1500 EcoDiesel Laramie has been losing coolant lately, and I finally got a check engine light. I'm seeing a P0401 code on my scanner.

I've heard these EcoDiesels can have EGR cooler issues, and the symptoms seem to align. Is this a common problem for this model year and engine? What should I be looking for to confirm it?

The truck still runs okay, but I'm worried about further damage if I keep driving it like this. Any advice on diagnosis or what to expect for repairs would be greatly appreciated.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:27 AM

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ClearTheCode admin answer: The symptoms you're describing, especially coolant loss and a P0401 code (EGR Flow Insufficient), strongly suggest an issue with your 2016 Ram 1500 EcoDiesel's Exhaust Gas Recirculation (EGR) cooler. This is a known common failure point for this engine generation.

Here's what's likely happening and what you should do:

  1. Understand the Problem: The EGR cooler is designed to cool exhaust gases before they are recirculated into the engine to reduce NOx emissions. Over time, internal components can fail, leading to cracks or leaks that allow coolant to enter the exhaust stream or be consumed.
  2. Confirm Diagnosis:
    • Visual Inspection: Check for white smoke from the exhaust (a sign of coolant burning), especially on startup. Also, inspect the engine bay for any external coolant leaks.
    • Coolant System Pressure Test: A reputable shop can perform a pressure test to identify external or internal leaks that might not be immediately visible.
    • EGR System Check: A diagnostic scan tool can monitor EGR valve operation and flow rates, which might show inconsistencies if the cooler is failing.
  3. Common Causes:
    • Thermal Stress: Repeated heating and cooling cycles can cause material fatigue and cracking in the cooler's core.
    • Carbon Buildup: Excessive carbon can restrict flow, leading to increased pressure and stress on cooler components.
    • Design Flaw: Earlier EcoDiesel EGR coolers had a higher propensity for failure compared to revised designs.
  4. Repair:
    • EGR Cooler Replacement: The most common fix is to replace the entire EGR cooler assembly. This is a significant job requiring specialized tools and knowledge due to its location and complexity.
    • Coolant Flush: After replacement, a thorough coolant system flush is essential to remove any contaminants and ensure proper cooling system function.
  5. When to See a Shop:
    • Immediately: Continuing to drive with a leaking EGR cooler can lead to more severe engine damage, including cylinder head issues, DPF clogging, or even engine hydro-lock if enough coolant enters the cylinders. It's also a significant environmental concern.
    • Professional Diagnosis: Due to the complexity of the EcoDiesel engine and the EGR system, professional diagnosis and repair are highly recommended. They can ensure the correct part is installed and the system is properly bled and tested. Ignoring this issue can lead to far more costly repairs down the line.
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