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2021 Gladiator EcoDiesel - DEF System Warning P20EE

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Mike T. · rep 0 · May 25, 2:21 AM · 1 replies · solved · Question

Vehicle: 2021 Jeep Gladiator Rubicon EcoDiesel

Hello everyone, I'm having some trouble with my 2021 Jeep Gladiator Rubicon EcoDiesel. The dreaded DEF system warning light came on, along with the check engine light, and I'm getting a P20EE code. It says 'SCR NOx Catalyst Efficiency Below Threshold (Bank 1)'.

I've made sure the DEF tank is full, and I'm using good quality DEF fluid. I know these diesel systems can be sensitive, but I'm worried about being derated or having a costly repair. Has anyone else with an EcoDiesel Gladiator experienced this, and what was the fix?

Any insights would be super helpful!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:21 AM

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ClearTheCode admin answer:

The P20EE code on your 2021 Jeep Gladiator EcoDiesel indicates an issue with the Selective Catalytic Reduction (SCR) system's NOx catalyst efficiency. This is a critical part of the vehicle's emissions control, and issues here can lead to performance derates if not addressed promptly.

Common Causes:

  1. Faulty NOx Sensors: The most common cause for a P20EE code. The SCR system relies on upstream and downstream NOx sensors to monitor catalyst efficiency. If one or both are faulty, they can send incorrect readings, triggering the code.
  2. DEF Injector Issues: A clogged, faulty, or leaking Diesel Exhaust Fluid (DEF) injector can prevent the proper amount of DEF from being sprayed into the exhaust, leading to inefficient NOx reduction.
  3. Contaminated or Low DEF: While you mentioned using good quality DEF, using old, contaminated, or non-spec DEF can cause problems. Also, ensure the tank is truly full and the sensor is reading correctly.
  4. SCR Catalyst Failure: Less common, but the SCR catalyst itself can become less efficient over time due to soot buildup or internal damage.
  5. Exhaust Leaks: Leaks in the exhaust system upstream of the NOx sensors can affect their readings.

Troubleshooting Steps:

  1. Check DEF Quality and Level: Double-check that the DEF is fresh and meets ISO 22241 standards. Ensure the tank is completely full and the level sensor is not faulty (though this usually triggers other codes).
  2. Visual Inspection: Look for any signs of DEF leakage around the injector or exhaust system, and check for exhaust leaks.
  3. Professional Scan Tool Diagnosis: A dealership or a shop with advanced diesel diagnostic tools can monitor live data from the NOx sensors and DEF injector. This is crucial for pinpointing whether a sensor is faulty or if the DEF injection is not optimal.

When to See a Shop:

  • Immediately: A P20EE code, especially on a diesel, needs prompt attention. Ignoring it can lead to a vehicle derate (reduced power/speed) or even prevent the engine from starting after a certain number of cycles.
  • Dealership or Diesel Specialist: Given the complexity and cost of diesel emissions systems, it's highly recommended to take your Gladiator to a Jeep dealership or a reputable diesel specialist. They have the specific diagnostic equipment and expertise to accurately diagnose and repair SCR system issues.
  • Do not attempt to drive long distances with this warning, as it can escalate to more severe vehicle limitations.
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