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2017 Canyon Duramax - Reduced Engine Power & DPF Issues (P2002)

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Emily N. · rep 0 · May 22, 3:39 AM · 1 replies · solved · Question

Vehicle: 2017 GMC Canyon SLT Duramax

Hey guys, I'm having a persistent problem with my 2017 GMC Canyon SLT with the 2.8L Duramax diesel engine. The 'Reduced Engine Power' message keeps popping up on my dash, and the truck feels sluggish and lacks power. It's really frustrating, especially when trying to accelerate onto the highway.

The check engine light is also on, and when I scanned it, I got a P2002 code, which points to Diesel Particulate Filter (DPF) efficiency below threshold. I do a mix of city and highway driving, but I try to get it on the highway regularly for DPF regeneration.

Has anyone else dealt with this P2002 code or reduced power mode on their Duramax Canyon? What was the fix? I'm worried about the cost of replacing the DPF.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:39 AM

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ClearTheCode admin answer:

The P2002 code on your 2017 GMC Canyon Duramax indicates that the Diesel Particulate Filter (DPF) is not performing efficiently, often due to excessive soot loading or a blockage. The 'Reduced Engine Power' mode is a protective measure by the engine control unit (ECU) to prevent further damage.

  1. Common Causes for P2002:

    • Clogged DPF: This is the most common cause. If regeneration cycles are not completing successfully, or if there's an underlying issue causing excessive soot production, the DPF can become overly clogged.
    • Faulty DPF Pressure Sensors: The DPF system relies on pressure sensors to monitor soot levels. If these sensors are faulty, they can send incorrect readings to the ECU, triggering the code even if the DPF isn't fully clogged.
    • Exhaust Gas Temperature (EGT) Sensors: Malfunctioning EGT sensors can prevent proper regeneration cycles from initiating or completing.
    • EGR System Issues: A problem with the Exhaust Gas Recirculation (EGR) system can lead to increased soot production, overwhelming the DPF.
    • Short Driving Cycles: While you mentioned highway driving, consistent short trips without reaching full operating temperature can hinder passive and active regeneration.

  2. Initial Diagnostic Steps:

    • Forced Regeneration: A professional scan tool can often initiate a forced DPF regeneration. This can sometimes clear a moderately clogged DPF and reset the system. This should be done by a qualified technician.
    • Check for Leaks: Inspect the exhaust system for any leaks before or after the DPF, as this can affect pressure readings.
    • Sensor Check: A technician can monitor the DPF pressure sensor readings and EGT sensor readings to ensure they are within specification.

  3. When to See a Shop:

    • It's critical to have your Canyon diagnosed by a dealership or a diesel specialist. They have the specific diagnostic tools to properly assess the DPF system, including checking sensor functionality, performing forced regenerations, and evaluating the DPF's condition. Ignoring a P2002 code can lead to a completely blocked DPF, which may require expensive replacement. In some cases, a DPF cleaning service might be an option before full replacement, but this should be evaluated by a professional.
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