2010 Dodge Diesel P226C and U0175 Code: Diagnosis and Fix for Aftermarket Modifications
I own a 2010 Dodge 2500 Diesel Laramie 4x4 automatic with 130,000 km. The truck has been modified with a turbo-back exhaust system, filter delete, cold air intake, EGR deletion, and an H&S chip. Despite these modifications, I'm consistently getting diagnostic trouble codes P226C and U0175 that won't clear. The vehicle runs smoothly—no performance issues—and I've noticed a 4 to 6 mpg improvement due to the setup, which should pay for itself in 5 to 8 months. However, the check engine light remains on. The P226C code sometimes returns after clearing via the H&S chip, and U0170 reappears shortly after I clear it manually. When I used to engage the exhaust brake, it helped suppress the codes—however, recently, the exhaust brake has started exhibiting a flutter or misfire during operation. It functions normally when towing heavy trailers. I've checked various forums, and many suggest replacing the turbocharger as a solution, but given that my truck runs fine and the turbo produces no issues (no whining or performance loss), I'm skeptical. The dealership would dismiss any modifications as non-standard. I'm seeking reliable technical guidance on diagnosing and resolving these persistent codes without costly repairs. Can anyone confirm whether P226C and U0175 are related to sensor faults, wiring issues, or aftermarket interference? What steps should I take to properly diagnose this issue?
I may need more specific details for a proper diagnosis. My 2010 Dodge 2500 Diesel Laramie 4x4 automatic has 130,000 km and features a cold air intake, EGR delete, H&S chip, and turbo-back exhaust. I drive approximately 400 km per day, which results in a 4 to 6 mpg improvement—paying for itself within 5 to 8 months. I consistently receive P226C and U0175 codes. The U0175 code returns immediately after clearing it via the H&S chip. P226C appears intermittently, not always returning right away. Previously, using the exhaust brake helped suppress these codes. However, now I notice a flutter or misfire during operation—especially when the brake is engaged under normal conditions. The exhaust brake works fine when towing heavy loads. The engine and turbo perform normally: no whining, no power loss, and smooth operation. The only issue is the persistent check engine light. Given that many forums suggest a new turbo as a fix, I'm wondering if this is truly necessary or if there's a more targeted diagnostic approach—such as sensor calibration, wiring faults, or ECU communication issues—especially with aftermarket modifications in place.