Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
Your car's filter that cleans the air from the engine is clogged, making the car go slower to protect itself.
The diesel particulate filter (DPF) is clogged, causing the engine control module (ECM) to limit engine power to prevent damage.
The P246C code indicates that the ECM has detected a restriction in the diesel particulate filter (DPF) on bank 1. This restriction is significant enough that the ECM has activated a forced limited power mode to protect the engine and exhaust system. The DPF is designed to capture and store soot from the exhaust gas of a diesel engine, but if it becomes too clogged, it can lead to increased back pressure and reduced engine performance.
• Reduced engine power
• Check engine light on
• Increased fuel consumption
• Clogged diesel particulate filter (DPF)
• Faulty DPF pressure sensor
• Exhaust leaks before the DPF
DPF: Diesel Particulate Filter
ECM: Engine Control Module
• Check for other related codes
• Inspect the DPF for excessive soot buildup
• Test the DPF pressure sensor
• Perform a forced DPF regeneration
• Replace the DPF if necessary
• Repair any exhaust leaks
• OBD-II scanner
• Pressure gauge
• Mechanic's tools for exhaust work
$500 - $2000
Moderate
• Ford F-250
• Chevrolet Silverado
• Dodge Ram 2500
• Regularly drive at highway speeds to allow passive DPF regeneration
• Use high-quality diesel fuel
• Perform regular maintenance and inspections
Exhaust System Issue
• Avoid short trips that don't allow the engine to reach optimal temperature
• Consider using a fuel additive designed for DPF cleaning
DPF issues may be covered under emissions warranty, depending on the vehicle and mileage.
DPF-related codes have become more common with the increased use of diesel engines and stricter emissions regulations.
High – Continued driving with a restricted DPF can lead to severe engine damage.
Operating a vehicle with a clogged DPF can result in failing emissions tests and is illegal in some regions.
• Engine at operating temperature
• Vehicle driven under load
The DPF is located in the exhaust system, typically near the engine or under the vehicle.
Q: Can I drive with a P246C code?
A: It's not recommended to drive long distances with this code, as it can lead to engine damage.
Q: How often should the DPF be cleaned?
A: The DPF should be cleaned or regenerated as needed, typically every 100,000 miles, depending on driving conditions.
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