P246C

Particulate Filter Restriction - Forced Limited Power Bank 1

Q: Is it safe to drive with P246C?

Only gently and only to get it repaired. The vehicle is already in reduced power to protect the filter; continued hard driving can push the DPF past cleaning and into replacement.

Q: Can I just clear P246C?

No. The filter is physically restricted. Clearing the code won't remove the soot — it returns immediately until a successful regen or filter service is done.

Diesel particulate filter Generic OBD-II High

What it means

P246C means the diesel particulate filter is so restricted with soot that the ECU has forced the engine into limited (reduced) power to protect it. It's the serious end of the DPF codes: the filter needs a successful regeneration or a service clean before it saturates with ash and requires replacement.

High

Can I keep driving? The ECU has already cut power to protect a badly clogged filter. Drive gently to a shop soon — ignoring it risks a very expensive DPF replacement.

Real-world scan data

Seen in

263

scans in the past year

Found in

<0.1%

of scans

0.1%

of scans that found faults

Appears alongside · share of P246C scans

P2463in 89.7% of scans

P24A4in 20.9% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Noticeable loss of power / limp mode
Check-engine light on, often with a DPF warning light
Repeated or failed regeneration attempts
Higher fuel use and exhaust smell

Common causes

Most likely first

Diesel particulate filter heavily loaded with soot from short-trip or low-speed drivingLikely
Regeneration repeatedly aborted or never completingCommon
Faulty DPF pressure or exhaust-gas-temperature sensor misreading filter loadCommon
Fuel injector, EGR, or turbo fault raising soot outputLess often
Physically damaged or ash-saturated DPF near end of lifeLess often

How to diagnose & fix

Work through it in order

Scan for companion codes (P2002, P2458, P2459, P2463) and check freeze-frame for what triggered the restriction.
Verify the DPF differential-pressure and EGT sensors read correctly before assuming the filter is bad.
Attempt a scan-tool forced regeneration if soot load is within limits; otherwise a service regen is needed.
Address any soot source — leaking injectors, EGR faults, boost leaks — so it doesn't reclog.
If soot/ash load is too high to burn off, clean or replace the filter, then reset the load counters and re-test.

FAQ

Quick answers

Is it safe to drive with P246C?+

Only gently and only to get it repaired. The vehicle is already in reduced power to protect the filter; continued hard driving can push the DPF past cleaning and into replacement.

Can I just clear P246C?+

No. The filter is physically restricted. Clearing the code won't remove the soot — it returns immediately until a successful regen or filter service is done.

Read & clear P246C yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX