P200C–P200D Particulate Filter Over Temperature Bank 1

Which code is which

Same fault, different cylinder or bank — diagnosed the same way. Several set together usually means one shared cause.

The definition

P200C: Particulate Filter Over Temperature Bank 1.

P200C is a manufacturer-specific powertrain code (the engine or gearbox). Its meaning is set by the carmaker rather than by the SAE standard, so a generic OBD-II reader will often show it as an unknown code or misread it.

What to check first

Cheapest and fastest checks first:

1. Read the freeze-frame data stored with the fault - engine speed, load and temperature at the moment it logged tell you whether this happens cold, hot or under load.
2. Check the connector at the part for corrosion, and that it is fully seated.
3. Clear the code and see whether it returns, and under what conditions.

What actually causes this on a VAG

This is the engine ECU saying the temperature at the particulate filter has gone above what it considers safe - the DPF on a diesel, or the GPF now fitted to a lot of petrol engines. It nearly always happens during a regeneration, the deliberate burn-off that clears soot from the filter, or shortly afterwards. Genuinely excessive heat can damage the filter's internal substrate, so this is one to act on rather than clear and forget. Confirm the code first, though. P200C does not appear in VAG's own fault list. What VAG records for exhaust over-temperature is P2428 and P2429, "Exhaust Gas Temperature Too High" for bank 1 and bank 2. If a basic reader gave you P200C, have the car read again with a VAG-capable tool and work from the code and the freeze-frame data the car actually stored.

Most likely causes, in order

1. A heavily loaded filter burning off all at once. Lots of short, cold journeys leave regenerations unfinished, so soot builds up; when a full regeneration finally runs there is far more to burn than usual and temperatures run away. Think about what the car has been doing. A VAG-capable tool shows soot loading and the distance and time since the last successful regeneration, which usually tells the whole story on its own, and VAG's own fault list carries related codes worth looking for alongside - P2458 regeneration duration, P2459 regeneration frequency and P2463 soot accumulation.
2. Exhaust gas temperature sensor reading wrong. The ECU may be reacting to a bad number rather than to real heat. With the car left overnight and stone cold, all the exhaust temperature sensors should read roughly the same as the outside air; one that is wildly out is the suspect. Sensors can also drift only once hot, so if the cold check passes, the readings are still worth comparing against each other during a drive. This test costs nothing and it is the quickest way to find out whether the heat was ever real.
3. Over-fuelling from a worn or leaking injector. Regeneration works by putting extra fuel into the exhaust, and an injector that dribbles adds more heat than the ECU planned for. Injector correction and return-quantity values, and any fuelling or misfire codes stored alongside this one, point this way. This is worth checking before the filter itself is touched, because a filter fitted to a car that is still over-fuelling will simply cook again.
4. A blocked, damaged or non-original filter. A filter part-blocked with ash, or a cheap replacement whose internals differ from the original, holds heat instead of letting it through. Worth raising if the filter has been replaced at some point, or if the car has covered a very high mileage on the original. VAG's own fault list has a specific code for this, P242F, ash accumulation, which is a different thing from soot and cannot be burned off.

Worth knowing: If the car goes into a regeneration, which usually shows as a raised or slightly rougher idle, a hot smell and the cooling fan running on after you stop, let it finish rather than switching off part-way. Repeatedly interrupted regenerations are exactly what create the overloaded filter that then overheats, so the driving habit is often the actual repair. And with a filter known to be running hot, do not park over long dry grass while the exhaust cools.

Common questions

What does P200C mean?

P200C means Particulate Filter Over Temperature Bank 1. It is logged when the ECU sees this circuit outside its expected operating window.

Can I drive with P200C?

The engine light will stay on and the car may run in a reduced-power mode. Read the freeze-frame data to see the conditions the fault was logged under.

Related reading

• DPF regeneration on a VAG diesel: what it is and what blocks it
• 2.0 TDI EA288 problems: the owner's and buyer's guide
• 2.0 TDI EA189 Common Rail: Problems, Checks, Buying Advice
• White, Blue or Black Exhaust Smoke: What Each Colour Means
• Why the same fault code has completely different causes