P244C: Exhaust Temperature Too Low For Particulate Filter Regeneration (Bank 1)

During an active regeneration the engine raises exhaust temperature with late injections so the soot in the particulate filter can burn. P244C is stored when bank 1 does not get hot enough or does not stay hot long enough. GM's diesel tables of 2017 and 2018 count interrupted regenerations: the burn ran past its maximum time, the post injections were not released in time or the steady heating phase was never reached; a successful burn clears the counter, and the code is Type A after one trip. VW's 2014 TDI cars flag it when closed-loop temperature control upstream of the turbine is not active within 45 s, or ahead of the filter within 60 s. Deutz lists it as a failed regeneration. The bank 2 twin is P244E; P244D covers too much heat. Soot keeps building, so P2463 or P2459 may follow.

Bank 1 is the side of the engine with cylinder 1. Inline engines only have this bank.

Symptoms

• Malfunction indicator lamp and particulate filter warning on
• Regenerations noticeably frequent or never finishing
• Reduced power once the filter is heavily loaded

Most likely causes

• Oxidation catalyst aged or face-plugged, so the post-injected fuel does not light off
• Regenerations repeatedly cut short by short trips, idling or engine shut-off
• Exhaust temperature sensor ahead of catalyst or filter reading too low
• Exhaust leak ahead of the catalyst cooling the gas

What to check, in order

Start with the simplest. You can tick off each step.

1. Read the soot load and differential pressure with a scanner
2. With the connector unplugged, check whether the signal wire is making contact with ground.
3. Check the differential pressure sensor's hoses
4. Check the temperatures before and after the filter
5. Fix any fuel injection or EGR codes before regenerating
6. Perform a regeneration while driving or at a repair shop when the diagnosis allows it

Good to know

• Repair difficulty: medium
• It can trigger limp mode.
• It affects emissions.

What each character of P244C means

• P: Powertrain: engine and transmission
• 2: Generic code: same on every make
• 4: Emissions
• 4C: Specific fault in that system

Frequently asked questions

Can I keep driving with code P244C?

If the light is on steadily, take a highway drive or go to a repair shop soon. If the car is in limp mode or the light is flashing, do not push the engine.

What causes code P244C?

The most common causes are: oxidation catalyst aged or face-plugged, so the post-injected fuel does not light off; regenerations repeatedly cut short by short trips, idling or engine shut-off; exhaust temperature sensor ahead of catalyst or filter reading too low.

Related codes

• P244DExhaust Temperature Too High For Particulate Filter Regeneration (Bank 1)
• P244EExhaust Temperature Too Low For Particulate Filter Regeneration (Bank 2)
• P2463Diesel Particulate Filter Restriction - Soot Accumulation (Bank 1)
• P2459Diesel Particulate Filter Regeneration Frequency
• P2458Diesel Particulate Filter Regeneration Duration
• P2080Exhaust Gas Temperature Sensor Circuit Range/Performance (Bank 1 Sensor 1)

Sources

• gsi.ext.gm.com: 17OBDG04 Engine Diagnostics
• static.nhtsa.gov: MC 10073689 2280
• serdia.deutz.com: DTCList EMRL1 MainECU EN
• law.cornell.edu: 13 CCR 1968.2

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.