The pressure sensor A of the particulate filter, usually a differential sensor with hoses to the filter inlet and outlet, tells the ECM how loaded the filter is. Despite its generic circuit title, P2452 is in practice an offset check made when no exhaust flows. Ford's 2023 diesels run it in after-run and set the code when the sensor still reads more than 1 kPa. GM's 2018 diesels check the filter inlet pressure at the start of the drive cycle, after at least 10 s engine off, and set it as a Type B code when the offset is too big. A sensor that has drifted, moisture inside it or a hose holding pressure all give such an offset. Audi saw P2452 together with P2453, P2454, P2456 and P2002 on the 2009 to 2011 Q7 TDI and traced it to moisture entering the differential pressure sensor G505 through poor internal sealing; the fix was a sensor with better sealing. The soot model then works with wrong values, so regeneration timing suffers.
Medium severity. Can I keep driving?Drive in moderation to a repair shop and do not put it off: without regeneration, the DPF keeps filling up. If the filter warning light also appears or power drops, do not drive any farther than the trip to the repair shop.
Symptoms
- Malfunction indicator lamp on
- Regeneration too early, too late or inhibited
Most likely causes
- Sensor offset drifted or moisture inside the sensor
- Sensor hose blocked by soot or condensate
- Corroded connector or terminals
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: medium
- It affects emissions.
What each character of P2452 means
- P: Powertrain: engine and transmission
- 2: Generic code: same on every make
- 4: Emissions
- 52: Specific fault in that system
Frequently asked questions
Can I keep driving with code P2452?
Drive in moderation to a repair shop and do not put it off: without regeneration, the DPF keeps filling up. If the filter warning light also appears or power drops, do not drive any farther than the trip to the repair shop.
What causes code P2452?
The most common causes are: sensor offset drifted or moisture inside the sensor; sensor hose blocked by soot or condensate; corroded connector or terminals.
Related codes
- P2453Diesel Particulate Filter Pressure Sensor A Circuit Range/Performance
- P2454Diesel Particulate Filter Pressure Sensor A Circuit Low
- P2455Diesel Particulate Filter Pressure Sensor A Circuit High
- P2456Diesel Particulate Filter Pressure Sensor A Circuit Intermittent/Erratic
Sources
- fordservicecontent.com: obd summary diesel 2023
- gsi.ext.gm.com: 18OBDG04 Engine Diagnostics
- static.nhtsa.gov: SB 10065349 6903
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.