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Home / DTC / P2452 — Diesel Particulate Filter Pressure Sensor A Circuit

P2452 — Diesel Particulate Filter Pressure Sensor A Circuit

Detailed page for trouble code P2452.

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P2452

LAND ROVER P — Powertrain

Diesel Particulate Filter Pressure Sensor A Circuit

Brand: LAND ROVER
Type: P — Powertrain
Views: UK: 7 EN: 12 RU: 29
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Page language: EN

Causes

  • Open or short in DPF pressure sensor wiring (A circuit)
  • Corroded, loose or contaminated sensor connector
  • Failed DPF pressure sensor (internal fault)
  • Blocked or restricted DPF, clogged soot trap or plugged exhaust
  • Damaged or collapsed pressure/vacuum hoses or ports to the sensor
  • Water/soot ingress into sensor or harness

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • DPF or emissions warning message on dash
  • Reduced engine power or limp-home mode (in some models)
  • Difficulty completing automatic or forced regeneration, frequent regens
  • Poor fuel economy and increased exhaust smoke
  • DPF-related fault codes stored

What to check

  • Read and record freeze frame and all stored/active DTCs with a diagnostic scanner
  • Inspect sensor connector and wiring for damage, corrosion, or water ingress
  • Visually inspect DPF pressure hoses/ports for kinks, restriction or disconnection
  • Monitor live data: DPF differential pressure sensor voltage and calculated pressure
  • Backprobe sensor connector and measure reference voltage, signal voltage and ground
  • Perform continuity and short-to-ground/power checks on the harness

Signal parameters

  • Sensor typically uses an ECU reference supply (approx. 5 V) and a ground; signal output is a varying voltage proportional to pressure
  • Expected signal range (typical): approximately 0.5–4.5 V depending on pressure (manufacturer specifics vary)
  • Low-circuit symptom: signal stuck near 0–0.3 V or sudden drop to near 0 V
  • High-circuit symptom: signal stuck near supply (around 4.7–5 V) or constant max value
  • Normal behavior: small pressure/low voltage at idle, higher voltage/pressure under load or when DPF is restricted

Diagnostic algorithm

  1. Connect a diagnostic scanner, read and note all DTCs and freeze frame data; clear the code and attempt to reproduce.
  2. Visually inspect the DPF pressure sensor, connector, and sensing hoses for damage, contamination or disconnection.
  3. With ignition ON (engine off), backprobe the sensor connector: verify reference voltage (approx. 5 V), good ground continuity, and measure signal voltage. Compare to expected ranges.
  4. Start the engine and monitor live sensor voltage/pressure. Observe changes during idle, blips of throttle, and during a forced regen if safe. Look for erratic or no change.
  5. If signal is absent or out-of-range, perform harness continuity checks from the sensor connector to the ECU pins. Check for short to power or ground.
  6. Inspect and test sensing hoses/ports for blockage; remove and clean ports and hoses if contaminated. Replace damaged hoses.
  7. If wiring and hoses check good but signal is still bad, substitute a known-good pressure sensor (or bench-test the sensor if possible).
  8. If new sensor fixes the issue, reinstall and clear codes; run vehicle to confirm. If fault persists with known-good sensor, suspect ECU or intermittent wiring; perform further ECU and wiring diagnostics.
  9. If DPF restriction is present, address DPF condition (soot loading, ash, or physical blockage) per manufacturer procedures before replacing sensors.
  10. After repair, confirm proper regeneration behavior and that the code does not return during a driving/regeneration cycle.

Likely causes

  • Failed or intermittent DPF pressure sensor
  • Damaged connector or wiring (open, short to ground or 5 V)
  • Blocked DPF causing abnormal pressure that trips sensor limits
  • Collapsed or disconnected sensing hose between DPF and sensor

Fault status

⚠️ Status
DPF Pressure Sensor A Circuit — electrical fault detected in the DPF differential pressure sensor circuit. May cause incorrect DPF monitoring/regeneration and trigger MIL/emissions warnings.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

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