Code
DF1195
RENAULT
D
-> P047A - Circuit Capt. * Relative pressure particulate filter
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EN: 3
RU: 0
AI status
Completed
Completed
100%
Causes
- Faulty DPF differential/relative pressure sensor
- Damaged or corroded connector or wiring (open, short to power/ground, high resistance)
- Blocked, crushed or disconnected pressure/measurement hoses
- Excessive soot or severe restriction in the DPF
- Intermittent connector contact or water ingress
- Faulty ECU (rare)
Symptoms
- Malfunction Indicator Lamp (MIL) / check engine light illuminated
- Loss of power or reduced engine performance/limp mode (if ECU limits power)
- Failed or inhibited DPF regeneration
- Excessive smoke from exhaust (if DPF compromised)
- Possible increased fuel consumption or driveability issues
What to check
- Read and record freeze frame and all stored codes with an OEM-capable scanner
- Check live data: differential/relative pressure sensor value at key conditions (idle, load, during regeneration)
- Inspect sensor connector and wiring for corrosion, damage, looseness or water ingress
- Inspect pressure hoses/tubes between the DPF and sensor for kinks, disconnections, blockages or deterioration
- Measure sensor supply voltage and ground at the connector (reference typically ≈5V supply and dedicated ground)
- Measure sensor output with a multimeter or scope — compare to expected range and behavior while revving engine or during forced regen
Signal parameters
- Sensor output typically proportional to differential pressure; common electrical ranges: 0.5–4.5 V (check OEM spec)
- Relative pressure measurement range typically 0–200 mbar (0–20 kPa) depending on sensor — verify manufacturer values
- Reference/supply voltage to sensor commonly 5 V (verify on vehicle)
- Expected behavior: low pressure at idle/light load, rising pressure with engine load or when DPF is loaded; signal should change smoothly without jumps
Diagnostic algorithm
- Capture freeze-frame data and all related fault codes. Confirm code is current and not intermittent.
- Perform visual inspection of sensor, harness, connector and pressure hoses for obvious damage, contamination or disconnection.
- With key on (engine off), measure sensor supply/reference voltage and ground at connector. Replace wiring/repair ground if supply is missing or unstable.
- Measure sensor output voltage while varying engine speed/ load or during a commanded regen. Compare to manufacturer expected values and look for sudden jumps, stuck reading or out-of-range values.
- Disconnect sensor and check for short to power/ground on the harness using an ohmmeter. Repair any short or open circuits.
- Check pressure hoses for restriction or leakage. Replace collapsed or blocked hoses and ensure correct routing and secure fittings.
- If harness and sensor wiring are good but output remains implausible, replace the pressure sensor and re-test.
- If sensor replacement and wiring repair do not clear the code, inspect DPF backpressure. Perform DPF diagnostic (soot load measurement or back-pressure test) and perform forced regeneration or DPF cleaning/replacement if heavily restricted.
- Clear codes and perform road test / forced regen. Monitor sensor behavior and confirm no return of the code. If code returns and all vehicle-side checks are correct, consider ECU diagnosis.
- Document repairs and test results.
Likely causes
- Failed pressure sensor
- Damaged wiring or poor ground at sensor connector
- Clogged DPF causing abnormal pressure readings
Fault status
Status
P047A — Relative pressure particulate filter (DPF) sensor circuit: signal out of range/implausible.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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