Code
DF1252
RENAULT
D
-> P1632 - particulate filter circuit solenoid injector
Views:
UK: 1
EN: 6
RU: 1
AI status
Completed
Completed
100%
Causes
- Open or short in solenoid coil wiring (harness damage, chafing, corrosion)
- Poor connector connection (corroded pins, water ingress, loose terminals)
- Failed solenoid injector (coil open/short or mechanical seizure)
- Faulty power supply (blown fuse, relay, or ECU output fault)
- Poor or missing ground at solenoid circuit
- Intermittent ECU driver/module fault or software error
Symptoms
- MIL / check engine lamp illuminated
- Failed or no DPF regeneration
- Increased soot load and possible DPF over‑restriction codes
- Reduced engine performance or limp-home mode during/after regen attempts
- Possible stored secondary codes related to DPF or exhaust sensors
What to check
- Read and record all stored codes and freeze-frame data with a capable scanner
- Visual inspection of solenoid, connector and wiring for damage, corrosion or water ingress
- Check supply fuse(s) and relay(s) for the DPF/solenoid circuit
- Backprobe connector while commanding solenoid: verify presence of battery voltage and a switched/grounded control signal
- Measure solenoid coil resistance with the connector disconnected
- Check continuity between solenoid connector and ECU pins and verify good ground
Signal parameters
- Supply voltage: ~12 V (battery) present at solenoid supply pin when ignition on or when commanded
- Control signal: switched ground or PWM from ECU (0–12 V range depending on driver type) when commanded for regeneration
- Typical coil resistance: commonly between ~10–40 Ω for similar solenoids (refer to manufacturer data for exact value)
- Activation current: typically a few hundred milliamps to ~1–2 A depending on coil and PWM; monitor with scope or current clamp if available
- When inactive: coil circuit should show stable resistance and no intermittent open/short
Diagnostic algorithm
- Connect diagnostic tool, read fault DF1252 and any related codes; note freeze-frame and engine conditions.
- Perform visual inspection of the solenoid, connector and harness for damage, corrosion or water ingress; repair any obvious issues.
- With ignition off, disconnect solenoid connector and measure coil resistance. Compare with manufacturer spec; replace solenoid if out of spec (open or short).
- Check supply fuse(s) and relay(s) for the circuit; replace if faulty.
- With connector back on, backprobe supply and control pins. Verify battery voltage present on supply pin and proper switching on control pin while commanding solenoid from the diagnostic tool (look for ground switching or PWM).
- Check continuity and insulation between solenoid connector and ECU connector; repair any high resistance or short to ground/other circuits.
- If electrical path and solenoid test OK but still fault: perform an oscilloscope trace on control line during activation to confirm proper driver waveform; compare to expected behavior.
- If wiring and solenoid are good but driver waveform is absent or abnormal, suspect ECU/driver module fault—verify with manufacturer guidance before ECU replacement.
- After repairs, clear codes, carry out required DPF regeneration cycle or test procedure and confirm code does not return and that regeneration completes normally.
Likely causes
- Corroded/loose connector at the DPF solenoid injector
- Broken wire or damaged insulation in the harness between the solenoid and ECU
- Solenoid coil failed (open circuit or shorted)
- Supply fuse or relay for DPF control circuit blown or intermittent
- ECU driver transistor degraded (less likely but possible)
Fault status
Status
DF1252 — Particulate filter circuit solenoid injector: electrical/functional fault detected. Check solenoid, wiring, connectors, fuses/relays and ECU driver.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email