P24B0

Code

Generic P — Powertrain

Particulate Matter Sensor Circuit Low

Brand: Generic

Type: P — Powertrain

Views: UK: 24 EN: 97 RU: 42

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Scan for active and pending codes; record freeze frame and freeze data
Visually inspect sensor, connector, and wiring for damage, corrosion, or contamination
Check fuses and any relay providing power to the PM sensor circuit
Backprobe sensor connector to verify reference voltage, signal voltage, and ground at key ON and engine running
Measure heater resistance (if applicable) and compare to spec; check for open or short
Perform continuity and short-to-ground/power tests on signal and ground circuits between sensor and ECM

Typical PM sensor signal range: 0–5.0 V (varies by manufacturer); a low-circuit fault often registers
Reference/supply voltage commonly ~5.0 V for the sensor electronics and ~12 V for any internal heater (verify vehicle-specific specs)
Heater resistance (if present) often in low-ohm range (example 5–100 Ω depending on sensor). Compare to manufacturer specification
No communication interruptions on the sensor harness; continuity should be close to 0 Ω on ground and signal conductors (vehicle-specific limits apply)

Retrieve and record all DTCs, freeze frame, and live data for PM sensor output and related DPF parameters.
Perform a visual inspection of the PM sensor, connector, and harness for damage, corrosion, soot build-up, or water intrusion.
Check fuses and power/ground at the sensor connector. Repair any blown fuses or poor grounds before continuing.
With connector connected, backprobe and measure: reference voltage (usually ~5 V) at key ON, signal voltage at key ON and while engine running, and ground integrity. Compare to expected ranges.
Disconnect sensor and measure internal heater resistance and sensor element resistance (if specified). Check for shorts to ground/power on signal and heater circuits.
Perform continuity checks from the sensor connector pins to the ECM connector pins to find opens or high resistance. 7) Wiggle test harness while monitoring live signal for intermittent faults. Repair any damaged wiring or connectors.
If wiring and supply are within specification but signal remains low, replace the PM sensor with a correct OEM or approved part.
After repair or replacement, clear codes and perform a drive cycle or forced DPF regeneration (if required) to verify the fault does not return. Re-scan and confirm normal sensor parameters.
If fault persists after sensor replacement and wiring verified, consult manufacturer technical service documentation and consider ECM testing or replacement.