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Home / DTC / P24C8 — Particulate Matter Sensor Temperature Circuit Low

P24C8 — Particulate Matter Sensor Temperature Circuit Low

Detailed page for trouble code P24C8.

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P24C8

Generic P — Powertrain

Particulate Matter Sensor Temperature Circuit Low

Brand: Generic
Type: P — Powertrain
Views: UK: 19 EN: 48 RU: 27
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Page language: EN

Causes

  • Open or short in the PM sensor temperature wiring (short to ground)
  • Corroded, loose or damaged connector at the PM sensor
  • Failed particulate matter sensor (internal temperature element shorted)
  • Blown fuse or loss of reference power or ground to the sensor circuit
  • Faulty PCM/ECM or poor PCM ground
  • Water/contamination or mechanical damage to the sensor

Symptoms

  • Malfunction indicator lamp (MIL) or diesel service light illuminated
  • DPF regeneration inhibited or limited; possible reduced engine power or limp-home behavior
  • Stored or pending DPF/soot-related codes
  • Possible trouble starting in cold conditions (if system relies on temp input)
  • No obvious engine noise changes—problem is typically electrical rather than mechanical

What to check

  • Read freeze frame and freeze data; capture live PID for PM sensor temperature and related signals
  • Confirm other DPF/PM codes present (pressure sensor, regeneration faults)
  • Perform visual inspection of sensor, connector and wiring for damage, corrosion, contamination or loose pins
  • Backprobe sensor connector and measure reference voltage, sensor signal and ground with a multimeter or scope
  • Check for continuity to PCM and for short to ground on the signal circuit
  • Verify fuses and PCM grounds relevant to the PM sensor circuit

Signal parameters

  • Typical sensor signal voltage expected range: ~0.5–4.5 V (varies by manufacturer); fault flagged when signal is below expected low threshold (often
  • Reference supply (if present) commonly 5 V or switched ignition supply—verify nominal value at connector
  • Temp sensor resistance (NTC style) will change with temperature; measure resistance at ambient and compare to spec
  • Heater circuit (if integrated) should show correct supply voltage (~12 V when commanded) and expected current draw per spec

Diagnostic algorithm

  1. Retrieve all stored codes and freeze frame data. Note conditions when fault set (engine temp, ignition status).
  2. Visually inspect sensor, connector and harness from sensor to PCM for damage, corrosion or fluid intrusion. Repair any obvious issues.
  3. With ignition ON (engine OFF), backprobe connector: confirm reference supply voltage and ground continuity to PCM. Record values.
  4. Measure sensor output voltage with ignition ON and at operating temperature (if safe). Compare to expected range. A reading
  5. Check continuity of signal wire to PCM and check for short-to-ground. Repair wiring faults as needed.
  6. Measure sensor resistance (if service manual gives values) at ambient. Replace sensor if resistance is out of expected range or shows short.
  7. Inspect and test any sensor heater circuit: verify supply, ground switching and current draw when commanded by the PCM.
  8. If wiring and connector are good and sensor tests out-of-spec, replace the particulate matter sensor and clear codes. Retest under drive conditions.
  9. If fault persists after sensor replacement, suspect PCM/module fault — perform manufacturer diagnostics for module output/input testing before replacing.

Likely causes

  • Damaged wiring harness (abrasion, pinched, rodent damage) causing low voltage or short to ground
  • Corroded connector terminals at the PM sensor
  • Internal failure of the PM sensor temperature element (shorted thermistor)
  • Lost sensor ground or reference from PCM
  • Intermittent connection causing low/erratic readings

Fault status

⚠️ Status
PCM detected abnormally low signal from particulate matter sensor temperature circuit (low voltage/low resistance). DTC P24C8 set. Possible wiring short to ground, sensor failure, or lost reference/ground; DPF regeneration or related controls may be affected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P24C7 P0112 P0113 P2463
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