P24B5Particulate Matter Sensor Heater Control Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P24B5 points to the heater line of the particulate matter sensor being pulled toward ground, so the heater control sees an implausible current while heating is requested. GM's 18OBDG04 table describes it as a ground fault on the heater line and flags it when current is under 0.5 A or above 15 A with the heater commanded on, 30 of 60 samples, Type B with two trips. VW's 2014 Touareg list uses a heater current below 1 A or above 15 A. GM issued PIP5607 for 2019 Silverado and Sierra 2500/3500 with the 6.6L L5P, telling technicians to clear P24B3 or P24B5 because engineering suspected false setting. While the heater cannot work, the sensor cannot clean itself and the filter monitor stops. P24B3 is the open circuit, P24B6 the short to power.
- What you may notice
- Malfunction indicator lamp on
- Particulate filter monitor does not complete
- Likely causes
- LikelyHeater line shorted to ground
- PossibleInternal heater fault in the sensor
- RareFalse detection by the control software
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €100 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.