OBD-II code · Powertrain (generic, extended)
P24B5 Particulate Matter Sensor Heater Control Circuit Low
Same as P24B3 with the control line shorted to ground. The sensor heater warms the element to operating temperature (~600 °C); without it the lambda sensor stays inactive in closed loop and the ECM cannot trim mixture.
Is it safe to drive with P24B5?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyControl line shorted to ground
- Less likelyConnector pins corroded - high contact resistance
- Less likelyHarness chafing through insulation
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–3 h
- Emissions test
- Likely to fail
- Parts involved
- Particulate Matter Sensor Heater
Related codes
- P24B2Particulate Matter Sensor Circuit Intermittent
- P24B3Particulate Matter Sensor Heater Control Circuit Open
- P24B4Particulate Matter Sensor Heater Control Circuit Range or Performance
- P24B6Particulate Matter Sensor Heater Control Circuit High
- P24B7Particulate Matter Sensor Heater Resistance
- P24B8EVAP System Leak Detection Pump Pressure Sensor Circuit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.