What it means
The PM sensor supply voltage is below the plausible range. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
The particulate matter (PM) sensor monitors soot in the exhaust aftertreatment system, and its supply circuit provides the power it needs. This code sets when the module detects supply voltage below the plausible range, which can prevent reliable PM readings.
Common causes
Most likely first.
- Supply voltage low
- Connector pins corroded - high contact resistance
- Harness chafing through insulation
Symptoms
- Check-engine light on
- Particulate matter sensor or aftertreatment warning
- Emissions inspection failure
How to diagnose it
- Review freeze-frame data and PM-sensor supply readings to confirm when the low-voltage fault occurred.
- Inspect the PM sensor connector and nearby wiring for corrosion, water intrusion, loose pins, or chafing.
- Check the sensor supply fuse and related power feed for an open or poor connection.
- Measure supply voltage at the sensor connector and compare it with the manufacturer's specification.
- Check the supply wire for excessive resistance or a short to ground, then test the circuit under load if the wiring passes.
Common fixes
- Clean and secure a corroded or loose PM-sensor connector.
- Repair chafed wiring or a poor supply connection.
- Replace a failed fuse after identifying and correcting the cause.
- Replace the PM sensor only if its supply circuit is within specification and the sensor itself is faulty.
Can I keep driving?
Driving is often possible, but the PM sensor warning and emissions fault may remain, and the vehicle may fail an emissions inspection. Limit unnecessary driving if an aftertreatment warning escalates or engine performance changes.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.