Particulate Matter (PM) Sensor Signal Circuit Range/Performance Problem
There's an issue with the sensor that measures particulate matter.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The PM sensor is supposed to measure how much soot is in the exhaust. If the readings are too high or too low, it throws a code. This can happen if the sensor is faulty or if there's a problem with the exhaust system.
What the computer is actually seeing
The Engine Control Module (ECM) expects the particulate matter levels to fall within a specific range based on normal operation. If the PM sensor reports values that are inconsistent with expected levels, it triggers this code.
What a healthy reading looks like
PM readings should normally be around 0 to 500 μg/m³ in clean exhaust; values outside this range trigger the code.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check for any visible damage to the wiring and connectors of the PM sensor. Look for frays, corrosion, and loose connections.
- 22. Inspect the exhaust system for leaks before the sensor; ensure all joints are sealed and intact. Repair as needed.
- 33. Use a scan tool to check live data for PM sensor readings. Compare them with expected values.
- 44. If the readings are still out of range, test the PM sensor: disconnect it and measure resistance across its terminals (spec value in ohms under specs). Replace if necessary.
- 55. If the sensor tests good, check the DPF for blockages or contamination. Clean or replace as needed.
Common causes
- Faulty PM sensor
- Wiring issues or broken connectors related to the PM sensor
- Exhaust leaks before the PM sensor
- Contaminated DPF (Diesel Particulate Filter)
- Malfunctioning engine contributing to excessive soot
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable but may impact performance and emissions; fix soon.
Will this code come back after clearing it?
It can reappear if the underlying issue isn't resolved, like a faulty sensor or exhaust leak.
Why does this code sometimes pair with DPF issues?
The PM sensor directly measures soot levels; if the DPF is clogged, it will affect readings.
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