P118B on 2015-2019 Opel Zafira (Zafira Tourer C) — Particulate Matter (PM) Sensor Temperature Not Plausible
1 vehicles · 1 makes · $200-$600 repair
Most Reported On
P118B is an OBD-II diagnostic trouble code meaning “Particulate Matter (PM) Sensor Temperature Not Plausible.” P118B is a GM manufacturer-specific code (Chevrolet, GMC, Cadillac diesels) indicating the engine control module detected an implausible temperature reading from the exhaust Particulate Matter (PM/soot) sensor located downstream of the diesel particulate filter (DPF). The PM sensor uses an internal heater and temperature element to monitor soot accumulating between its electrodes; when the reported temperature does not match expected exhaust conditions, the ECM cannot trust the sensor's soot measurement and sets this code, often illuminating the check engine light and disabling proper DPF/emissions monitoring. This code is most commonly reported on 2015-2019 Opel Zafira (Zafira Tourer C), with repair costs ranging from $200 to $600.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P118B, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
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A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
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BlueDriver Pro Bluetooth Scanner
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Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
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LAUNCH CRP123X OBD-II Scanner
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Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
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FAQ
What does P118B mean?
P118B stands for "Particulate Matter (PM) Sensor Temperature Not Plausible." P118B is a GM manufacturer-specific code (Chevrolet, GMC, Cadillac diesels) indicating the engine control module detected an implausible temperature reading from the exhaust Particulate Matter (PM/soot) sensor located downstream of the diesel particulate filter (DPF). The PM sensor uses an internal heater and temperature element to monitor soot accumulating between its electrodes; when the reported temperature does not match expected exhaust conditions, the ECM cannot trust the sensor's soot measurement and sets this code, often illuminating the check engine light and disabling proper DPF/emissions monitoring.
What are the most common causes of P118B?
The most common causes of P118B are: Faulty or aged exhaust particulate matter (PM) sensor, Open, shorted, or chafed wiring in the PM sensor harness, Poor electrical connection or corrosion at the PM sensor connector, Exhaust leak near the PM sensor altering measured temperature, Failed PM sensor internal heater or temperature element, ECM/sensor control unit software or calibration fault (less common). The specific cause varies by vehicle.
How much does it cost to fix P118B?
Repair costs for P118B range from $200 to $600, depending on the vehicle and root cause.
Which vehicles are affected by P118B?
Au7o has documented P118B across 1 vehicle models from 1 manufacturers: Opel.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.