The Quick Answer above is the generic definition. What follows is the model-specific detail for the Mercedes-Benz models that log P24C6.
DTC/P24C6·Mercedes-Benz
P24C6 on Mercedes-Benz: Causes, Symptoms and Fix Cost
Quick Answer
Low SeveritySafe to drive (short-term)Mercedes-Benz
P24C6 on a Mercedes-Benz means the engine computer has found a fault in the temperature circuit of the particulate matter sensor, also called the soot sensor. This sensor sits in the exhaust after the diesel particulate filter and checks that the filter is still trapping soot. Before each measurement it heats itself to burn off collected soot, and it needs its own temperature reading to do that, so with this fault the sensor cannot work and the engine cannot confirm the filter is doing its job. The usual causes are a failed sensor or a wiring or connector fault; the particulate filter itself is usually fine.
Typical repair cost, all makes€30 - €620
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Mercedes-Benz C-Class diesel
2018-2021Diesel C-Class models of this generation use a soot particulate sensor in the exhaust after the particulate filter, and the same part is listed across several Mercedes diesel ranges. The probe, its lead and its control electronics are supplied as one assembly, so a temperature circuit fault inside it means replacing the whole part.
Mercedes-Benz GLC 220d / 250d
2017-2020The diesel GLC uses the same soot particulate sensor as the C-Class. It is reached from underneath by pulling back the plastic underbody shield, and it is the sensor nearer the front of the car, with the NOx sensor further back. An old one can take heat or force to remove, and a learning procedure with diagnostic software may be needed after fitting a new one.
What causes P24C6 on a Mercedes-Benz?
Beyond the generic causes listed on the main P24C6 page, these are the patterns noted for Mercedes-Benz models:
Mercedes-Benz C-Class dieselFailed soot particulate sensor
Mercedes-Benz C-Class dieselConnector or lead damage under the car
Mercedes-Benz GLC 220d / 250dFailed soot particulate sensor
Mercedes-Benz GLC 220d / 250dWater damage to the sensor after driving through deep water
How to diagnose P24C6 on a Mercedes-Benz with OBD2
Follow these steps to pinpoint the root cause of P24C6:
- Read all stored codes and the freeze frame with an OBD2 reader. Note any other particulate matter sensor codes and any particulate filter codes such as P2002, P2463 or P244B. A generic OBD2 reader shows the codes, the freeze frame and the readiness status, but not the sensor's internal readings; those need manufacturer-level software.
- Confirm that the part at fault is the particulate matter sensor after the filter, not the DPF pressure sensor or a NOx sensor. They can sit close together under the car and are different parts.
- Check the fuse for the sensor supply, then inspect the sensor lead and its control unit connector for water, corrosion, pushed-back pins and heat or impact damage along the exhaust.
- With manufacturer-level software, read the sensor's status and temperature values, and run its self-test if the software offers one. A temperature value that is missing or impossible with good wiring points to the sensor.
- Replace the sensor if the wiring and supply are good. On many cars the probe, its lead and its control electronics come as one part. An old sensor can be seized in the exhaust, so heat or penetrating oil may be needed.
- Run any learning procedure the engine computer asks for, clear the code and drive normally so the filter monitor can run again.
How much does P24C6 cost to fix on a Mercedes-Benz? (EUR)
Estimated repair costs for P24C6 in EUR, compiled across makes. Expect Mercedes-Benz parts and labour towards the upper end of each range.
Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.
Codes related to P24C6
These codes are often seen alongside P24C6 or point to related issues, on any make:
Looking for the full P24C6 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P24C6 guideSkanyx · Mercedes-Benz
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