Mercedes-Benz C1015: Front Left Wheel Speed Sensor

Make: Mercedes-Benz
Code: C1015
System: Chassis
Severity: Warning

In short

Mercedes-Benz C1015 = Front Left Wheel Speed Sensor — No Signal. This code is defined for Mercedes-Benz.
CarCoding classifies this code as warning severity under chassis.
The database lists 3 possible causes; freeze frame and live data decide which one applies — work by measuring, not by replacing parts.

What does Mercedes-Benz C1015 mean?

The control unit stores a standard fault code when a measurement falls outside its expected range. C1015 corresponds to Front Left Wheel Speed Sensor — No Signal.

C1015 is a manufacturer-specific code: because its second digit is 1, it is defined by the manufacturer rather than by SAE/ISO. You will not find this code in a standard OBD-II list, and the same number can mean something completely different on another make.

CarCoding files this code under Chassis. Chassis codes rest on sensors that measure vehicle motion; a sensor losing its zero point or contradicting the others is the typical source of codes in this group. Standard codes in this group →

All Mercedes-Benz fault codes →

Vehicles supported in CarCoding: Mercedes-Benz models.

Possible causes

Possible causes the CarCoding database holds for Mercedes-Benz C1015:

Wheel speed sensor
Damaged tone ring
Wiring

The order is not a probability ranking or a diagnostic sequence. The same code can have different causes on different vehicles, so treat the list as a starting set to be narrowed down by measurement.

How is it diagnosed?

The sequence below is not specific to C1015; it applies to OBD-II fault code diagnosis in general. These are the steps that are most often skipped:

Read all the codes together. A single code is rarely the whole story; the other codes stored at the same time often point to the real cause.
Read the freeze frame. The rpm, engine load, coolant temperature and speed at the moment the code was stored tell you under what conditions the fault occurred. It is the single most valuable piece of data you have.
Identify which list the code is in. Confirmed (Mode 03), pending (Mode 07) and permanent (Mode 0A) codes are not the same thing. A code that appears only in the pending list means the fault has not been confirmed yet — most likely it is intermittent.
Look at live data. Deliberately recreate the condition from the freeze frame and watch the relevant sensor values in real time. If you can reproduce the fault, you no longer have to guess.
Clear and verify. After fixing the fault, clear the code (Mode 04), take a verification drive similar to the freeze frame conditions and read the pending codes again. An empty list means the fault is really gone.

The cost of clearing codes: Clearing also resets the emissions readiness monitors. Until those monitors return to “complete”, the vehicle may not pass an emissions test. So read and record the codes before clearing them.

Can you keep driving?

CarCoding classifies Mercedes-Benz C1015 as warning severity: it is not in the group that requires stopping immediately, but the fault will not clear itself. If you notice changed driving behaviour, loss of power, higher consumption or unusual noise, bring the diagnosis forward.

A stored code can also affect the emissions readiness monitors and the outcome of a roadworthiness test. How your vehicle behaves right now matters more than this general classification: if there is a red warning on the dashboard, do not keep driving.

Other Mercedes-Benz fault codes

Other manufacturer-specific codes for the same make:

All Mercedes-Benz fault codes →

Read Mercedes-Benz C1015 on your own vehicle

With an ELM327-based BLE OBD2 adapter, CarCoding reads confirmed, pending and permanent fault codes separately, pulls the freeze frame and explains every code in plain language. Clearing codes is done from the app as well. The app is free to download.

Download on the App Store Get it on Google Play

Some advanced features require an in-app purchase.

Frequently asked questions

What does Mercedes-Benz fault code C1015 mean?

Mercedes-Benz C1015 means “Front Left Wheel Speed Sensor — No Signal”. In the CarCoding database it sits in the Chassis group with warning severity. This code is manufacturer-specific; it does not appear in standard OBD-II code lists.

What are the possible causes of Mercedes-Benz C1015?

The CarCoding database lists the following possible causes for Mercedes-Benz C1015: Wheel speed sensor; Damaged tone ring; Wiring. This list is not a diagnostic order; measurement decides which one applies.

Can you drive with fault code Mercedes-Benz C1015?

Mercedes-Benz C1015 is in the warning severity class: it is not in the group that requires stopping immediately, but the fault will not clear itself. If you notice changed driving behaviour, loss of power or higher consumption, bring the diagnosis forward. Base the decision on how the vehicle behaves right now and on the freeze frame data.

Will clearing Mercedes-Benz C1015 fix it?

Clearing a code (OBD-II Mode 04) only resets the record in the control unit and the warning lamp; if the fault is still present the code returns once the verification cycle completes. Clearing also resets the emissions readiness monitors, so clearing codes before an emissions test can cause the vehicle to fail. The right order is: record the code and the freeze frame, fix the fault, clear the code, take a verification drive and read the pending codes again.

Data source: the CarCoding fault code database. Code definitions follow the SAE J2012 standard; manufacturers may use different wording for their own codes. Everything on this page is generated from the code-specific database records.

Disclaimer: This page offers general diagnostic guidance and does not replace an inspection by a qualified workshop. Any work carried out on the vehicle is your own responsibility.