Having encountered an ABS malfunction lamp or a message about a failure of the braking system on the dashboard, car owners Nissan Often encounter error code C118c. This diagnostic Trouble Code indicates a critical problem in the anti-lock brake system control loop, most often associated with a faulty wheel speed sensor or its wiring. Ignoring such a signal can lead to loss of braking efficiency on slippery surfaces and the activation of the exchange rate stability system in emergency situations.
Code C118c usually detected by the electronic control unit (ECU) when it detects abnormal signals from the front left or right speed sensor, depending on the specific chassis. The problem can be either electrical (open circuit, short circuit, oxidation of contacts) or mechanical (damage to the thin ring gear on the hub or the sensor itself). Understanding the nature of this error allows the owner Nissan Qashqai or X-Trail do not spend money on replacing an expensive ABS module if the reason lies in a cheap consumable.
The essence of the error and the operation of the ABS system
The anti-lock brake system (ABS) continuously monitors the speed of rotation of each wheel, comparing this data to detect the start of locking. When you press the brake pedal, the speed sensors transmit impulses to the control unit. If one of the sensors stops sending a signal or transmits incorrect data, the system goes into emergency mode, turning off the ABS function and the indicator on the panel lights up.
Code C118c is specific in that it often indicates an open circuit or short circuit in the speed sensor circuit of a particular wheel. This does not always mean that the sensor itself is physically broken; The problem may be hidden in the wiring harness, which is protected from dirt and moisture, but over time frays or oxidizes. In some cases, the error occurs due to problems with the connection connector, where the contacts lose their grip.
The main reasons for the failure
When diagnosing an error C118c It is necessary to consider several likely scenarios, from the simplest to the most complex. Most often, the problem lies in the wheel speed sensor itself, which loses sensitivity over time or is damaged by external factors (stone impact, corrosion). Another common cause is a violation of the integrity of the wiring going from the sensor to the ABS control unit.
- 🔧 Damage or contamination of the wheel speed sensor (front or rear).
- 🔌 Oxidation or mechanical damage to the sensor connector.
- 💔 Open or short circuit in the wiring harness (sensor circuit).
- 🦠 Contamination of the hub gear with metal shavings or dirt.
- ⚙️ Failure of the ABS control module (less likely, but possible).
It is important to note that on cars Nissan with an all-wheel drive system, the error can also occur due to desynchronization of the front and rear differentials if their gear ratios do not match, but for code C118c this is a rare scenario. The main attention should be paid to the electrical part and the condition of the sensor itself.
⚠️ Attention: Do not try to reset error C118c without eliminating the physical cause of the failure. If the sensor or wiring is damaged, the error will return immediately after the first movement of the car, and in the worst case, the ABS system may not work correctly in a critical situation.
Diagnostics and troubleshooting
To accurately identify the cause of the error C118c A diagnostic scanner is required that can read data from the ABS module in real time. Simply clearing the error via the OBDII adapter will not work, since the system will write the code again the first time the parameters are checked. You need to connect to the diagnostic connector and look at the rotation values of each wheel.
If the scanner shows "0" or "no signal" on a specific wheel, the problem is localized. Start with a visual inspection: check the integrity of the wires going to the wheel and the condition of the connector. It often happens that the wire frays at the bend or under the influence of vibration, and the oxidized contacts in the connector create high resistance, which the ECU perceives as a break.
- 🛠️ Use a multimeter to check the resistance of the sensor (usually in the range of 1.0–2.5 kOhm).
- 🔦 Inspect the ring gear on the hub for chips, cracks or adhered dirt.
- 🔌 Check the integrity of the wire insulation along the entire length of the harness to the ABS connector.
If a visual inspection does not produce results, it is necessary to check the voltage at the connector with the ignition on. The absence of supply voltage will indicate a problem in the ABS unit power circuit or fuse. It is also worth paying attention to the condition of the hub bearing, as play can change the gap between the sensor and the ring, causing an intermittent signal.
- ABS light came on
- VDC icon lights up
- Brakes work fine
- Scan showed an error
⚠️ Attention: When checking the sensor with a multimeter, be sure to disconnect the connector from the sensor so as not to damage the device or control circuit. Measure the resistance between the contacts of the sensor itself.
Step-by-step instructions for troubleshooting
Troubleshooting C118c begins with replacing the speed sensor if its resistance is outside the normal range or it does not generate a signal. To do this, you need to dismantle the wheel, unscrew the sensor mount and carefully remove it. When installing a new element, make sure it fits snugly in the seat, as clearance is critical for proper operation.
☑️ Check before replacing the sensor
If the sensor is working and the problem persists, the wiring will need to be repaired. If a wire breaks, it must be stripped, twisted and carefully insulated, or better yet, a section of the harness must be replaced. If the problem is in the connector, it must be replaced or the contacts must be cleaned with a special cleaner. After carrying out the work, be sure to clear the errors with a scanner and conduct a test drive.
- 🚗 Accelerate the car to a speed of 20–30 km/h and check if the error disappears.
- 🔌 Make sure the ABS light does not come on when braking.
- 🛠️ Check the operation of the exchange rate control system (VDC) when turning the steering wheel sharply.
What should I do if the error is returned immediately?
If error C118c returns after replacing the sensor, check the gap between the sensor and the ring. Sometimes the cause is a broken seat in the hub, causing the sensor to become dislodged. It is also possible that the ring gear itself may be damaged and must be replaced along with the hub assembly.
In some cases, especially on used cars, the problem may be in the ABS module itself, where the internal electronics fail. However, this is rare and is usually accompanied by other error codes. For most cases, error C118c can be resolved by replacing an inexpensive speed sensor and restoring the integrity of the wiring.
Regular cleaning of contacts and checking the condition of wiring during scheduled maintenance will help prevent the occurrence of error C118c and ensure the reliability of the braking system.
Specifics on various Nissan models
Although it's a mistake C118c found on many models, there are nuances depending on the platform. On Nissan Qashqai and X-Trail (T31, T32) The problem is often associated with the front left sensors, as they are exposed to maximum dirt and salt from the road. On Nissan Note or Almera Rear sensors are more likely to suffer due to the design of the rear suspension and moisture accumulation.
By car Nissan Murano and Pathfinder With all-wheel drive, you should pay special attention to the rear axle, since the sensors there are more complex and difficult to access. In some cases, replacing the sensor requires removing part of the suspension components or brake caliper. Always use original spare parts or high-quality analogues, as cheap sensors may have the wrong signal frequency.
| Model | Common error location | Diagnostic features |
|---|---|---|
| Nissan Qashqai (J10/J11) | Front left sensor | Often oxidation of the connector in the arch |
| Nissan X-Trail (T31/T32) | Front and rear sensors | Requires caliper removal for access |
| Nissan Note (E11/E12) | Rear sensors | Problems with wiring in the tailgate corrugation |
| Nissan Murano (Z50/Z51) | All wheels | High gap sensitivity |
When replacing the speed sensor on all-wheel drive models, make sure you replace the sensors in pairs on the same axle to avoid signal desynchronization.
Prevention and Maintenance
To avoid the error reappearing C118c, the ABS system must be inspected regularly. Whenever you wash your car, pay attention to the cleanliness of the wheel arches and the condition of the wires. Timely replacement of worn connectors and cleaning of contacts from oxides will significantly extend the life of speed sensors.
If you operate your car in winter or off-road, it is recommended to periodically check the condition of the ring gears on the hubs. Dirt and metal shavings adhering to the magnetic part of the sensor can completely block the signal. Use special brake system and sensor cleaners that do not contain oil or grease.
⚠️ Attention: Do not use aggressive chemical solvents to clean speed sensors, which may damage the wire insulation or the plastic housing of the sensor. Use only specialized cleaners.
Remember that the ABS system is safety critical. Any signs of trouble, including a light coming on or strange noises when braking, require immediate diagnosis. Regular maintenance and the use of quality diagnostic equipment will help keep your braking system in good working order.
Questions and answers
Is it possible to drive with error code C118c?
You can drive, but the ABS and VDC systems will not work. Braking distances will increase, especially on slippery roads, and the wheels may lock during hard braking. It is recommended to correct the problem as soon as possible.
How much does it cost to replace a speed sensor on a Nissan?
The cost of the original sensor varies from 1,500 to 4,000 rubles, depending on the model. The replacement job is usually inexpensive as it is a simple procedure, but on some models the caliper may need to be removed.
Does resetting the error without repair help?
No. Error C118c is hard and will return during the first system check after the car starts moving. A reset makes sense only after eliminating the physical cause of the failure.
What multimeter is needed for testing?
Any digital multimeter with a resistance (ohms) measurement function will do. The measurement range should allow measuring values from 100 Ohm to 20 kOhm.
Could the error be due to bad gasoline?
No. Error C118c refers exclusively to the electrical part of the braking system and speed sensors. Fuel quality does not affect ABS operation.