P0318 Rough Road Sensor A Signal Circuit

P0318 – OBD-II Trouble Code Technical Description

Rough Road Sensor A Signal Circuit

What does the fault code mean P0318?

This Diagnostic Trouble Code (DTC) is common to OBD-II equipped vehicles such as VW, Ford, Audi, Buick, GM and others. Code P0318 is classified as an ignition system code. This code can occur when the sensor system and PCM (or powertrain control module) detect abnormal engine crankshaft movement, often associated with rough road conditions. Road sensors, accelerometers, or ABS wheel sensors with an electronic brake control module (EBCM) can help detect such situations.

Regardless of the system used, the P0318 code indicates that attention to rough road conditions is required. Typically this code is activated after several confirmation events. It may also be connected to the rough road sensor “A” circuit. Additional information about the P0318 code may vary depending on the vehicle manufacturer.

Possible reasons

Any time the PCM detects a sudden change in crankshaft position while driving on a rough or rough road, it may cause a DTC to be stored. The service engine light may turn on soon. It is important to note that some vehicles may require several fault cycles before the service engine light turns on. It's also possible that you have disabled, missing, or faulty rough road sensors or other bump-sensing devices.

Possible reasons for setting this code may include a faulty rough road sensor (if equipped), wiring or electrical problems with the sensors, or the control unit needing to initialize a new road sensor. There are other potential reasons that could cause this code.

What are the symptoms of a fault code? P0318?

Symptoms may include a stalled engine or hesitation, a stored trouble code, and an illuminated check engine light. The traction control system or anti-lock brake system may also be affected.

Engine light (or engine maintenance light) is on
Engine misfire
Most trouble codes cause the check engine light (or MIL) to come on. For this DTC P0318, the lamp does not come on. However, other warning lights (traction control, ABS, etc.) may come on, or the engine may misfire or run rough.

How to diagnose a fault code P0318?

To begin diagnosing, it is recommended to check for technical service bulletins (TSBs), which may be associated with your make, model, and year of vehicle. This can help you save time and resources. It is also a good idea to consult your specific vehicle's repair manual to determine which rough road system your vehicle has.

If you also have other error codes, such as misfire codes, ABS codes, or others related to these systems, it is recommended that you start by troubleshooting them before attempting to resolve the P0318 problem. In addition, it is important to record all data associated with stored error codes and events, as they may be useful for further diagnosis.

Next, perform a visual inspection of all components of the rough road sensor system, including sensors, connectors, and wiring. Damaged components, broken or damaged wires and connectors should be replaced or repaired.

If this does not resolve the problem, check the connectors for debris, dirt, and corrosion, and then replace or repair the harnesses, components, and connectors if they are in poor condition.

Using a digital voltmeter, check the ground and voltage signals at the sensor connector. If voltage and ground signals are present, recheck the sensor on rough road conditions. If the sensor does not produce a signal or its signal voltage does not change when conditions change, it is recommended to replace the sensor.

However, if you are unsure of your skills, an experienced technician with professional equipment and a specialized scanner will be able to more accurately identify the problem and recommend appropriate repairs. Diagnosing the P0318 code using a digital voltmeter can be a complex and costly procedure and is best left to a professional for a more reliable result.

Diagnostic errors

A common mistake when code P0318 occurs is to replace the wheel speed sensors, as well as the crankshaft and camshaft position sensors yourself. However, it is worth noting that such actions do not always solve the problem completely. Instead, it is recommended that you contact a professional technician equipped with the appropriate diagnostic equipment.

A professional will be able to conduct a more accurate diagnosis and get to the root of the problem, thereby avoiding unnecessary costs of replacing components that may not be in working order. In the end, this will not only save you money, but will also ensure more efficient troubleshooting and ensure the reliable operation of your vehicle.

How serious is the fault code? P0318?

Since this problem can affect the performance of the brakes, it should be treated with great seriousness. If you notice a P0318 code, it is highly recommended that you contact a professional auto mechanic to diagnose and resolve the problem. The need for prompt intervention or repairs makes this step important to ensure the safety of your vehicle and your ride on the road.

What repair will help eliminate the code? P0318?

The rough road sensor may need to be replaced, but a thorough inspection is necessary to accurately determine the problem. Code P0318 is best left to a professional technician who has the necessary equipment and experience to properly diagnose and resolve this issue.

What is P0318 Engine Code [Quick Guide]

P0318 – Brand-specific information

• P0318 Road sensor “A” signal circuit poor
• P0318 FORD Dirt Sensor Signal Circuit
• P0318 Volkswagen Unpaved Road Sensor “A” Signal Circuit

The P0318 code can be complex and require extensive scanning of multiple circuits to pinpoint the problem. Even experienced professionals may require significant time and effort to complete this complex task. Therefore, before starting work, it is important to conduct the necessary research and consider all possible options. Misdiagnosis can have serious consequences, including the need to reprogram the entire vehicle. If you are considering solving this problem yourself, do not hesitate to contact a professional for advice and tips on the best way to deal with the problem.