AutoCodes – Generic – P1318

P1318 Code - ABS Rough Road Signal Line Stuck At Battery Volts

Quick Answer

The Anti-Lock Brake System (ABS) uses all-wheel speed sensors to determine if the vehicle is on a traveled surface likely to cause a false misfire detection. Common causes include Faulty ABS Speed Sensor, ABS Speed Sensor harness is open or shorted, ABS Speed Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1318 indicates ABS Rough Road Signal Line Stuck At Battery Volts.
Common causes: Common causes include Faulty ABS Speed Sensor, ABS Speed Sensor harness is open or shorted, ABS Speed Sensor circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 9,375

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 18, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1318 Description

The Anti-Lock Brake System (ABS) uses all-wheel speed sensors to determine if the vehicle is on a traveled surface likely to cause a false misfire detection. The Engine Control Module (ECM) will disable misfire detection when the traveled surface is considered rough enough to create a misfire signal that could set a false Diagnostic Trouble Code (DTC).

OBDII Code P1318 - ABS Rough Road Signal Line Stuck At Battery Volts - AutoCodes.com — P1318 Code - ABS Rough Road Signal Line Stuck At Battery Volts

What does this mean?

What are the Possible Causes of the DTC P1318?

Faulty ABS Speed Sensor
ABS Speed Sensor harness is open or shorted
ABS Speed Sensor circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P1318?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1318 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1318 code?

Need more information on how to fix the P1318 code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific Makes

P1318 Acura — Spark Plug Voltage Detection Module Reset Circuit Malfunction Front Bank 2
P1318 Hyundai — Ignition Coil 3 Low Output
P1318 Land Rover — ABS Rough Road Signal Line Stuck At Battery Volts

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.