Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer is having trouble understanding signals from a sensor that helps it know if the road is bumpy. It's like when your game controller isn't working right, so the game can't tell if you're moving left or right.
The P0318 code is triggered when the Engine Control Module (ECM) detects an issue with the signal from the rough road sensor, which is used to detect road conditions and adjust vehicle systems accordingly.
The rough road sensor is part of the vehicle's suspension system and helps the ECM determine if the vehicle is on a rough surface. This sensor's signal is used to adjust various systems like traction control and ABS. A fault in this circuit can lead to improper system adjustments.
• Check Engine Light illuminated
• Traction control or ABS warning lights
• Inconsistent vehicle handling on rough roads
• Faulty rough road sensor
• Damaged wiring or connectors
• Faulty ECM
ECM: Engine Control Module
ABS: Anti-lock Braking System
• Connect a diagnostic scanner to check for error codes.
• Inspect the rough road sensor and its wiring for damage.
• Test the sensor's signal with a multimeter.
• Replace the rough road sensor if faulty.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Wrench set
$100 - $500
Moderate
• Chevrolet Silverado
• GMC Sierra
• Cadillac Escalade
• Regularly inspect suspension components.
• Ensure connectors are secure and free of corrosion.
• Avoid driving on excessively rough roads when possible.
Sensor Issue
• Drive cautiously if the warning light is on.
• Have the vehicle inspected by a professional if handling feels off.
• Do not ignore the warning light, as it may affect vehicle safety systems.
Check with your vehicle manufacturer for warranty coverage on sensors and related components.
The P0318 code has been associated with vehicles that frequently drive on rough terrain, leading to sensor wear.
Moderate – This issue can affect vehicle handling and safety systems, so it should be addressed promptly.
Ignoring this code may lead to compromised vehicle safety systems, which can increase the risk of accidents.
• Drive the vehicle on a known rough road.
• Monitor sensor signals with diagnostic equipment.
The rough road sensor is typically located near the vehicle's suspension components, often attached to the wheel hub or strut assembly.
Q: Can I drive with a P0318 code?
A: While you can drive with this code, it's best to address it soon as it may affect vehicle safety systems.
Q: How do I reset the P0318 code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue persists, the code may reappear.
Pro · Four-system diagnostics
A handheld scanner aimed at engine, transmission, ABS, and airbag diagnostic work.
Chassis and ABS faults usually need a scanner that can read brake-system data directly.
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Universal · Torque wrench
Useful when reassembly torque matters for wheel, suspension, and under-hood fasteners.
Useful when wheel, hub, or suspension hardware needs correct reassembly torque.
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