AutoCodes – RAM – U1518 RAM

U1518 RAM Code - Implausible Ambient Ait Temperature Signal Received

Quick Answer

The Powertrain Control Module (PCM) receives an implausible signal from the Ambient Temperature Sensor over the Controller Area Network (CAN) C bus from the Body Control Module (BCM). Common causes include Faulty Body Control Module (BCM), Body Control Module harness is open or shorted, Body Control Module 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: U1518 RAM indicates Implausible Ambient Ait Temperature Signal Received.
Common causes: Common causes include Faulty Body Control Module (BCM), Body Control Module harness is open or shorted, Body Control Module 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 1,698

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 Jun 02, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1518 RAM Description

OBDII Code U1518 RAM - Implausible Ambient Ait Temperature Signal Received - AutoCodes.com — U1518 RAM Code - Implausible Ambient Ait Temperature Signal Received

What does this mean?

What are the Possible Causes of the DTC U1518 RAM?

Faulty Body Control Module (BCM)
Body Control Module harness is open or shorted
Body Control Module circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC U1518 RAM?

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 U1518 RAM 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 U1518 RAM code?

Need more information on how to fix the U1518 RAM code? Get Access to Factory Service Manuals

Need Help with the Code?

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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.

Frequently Asked Questions about U1518 RAM Code

1. What are the common symptoms of OBDII code U1518 RAM?

The common symptoms of OBDII code U1518 RAM include incorrect ambient air temperature readings on the vehicle's display, issues with the air conditioning system, and potential activation of the engine cooling fan.

2. What could cause the OBDII code U1518 RAM to trigger?

The OBDII code U1518 RAM is typically triggered when the body control module (BCM) detects an implausible ambient air temperature signal received from the ambient air temperature sensor.

3. How can I diagnose the cause of the OBDII code U1518 RAM?

To diagnose the cause of the OBDII code U1518 RAM, you can start by checking the wiring and connections to the ambient air temperature sensor, testing the sensor's resistance, and verifying the sensor's output voltage using a multimeter.

4. What repair tips can help fix the OBDII code U1518 RAM?

Repair tips for fixing the OBDII code U1518 RAM include checking and repairing any damaged wiring or connections, replacing the ambient air temperature sensor if necessary, and clearing the code with an OBDII scanner.

5. Can I drive my vehicle with the OBDII code U1518 RAM?

While it may be possible to drive your vehicle with the OBDII code U1518 RAM, it is recommended to address the underlying issue promptly to prevent potential issues with the vehicle's air conditioning system and engine cooling.

6. Does fixing the ambient air temperature sensor always resolve the OBDII code U1518 RAM?

Fixing the ambient air temperature sensor is a common solution for resolving the OBDII code U1518 RAM, but it is also important to check the wiring and connections to ensure there are no other underlying issues causing the fault.

7. How do I reset the OBDII code U1518 RAM after making repairs?

After making the necessary repairs to address the OBDII code U1518 RAM, you can reset the code using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes to clear the fault memory.

8. Are there any recalls related to the OBDII code U1518 RAM in specific vehicle models?

Recalls related to the OBDII code U1518 RAM may vary by vehicle manufacturer and model year. It is recommended to check with the vehicle manufacturer or authorized dealership for any relevant recalls or service bulletins.

9. Can extreme weather conditions affect the triggering of the OBDII code U1518 RAM?

Extreme weather conditions, such as significant temperature fluctuations, can potentially affect the triggering of the OBDII code U1518 RAM by causing false readings from the ambient air temperature sensor.

10. How can I prevent the OBDII code U1518 RAM from reoccurring in the future?

To prevent the OBDII code U1518 RAM from reoccurring in the future, it is essential to perform regular maintenance checks on the ambient air temperature sensor, keep the sensor and its connections clean, and address any issues promptly to avoid further complications.