AutoCodes – RAM – U142C RAM

U142C RAM Code - implausible Data Received From Exhaust Valve 2

Quick Answer

The purpose of the Active Exhaust Valves are to reduce exhaust noise in order to meet pass-by noise regulations. Common causes include Faulty Active Exhaust Valve 2 Actuator, Active Exhaust Valve 2 Actuator harness is open or shorted, Active Exhaust Valve 2 Actuator 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: U142C RAM indicates implausible Data Received From Exhaust Valve 2.
Common causes: Common causes include Faulty Active Exhaust Valve 2 Actuator, Active Exhaust Valve 2 Actuator harness is open or shorted, Active Exhaust Valve 2 Actuator 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 566

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 23, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U142C RAM Description

The purpose of the Active Exhaust Valves are to reduce exhaust noise in order to meet pass-by noise regulations. The Active Exhaust Valves consist of two parts. First is the mechanical butterfly valves that are welded into the exhaust pipe on each bank. Mounted to each of these is a smart actuator. They are connected to the mechanical valves through a transmission spring. This is to help reduce heat from transferring between the mechanical butterfly valves and the actuators.
The Active Exhaust Valve actuators communicate with the Powertrain Control Module (PCM) over a LIN Bus circuit. The Active Exhaust Valve actuator 1 (left) and Active Exhaust Valve actuator 2 (right) each has a unique part number/internal ID. The PCM can identify each actuator location by this unique ID. The PCM sends a position command to the Active Exhaust Valve actuators based on engine torque, rpm and vehicle speed. The Active Exhaust Valve actuators move the butterfly valves to the commanded position. An internal Hall Effect sensor counts the pulses and determines valve position. The valve actuators are calibrated at every Key-ON event. The PCM sends full open and full closed commands and checks the actual position against the commanded position. If for any reason the calibration is unsuccessful, the actuators are self-diagnosing and report fault flags to the PCM over the LIN Bus.
If the valve position doesn't match a predetermined calibration, a performance code is set and the valves will default to the full open position. If an actuator is not attached to the mechanical valve, or the transmission spring is broken or missing, the actuator will continue to rotate indefinitely and set a fault. Also, if the mechanical valve is stuck and will not move, a fault will set.

OBDII Code U142C RAM - implausible Data Received From Exhaust Valve 2 - AutoCodes.com — U142C RAM Code - implausible Data Received From Exhaust Valve 2

What does this mean?

What are the Possible Causes of the DTC U142C RAM?

Faulty Active Exhaust Valve 2 Actuator
Active Exhaust Valve 2 Actuator harness is open or shorted
Active Exhaust Valve 2 Actuator circuit poor electrical connection

How to Fix the DTC U142C 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 U142C 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.

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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 U142C RAM Code

1. What are the common symptoms of OBDII code U142C RAM "implausible Data Received From Exhaust Valve 2"?

- Common symptoms include engine misfires, rough idling, decreased fuel efficiency, and potentially a check engine light.

2. What are the possible causes of OBDII code U142C RAM?

- Possible causes may include a faulty exhaust valve 2 sensor, wiring issues, a malfunctioning ECM, or a poor connection in the circuit.

3. How can I diagnose the OBDII code U142C RAM related to exhaust valve 2?

- To diagnose this issue, you can use an OBDII scanner to read the code, inspect the wiring and connections related to exhaust valve 2, and perform a thorough visual inspection of the sensor.

4. Can I still drive my vehicle with the OBDII code U142C RAM present?

- It is not recommended to drive your vehicle with this code present, as it can lead to further engine damage or performance issues. It's best to address the underlying problem promptly.

5. What are some repair tips for fixing OBDII code U142C RAM?

- Repair tips may include checking and repairing any damaged wiring, replacing the exhaust valve 2 sensor if necessary, ensuring proper connections, and clearing the code to see if it reoccurs.

6. Is it safe to clear the OBDII code U142C RAM and see if it comes back?

- Clearing the code temporarily may help you determine if it was a one-time issue or a recurring problem. However, it's crucial to address the root cause to prevent future occurrences.

7. How much does it typically cost to repair OBDII code U142C RAM?

- The cost of repair can vary depending on the specific issue causing the code. It may involve replacing a sensor, fixing wiring, or addressing another component, so costs can range from relatively inexpensive to more costly.

8. Can a DIY enthusiast fix OBDII code U142C RAM, or should I seek professional help?

- Depending on your mechanical skills and knowledge, you may be able to address simple issues like checking connections or replacing a sensor. For more complex problems, it's advisable to seek professional help.

9. Is OBDII code U142C RAM a common issue in certain vehicle makes and models?

- This code can occur in various vehicle makes and models, particularly those equipped with the relevant sensors and systems related to exhaust valve monitoring.

10. How urgent is it to address OBDII code U142C RAM?

- It's important to address this code promptly to prevent potential engine damage or performance issues. Ignoring the problem could lead to further complications down the line.