U142B Code - implausible Data Received From Exhaust Valve 1
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 1 Actuator, Active Exhaust Valve 1 Actuator harness is open or shorted, Active Exhaust Valve 1 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
- U142B indicates implausible Data Received From Exhaust Valve 1.
- Common causes
- Common causes include Faulty Active Exhaust Valve 1 Actuator, Active Exhaust Valve 1 Actuator harness is open or shorted, Active Exhaust Valve 1 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.
Code U142B Description
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.
What are the Possible Causes of the DTC U142B?
- Faulty Active Exhaust Valve 1 Actuator
- Active Exhaust Valve 1 Actuator harness is open or shorted
- Active Exhaust Valve 1 Actuator circuit poor electrical connection
How to Fix the DTC U142B?
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 U142B 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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Information for Specific Makes
- U142B Chrysler — implausible Data Received From Exhaust Valve 1
- U142B Dodge — implausible Data Received From Exhaust Valve 1
- U142B Jeep — implausible Data Received From Exhaust Valve 1
- U142B RAM — implausible Data Received From Exhaust Valve 1
Frequently Asked Questions about U142B Code
What does the OBDII code U142B mean?
U142B indicates that the vehicle's control module has received implausible or invalid data from Exhaust Valve 1, suggesting a communication or sensor issue.
What are the common symptoms of the U142B code?
Common symptoms include a check engine light, reduced engine performance, poor fuel efficiency, or erratic exhaust system behavior.
What causes the U142B code to appear?
Possible causes include a faulty exhaust valve position sensor, damaged wiring or connectors, a malfunctioning control module, or software glitches.
Can the U142B code cause serious damage if ignored?
Ignoring this code may lead to reduced engine performance, increased emissions, and potential damage to the exhaust system over time.
How can I diagnose the U142B code?
Diagnosis involves using an OBDII scanner to confirm the code, inspecting wiring and connectors for damage, and testing the exhaust valve position sensor for proper operation.
Is the U142B code specific to certain vehicles?
Yes, U142B is a manufacturer-specific code, so its exact meaning and components affected may vary depending on the vehicle make and model.
Can I drive my car with the U142B code?
While it may be possible to drive the car, it is not recommended as it could lead to further damage or reduced performance.
How is the U142B code typically repaired?
Repairs may include replacing the exhaust valve position sensor, repairing damaged wiring or connections, or reprogramming/updating the control module software.
What tools do I need to fix the U142B code?
Basic tools include an OBDII scanner, a multimeter for electrical testing, and potentially specialized tools for accessing and replacing the exhaust valve sensor.
How much does it cost to fix the U142B code?
The cost depends on the specific issue but typically ranges from $100 to $500, depending on labor and parts required.
Discuss the causes and fixes for U142B OBDII Code
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