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U1477 RAM Code - Implausible Paddle Shifter Data Received

Quick Answer

The U1477 diagnostic trouble code (DTC) indicates that the vehicle's onboard computer has detected implausible data being received from the paddle shifter system. Common causes include Faulty paddle shifter module, Wiring or connection issues between the paddle shifter module and ECU, Software glitch in the vehicle's control system. 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
U1477 RAM indicates Implausible Paddle Shifter Data Received.
Common causes
Common causes include Faulty paddle shifter module, Wiring or connection issues between the paddle shifter module and ECU, Software glitch in the vehicle's control system.
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.
What is this?
Table of contents Created and updated by William Orellana on Aug 18, 2024
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Code U1477 RAM Description

The U1477 diagnostic trouble code (DTC) indicates that the vehicle's onboard computer has detected implausible data being received from the paddle shifter system. Paddle shifters are commonly found in vehicles equipped with automatic transmissions that offer manual shifting capabilities. This code suggests that there may be a communication issue between the paddle shifter module and the vehicle's electronic control unit (ECU).

OBDII Code U1477 RAM - Implausible Paddle Shifter Data Received
U1477 RAM Code - Implausible Paddle Shifter Data Received

Common Causes of U1477 RAM

  1. Faulty paddle shifter module.
  2. Wiring or connection issues between the paddle shifter module and ECU.
  3. Software glitch in the vehicle's control system.
  4. Electrical interference or short circuits.
  5. Water or moisture damage affecting the paddle shifter system.

Symptoms of U1477 RAM

  1. Paddle shifters not responding to input.
  2. Incorrect gear selection displayed on the instrument cluster.
  3. Transmission slipping or shifting erratically.
  4. Check Engine Light illuminated on the dashboard.
  5. Reduced performance or acceleration.

How to Fix U1477 RAM

  1. Begin by conducting a thorough inspection of the paddle shifter system, checking for any visible damage or loose connections.
  2. Use a diagnostic scanner to retrieve and clear the DTCs stored in the vehicle's ECU.
  3. Test the paddle shifter module and wiring harness for continuity and proper operation.
  4. If necessary, replace the faulty paddle shifter module or repair any damaged wiring.
  5. Perform a reprogramming or calibration of the vehicle's control system to ensure proper communication between the paddle shifters and ECU.

Cost to Fix U1477 RAM

The cost of repairing an implausible paddle shifter data issue can vary depending on the specific cause of the problem and the extent of repairs needed. On average, the repair costs for this type of issue can range from $200 to $500, including parts and labor. However, it's essential to keep in mind that labor rates and part prices can fluctuate based on location, vehicle make and model, and the complexity of the repair. It's recommended to consult with a qualified mechanic or dealership for a more accurate estimate based on your vehicle's specific circumstances.

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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 U1477 RAM Code

1. What does the OBDII code U1477 indicate?

The code U1477 suggests that the vehicle’s control module has received implausible data from the paddle shifter circuit, indicating a possible fault or malfunction in the paddle shifting system.

2. What are common symptoms of code U1477?

Symptoms may include erratic shifting, inability to use paddle shifters, the transmission stuck in a particular gear, or the check engine light may come on.

3. What can cause the U1477 code to appear?

Causes of code U1477 can include faulty paddle shifters, damaged wiring or connectors in the paddle shifter circuit, issues with the transmission control module, or software needing an update.

4. How is the U1477 code diagnosed?

Diagnosis involves using a scan tool to read the fault code and examining the paddle shifter assembly and associated wiring for signs of damage or malfunction. Further diagnostic procedures may include checking the transmission control module and potentially updating the vehicle’s software.

5. What are the repair steps for fixing code U1477?

Repairing this fault might involve replacing damaged paddle shifters, repairing or replacing faulty wiring, reprogramming or replacing the transmission control module, or updating the vehicle’s software.

6. Can I drive my vehicle with code U1477 appearing?

While you might be able to drive the vehicle, it is not advisable as it can lead to further issues with the transmission system. It is best to address the problem promptly to avoid potential safety issues or more costly repairs later.

7. Is it necessary to use OEM parts for repairing the paddle shifters related to code U1477?

Using OEM parts is generally recommended to ensure compatibility and reliability, especially with components like paddle shifters that interact closely with the vehicle’s transmission and electronic systems.

8. How urgent is it to fix a U1477 code?

It is relatively urgent to address this code, as it involves the transmission control system, which is crucial for vehicle safety and performance. Delaying repairs can lead to more severe transmission issues.

9. Will code U1477 clear on its own if the issue is resolved?

Once the underlying issue is fixed, the code should be cleared using an OBDII scan tool. In some cases, the vehicle’s ECU may automatically reset the code after several successful driving cycles without detecting further anomalies.

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