[SOLVED] Dodge U0402 Code: Fast Fix For Invalid Transmission Data

The OBD code U0402 for Dodge indicates a communication error between the Transmission Control Module (TCM) and the Powertrain Control Module (PCM).

Symptoms include the Engine Light being ON.

Causes may include a faulty TCM, open/shorted TCM harness, poor electrical connection, or a faulty PCM.

This issue is serious as it can affect vehicle performance.

A possible fix involves inspecting and repairing the TCM and PCM wiring connections.

Repair Importance Level	10.0 (Out of 10)
Estimated Repair Time	Approximately 1.0 hour
Repair Difficulty Level	10.0 (Out of 10)

Symptoms of the Dodge u0402 OBD Code

The Dodge U0402 fault code indicates a communication error between the engine control module and the transmission control module.

Symptoms: Service Electronic Throttle Control warning light may illuminate.
Loss of communication with the Gear Shift Module.
Erratic shifting behavior from the transmission.
Difficulty starting the vehicle.
Engine stalling while driving.

Causes of the Dodge u0402 OBD Code

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Possible triggers for Dodge U0402 include issues with the powertrain control module (PCM) or the transmission control module (TCM).

U0402 can be caused by a faulty Transmission Control Module (TCM).
A Transmission Control Module harness that is open or shorted.
A Transmission Control Module circuit with poor electrical connection.
A faulty Powertrain Control Module (PCM).

Fixing Dodge Error Code u0402 Step By Step

Resolve Dodge U0402 by inspecting the wiring harness for any damage or corrosion.

To fix the Dodge OBDII code U0402, start by reviewing the possible causes mentioned above and visually examining the corresponding wiring harness and connectors.
Check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
If no issues are found with the wiring and connectors, proceed to test the powertrain control module (PCM) for proper operation.
Consider reprogramming or replacing the PCM if necessary to resolve the U0402 fault code.

Cost Of Fixing Dodge u0402 Fault Code

The repair for Dodge U0402 involves diagnosing and fixing a communication issue with the powertrain control module.

The cost to diagnose and fix Dodge OBD code U0402 is typically based on 1. 0 hour of labor, with rates ranging from $75 to $150 per hour.

The total cost will depend on shop rates, complexity of the issue, and any additional parts or services needed.

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Details of the Dodge u0402 OBD Code

Dodge U0402 code indicates an invalid data received from the transmission control module.

Dodge OBD code U0402 means an invalid data received from transmission control module (TCM).

This code is triggered by the powertrain control module (PCM) when it detects that the data received from the TCM is invalid or missing.

The U0402 code is related to the communication system between the PCM and the TCM in the vehicle.

It indicates a communication error between these two modules, which can be caused by wiring issues, a faulty TCM, a faulty PCM, or a poor connection between the modules.

Mechanic’s Tech Notes

For Dodge code U0402, check for communication issues with the powertrain control module (PCM).

To diagnose and fix OBDII code U0402 in a Dodge, start by checking the Transmission Control Module (TCM) power and ground using a multimeter.

Verify TCM communication over the Controller Area Network (CAN) network with a scan tool.

If the TCM does not respond, reprogramming or reflashing may be necessary.

Visually inspect the wiring harness and connectors for any damage, focusing on broken, bent, or corroded pins.

Ensure all connections are secure.

If the issue persists, consider consulting a professional for further diagnosis and repair.

FAQ

1. What does OBD code U0402 mean in a Dodge vehicle?

OBD code U0402 in a Dodge means a communication issue between the TCM and PCM. Check TCM wiring, connectors, and PCM for faults.

2. How can I diagnose the cause of OBD code U0402 in my Dodge?

Diagnose OBD code U0402 in Dodge by checking TCM, harness, and connections for faults. Inspect wiring for damage, broken pins, or corrosion.

3. What are the common symptoms associated with OBD code U0402 in a Dodge vehicle?

Common symptoms of OBD code U0402 in a Dodge vehicle include Engine Light ON. Possible causes are a faulty TCM, TCM harness issues, or PCM problems.

Wrap Up

If your Dodge is displaying OBD code U0402 and experiencing issues with the vehicle speed control system, it could be caused by a faulty speed control switch, damaged wiring harness, or a malfunctioning speed control module.

To address Dodge OBD code U0402, start by inspecting the wiring harness and connectors for any signs of damage or corrosion.

Test the speed control switch and module for proper functionality, and replace any components that are found to be faulty.

Ensure all connections are secure to resolve the U0402 fault code effectively.