U0405Generic code

U0405 Code: Invalid Data Received From Cruise Control Module

The U0405 code means the cruise control module is sending messages, but with data that does not make sense or is out of range. The cruise control is disabled as a result. The module is often just passing along a bad reading from one of its own sensors.

Severity
Medium
Can I keep driving?
Yes, but with caution
Estimated cost
$0 to $1,200
Difficulty
Hard
System
Communication Network
Applies to
All OBD2 vehicles

Updated Reviewed by Renzo Chacca

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What the U0405 code means

Unlike a loss of communication, here the messages from the cruise control module do arrive, but their content is not valid: impossible values, counters that do not advance or incompatible data. The module that receives that data stores the U0405 code and stops using it.

The usual causes are a sensor connected to the cruise control module that gives wrong readings (the module forwards the bad data), incompatible software after a module was replaced or reprogrammed, an incorrect configuration, or an internal failure. Check the codes stored in the cruise control module itself first: they usually point to the origin.

After a module is replaced, it often has to be configured (coded) so that it sends data in the format the other modules expect. Skipping that step is a common reason the code appears right after a repair.

U0405 code symptoms

  • Warning lights on.
  • The cruise control is disabled.
  • Codes stored in the sending module.

Likely causes of the U0405 code

  1. Codes stored in the cruise control module itself. One of its sensors is giving wrong readings.
  2. Incompatible software or configuration. This follows a module that was replaced or reprogrammed.
  3. Unstable supply voltage. Modules send wrong data when they reset.
  4. Internal failure of the cruise control module. Only after sensors, software and power have been ruled out.

How to diagnose the U0405 code step by step

  1. Read the codes in the cruise control module and solve those first.
  2. Check for recent replacements or reprogramming.
  3. Verify the module configuration with a compatible scan tool.
  4. Measure the battery voltage.

How to fix the U0405 code

  • Resolve the codes in the sending module.
  • Configure or update the module software.
  • Replace the module if it has an internal failure.
  • Clear the codes in all modules.

Technical reference data

  • Invalid data includes out-of-range values, message counters and incorrect checksums.
  • These are reference values: check the manufacturer data for your vehicle.

Brand-specific notes

After the repair, clear the codes in every module and confirm the U0405 code stays gone. Many modules keep old U codes from when the fault was present. Accessories installed later (alarms, GPS trackers, OBD2 adapters left plugged in permanently) are a frequent cause of network problems.

Frequently asked questions about U0405

What does the U0405 code mean?
It means the cruise control module is sending data that another module considers invalid, such as impossible values or counters that do not advance. The receiving module stored the code and stopped using that data.
Can I drive with a U0405 code?
With caution, depending on the system affected. The cruise control is disabled, so you will have to manage your own speed, and the rest of the vehicle should drive normally.
Is the cruise control module bad?
Not necessarily. Often it is only forwarding a wrong reading from one of its sensors, so read its own codes before you replace anything.
What is coding?
It is the configuration that adapts a module to the equipment on the vehicle. A replacement module often needs it before it sends data in the expected format.
How much does it cost to fix U0405?
Between $0 and $1,200. Clearing a sensor fault or recoding can be cheap, while replacing and programming a module is at the top of the range.
Will a U0405 code clear itself?
Only if the cause was temporary, such as a voltage dip. If the bad data is still being sent, the code will return after you clear it.
What is the most common cause of U0405?
A faulty sensor on the cruise control module, or software and configuration that do not match after a module was replaced or reprogrammed.

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