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The diagnostic trouble code E71432 indicates an invalid signal from the Integrated Chassis Management (ICM) interface related to the vehicle speed. Here’s more information about this code:

Definition/Description: E71432 is a fault code that is triggered when the signal from the ICM interface regarding the vehicle speed is determined to be invalid. The ICM is responsible for monitoring various vehicle parameters, including the speed, and communicating this information to other control modules in the vehicle.

Meaning: The code indicates that the signal received from the ICM interface regarding the vehicle speed is not valid or cannot be properly interpreted by the receiving control module. This could be due to a malfunction or communication issue within the ICM or related components.

Causes: Possible causes for this code may include:

1. Faulty ICM: A malfunctioning ICM may not be generating or transmitting the correct vehicle speed signal.
2. Wiring or connection issues: Problems with the wiring harness or connectors between the ICM and the receiving control module can result in an invalid signal.
3. Communication bus fault: Issues with the communication bus, such as a damaged or shorted wire, can disrupt the transmission of signals, including the vehicle speed.

Symptoms: Symptoms associated with this code may include:

1. Inaccurate or erratic speedometer readings on the instrument cluster.
2. Malfunctioning cruise control system.
3. ABS or traction control system issues, as they rely on accurate speed information.
4. Illumination of the check engine light or other warning lights related to the ICM or speed-related systems.

Diagnosis: Diagnosing the exact cause of the invalid signal from the ICM interface may involve the following steps:

1. Using a diagnostic scanner or software specific to the vehicle’s make and model to retrieve and interpret the E71432 code.
2. Checking the wiring harness and connectors for any signs of damage, corrosion, or poor connections.
3. Testing the ICM to ensure it is generating and transmitting the correct vehicle speed signal.
4. Checking for any faults or communication issues on the vehicle’s communication bus using appropriate diagnostic tools.
5. Verifying the accuracy of the vehicle speed signal using alternative methods or reference sources.

Common Mistakes: Common mistakes when dealing with this code include:

1. Failing to perform a thorough inspection of the wiring and connections before replacing the ICM.
2. Neglecting to check for communication bus faults, which could be the underlying cause of the invalid signal.
3. Overlooking other potential causes such as faulty sensors or control modules that could affect the vehicle speed signal.

How serious is this? The severity of this code depends on the specific symptoms and systems affected by the invalid vehicle speed signal. Issues related to inaccurate speed information can impact the proper functioning of various systems, including the speedometer, cruise control, and ABS/traction control. It is recommended to address the issue to ensure accurate speed readings and maintain the functionality of related systems.

What repairs can fix the code? Possible repairs for this code may include:

1. Repairing or replacing the ICM if it is found to be faulty or not generating/transmitting the correct signal.
2. Repairing or replacing damaged wiring harnesses or connectors between the ICM and the receiving control module.
3. Resolving any communication bus faults, such as repairing damaged or shorted wires.

It’s important to note that these are general guidelines, and the exact diagnostic and repair steps may vary depending on the vehicle’s make, model, and year. Consulting the vehicle’s service manual or seeking assistance from a qualified technician is recommended for an accurate diagnosis and appropriate repairs.