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The diagnostic trouble code D017B7 indicates a communication problem between the ICM (Instrument Cluster Module) and the DSC (Dynamic Stability Control) module related to the actual braking torque sum. Here’s more information about this code:

Definition/Description: D017B7 is a code generated when the ICM fails to receive a message regarding the actual braking torque sum from the DSC module. The ICM is responsible for various functions related to instrument cluster display and vehicle information, while the DSC module oversees the vehicle’s stability and traction control.

Meaning: The code suggests that there is a communication issue between the ICM and the DSC module, specifically related to the actual braking torque sum. This can indicate a potential problem with the operation of the braking system or the communication between the modules.

Causes: Some potential causes for this code include:

1. Faulty DSC module: The DSC module may be malfunctioning or experiencing internal issues that prevent it from transmitting the actual braking torque sum message correctly.
2. Faulty ICM: The ICM itself may have a malfunction or internal issue that prevents it from receiving the actual braking torque sum message from the DSC module.
3. Wiring or connector issues: There may be wiring or connector problems between the DSC and ICM modules, such as loose connections, damaged wires, or corroded terminals, disrupting the communication.
4. Software or programming issues: There may be software glitches or programming errors within either module that affect the communication and message transmission.

Symptoms: The symptoms associated with this code may include:

1. Illumination of the ABS (Anti-lock Braking System) warning light or other brake-related warning lights on the instrument cluster.
2. Malfunction or limited functionality of the stability control and traction control systems.
3. Loss of brake system information on the instrument cluster display.
4. Error messages related to the braking system displayed on the instrument cluster.

Diagnosis: Diagnosing the exact cause of the communication issue requires performing a series of tests and inspections, including:

1. Using a diagnostic scanner to retrieve and interpret the D017B7 code.
2. Checking for any additional related codes or warnings in other control modules.
3. Inspecting the wiring and connectors between the DSC and ICM modules for damage, loose connections, or corrosion.
4. Testing the DSC module and ICM module separately for proper operation.
5. Verifying the software versions and performing any necessary updates or reprogramming.
6. Conducting a thorough inspection of the braking system to ensure it is functioning correctly.

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

1. Neglecting to check the wiring and connectors for faults before replacing modules.
2. Assuming the problem is solely related to one module without considering the communication aspect.
3. Not performing a comprehensive inspection of the braking system to identify any issues.

How serious is this? The severity of this code depends on the specific vehicle and the importance of the braking system and stability control. A malfunctioning braking system and stability control can affect vehicle safety and control, so it’s essential to address the issue promptly.

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

1. Repairing or replacing damaged wiring or connectors between the DSC and ICM modules.
2. Replacing a faulty DSC module or ICM module if diagnosed as the cause of the communication issue.
3. Updating or reprogramming the software of the DSC and ICM modules if necessary.
4. Conducting repairs or adjustments to the braking system if any issues are identified.

Related Codes: There may be related codes stored in the vehicle’s system, depending on the specific make and model. It’s important to retrieve and address any additional codes present for a comprehensive diagnosis.

Please note that the specific diagnostic and repair steps may vary depending on the vehicle make, model, and year. It’s recommended to consult the vehicle’s service manual or seek assistance from a qualified mechanic for an accurate diagnosis and appropriate repairs.