CD99
LowCD99 — Unknown Chassis/ABS Code (JB4-Related)
Description
What CD99 Means
CD99 falls under the chassis_abs category and is classified as a low-severity fault. The source data labels it “Unknown code (JB4 related)” — meaning its appearance is tied to the JB4 tuning module. The code can point to a problem with the module's firmware or its settings.
The JB4 module is an external device that interferes with the factory engine electronics. Because the code is logged in the chassis_abs category, it may be connected to how the module interacts with the chassis/ABS systems, though the source data doesn't spell out the exact mechanism. What's certain is that the code is associated with JB4 and calls for checking the module's firmware and configuration.
Symptoms
Symptoms
- Symptoms vary and depend on how the car is driven and how the JB4 is set up.
- The source data doesn't list specific symptoms.
Causes and fixes
Diagnosis and Repair
Step 1. Check the JB4 Settings
Check the current settings on the JB4 tuning module for incorrect parameters.
Step 2. Update the Firmware
Update the JB4 firmware to the current version.
> The source data doesn't include any additional diagnostic steps or a tool list.