What it means
A receiving control module has detected invalid data from the Hybrid Battery Pack Sensor Module. The code does not specify which data is invalid or why.
How it works
The hybrid battery pack sensor module reports measurements used to monitor the battery pack, such as its operating condition. A receiving module sets U059B when data from that sensor module fails validity checks; the code does not identify which measurement is wrong.
Common causes
Most likely first.
- Module internal fault or sensor input drift
- Software version mismatch after replacement
- Gateway module routing CAN messages incorrectly
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
How to diagnose it
- Scan all modules and save freeze-frame or event data to see which module logged U059B and whether hybrid battery or network codes are also present.
- Check the 12-volt battery condition and module power supply because low or unstable voltage can disturb sensor-module communications.
- Visually inspect the hybrid battery sensor module's accessible connectors and harness for damage, corrosion, moisture, or signs of recent service disturbance.
- Compare available live battery-pack sensor data with related pack temperature, voltage, and operating-status readings for missing or implausible values.
- If the module or gateway was recently replaced, verify that its software and configuration match the vehicle.
- If the fault persists, have the module network and battery-pack sensing system checked with the manufacturer's procedure; avoid opening or probing high-voltage components.
Common fixes
- Repair damaged accessible wiring or secure and clean the sensor-module connector.
- Resolve a weak 12-volt battery or module power-supply fault.
- Apply the correct software or configuration after a sensor-module or gateway replacement.
- Replace the hybrid battery pack sensor module only after its wiring, supply, and reported data have been verified.
Can I keep driving?
If hybrid-system or battery warnings appear, or power is reduced, stop somewhere safe and follow the vehicle's warning instructions; do not handle high-voltage parts. Continued operation with unreliable battery monitoring can lead to restricted operation or a hybrid-system shutdown.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.