What it means
A receiving control module has detected invalid data from the Transmission Fluid Pump Module. The code does not specify which data is invalid or why.
How it works
The Transmission Fluid Pump Module controls or reports the pump that circulates transmission fluid. U058B identifies invalid data received from that module, but the code alone does not reveal which data is wrong or whether the cause is the module, its circuits, or network communication.
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 preserve freeze-frame data, noting whether U058B appears with transmission pump, pressure, or communication faults.
- Check live data from the Transmission Fluid Pump Module for implausible status or command values and compare them with actual transmission symptoms.
- Inspect the pump module's connector and harness for loose pins, corrosion, fluid intrusion, or damage.
- Test the module's power, ground, and network circuits against the wiring diagram and manufacturer's specification.
- If the circuits are sound, follow the manufacturer's procedure to check module software, network messages, and pump operation before condemning the module.
Common fixes
- Clean and secure a loose or corroded Transmission Fluid Pump Module connector.
- Repair damaged wiring or poor power and ground connections at the pump module.
- Correct software or configuration if the fault followed a module replacement or update.
- Replace the pump module if diagnostic testing confirms its data remains invalid.
- Repair the pump or transmission hydraulics if independent tests identify a mechanical or fluid-circulation problem.
Can I keep driving?
Do not continue driving if shifting becomes abnormal, the transmission warning appears, or the vehicle limits drive; inadequate fluid circulation can cause further transmission damage. Stop safely and arrange prompt diagnosis.
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.