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 operation of the pump that circulates transmission fluid. U0588 is set when another module receives data from that pump module that fails validity checks, which can affect transmission operation even though the code does not identify the invalid value.
Common causes
Most likely first.
- Transmission fluid pump module fault
- Wiring or connector fault
- Module power or ground fault
- Network data or software issue
Symptoms
- Transmission warning lamp may illuminate
- Transmission operation may be limited
- Stored communication fault codes
How to diagnose it
- Scan the transmission and related modules, save freeze-frame data, and check for pump, pressure, or communication codes that clarify when U0588 occurs.
- Use live data to compare the pump module's reported status or commands with transmission warnings and operating symptoms.
- Inspect the Transmission Fluid Pump Module connector and harness for loose pins, corrosion, fluid contamination, or damage.
- Check the module's power, ground, and network circuits using the wiring diagram and manufacturer's specification.
- If circuit checks pass, test pump-module data and transmission operation with the manufacturer's diagnostic procedure before replacing parts.
Common fixes
- Repair a loose, contaminated, corroded, or damaged pump-module connector.
- Repair damaged power, ground, or network wiring to the Transmission Fluid Pump Module.
- Correct a software or configuration issue if it followed a module replacement or update.
- Replace the pump module if testing confirms it is transmitting invalid data.
- Repair the transmission fluid pump or related transmission components if separate tests confirm a mechanical or hydraulic fault.
Can I keep driving?
If the transmission warning is on, shifting is abnormal, or drive is limited, avoid driving except to reach a safe stopping place; loss of fluid circulation can worsen transmission damage. 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.