What it means
The control module detects that its internal date/time clock has lost synchronization with the vehicle network. Required for charge scheduling and event logging.
At a glance
- Usually lights the check-engine light
How it works
The control module keeps an internal clock that can support charge scheduling and time-stamped vehicle records. P0D1F sets when the module detects that its date or time is no longer synchronized with the vehicle network, which can follow a battery disconnect or a weak clock backup supply.
Common causes
Most likely first.
- Battery disconnect cleared internal clock
- RTC backup battery low
Symptoms
- Charging or vehicle system warning light may come on
- Scheduled charging may not follow the expected time
- Incorrect date or time may appear in vehicle displays or logs
How to diagnose it
- Check the displayed date and time and review freeze-frame or module data for synchronization status and related low-voltage or communication codes.
- Ask whether the vehicle's battery was recently disconnected or depleted, since that can reset the module clock.
- Set the date and time using the vehicle's normal controls, then check whether the synchronization fault returns.
- If the time resets again, inspect the module's power and ground connections and backup supply according to the wiring diagram.
- Test the clock backup battery or supply using the manufacturer's procedure and verify the module retains time after repair.
Common fixes
- Set the vehicle's date and time after a battery disconnect.
- Repair a poor module power or ground connection.
- Replace the clock backup battery if equipped and confirmed weak.
- Repair a module or network synchronization fault if testing identifies one.
Can I keep driving?
Driving is generally possible if the vehicle has no other warnings or operating problems, but scheduled charging may occur at the wrong time and logs may be inaccurate. Check charging times manually until the clock stays synchronized.
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.