What it means
A receiving module detected implausible data from the remote-start module. Engine pre-start request or status values fail plausibility checks and are rejected.
How it works
The remote-start module sends pre-start requests and status information to other vehicle modules. U0555 sets when a receiving module rejects data attributed to that module because the request or status values fail plausibility checks.
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 and communication details to identify the receiving module and any related remote-start or security faults.
- Check whether remote starting is unavailable or behaves inconsistently, and note whether the vehicle starts normally using its regular controls.
- Inspect the remote-start module's connectors and harness for loose pins, corrosion, moisture or damage.
- Use a scan tool to review remote-start request and status data while checking the system's normal operating states.
- Look for gateway or network codes in other modules that could explain incorrect routing of remote-start messages.
- If wiring and routing are sound, check for an internal module fault or a software/configuration mismatch, especially after replacement.
Common fixes
- Repair damaged or corroded remote-start module wiring and connectors.
- Restore the module's power or ground connection if it is poor.
- Correct software or vehicle configuration after a remote-start module replacement.
- Repair or replace the remote-start module if its data remains implausible.
- Correct gateway routing if other network faults show that messages are being misdirected.
Can I keep driving?
If the vehicle starts and runs normally with its regular controls and no other warnings are present, driving is generally possible; avoid relying on remote start until it is repaired. If starting, security or other vehicle functions are affected, park safely and investigate before continuing.
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.