Corroded or loose electrical connector at the remote start module or its CAN bus splice; Failed remote start module internal fault causing it to broadcast invalid data frames; Damaged or chafed wiring between the remote start module and the body control module; Low battery voltage or poor ground causing the remote start module to reset and send corrupt data; Aftermarket remote start installation with incorrect CAN bus termination or wiring; Software incompatibility or failed flash in the remote start module or gateway module; Water intrusion into the remote start module or its connector causing signal degradation

DTC codes / U05xx · Network communication / U0555

U0555Invalid Data Received From Remote Start Module

Q: What does code U0555 mean?

Invalid Data Received From Remote Start Module. U0555 is a communication fault where the module that coordinates remote start functions sends data that the receiving module judges to be invalid or out of range. The computer has detected a message from the remote start module that fails its internal plausibility or checksum validation, so it cannot trust the information for starting, climate control, or security decisions.

U0555 is a communication fault where the module that coordinates remote start functions sends data that the receiving module judges to be invalid or out of range. The computer has detected a message from the remote start module that fails its internal plausibility or checksum validation, so it cannot trust the information for starting, climate control, or security decisions.

SystemNetwork

Code typeGeneric (all makes)

SeverityLow

Fix difficultyIntermediate

AreaNetwork communication

Symptoms you may notice

Remote start feature fails to engage or shuts down immediately after starting
Warning light on the dash, often the check engine light or a dedicated remote start indicator
Key fob buttons for remote start do not respond or require multiple presses
Climate control or heated seats do not activate during a remote start request
Often no symptoms besides the warning light when the fault is intermittent
Vehicle may start normally with the key or push button despite the remote start failure

Common causes, most likely first

Corroded or loose electrical connector at the remote start module or its CAN bus splice
Failed remote start module internal fault causing it to broadcast invalid data frames
Damaged or chafed wiring between the remote start module and the body control module
Low battery voltage or poor ground causing the remote start module to reset and send corrupt data
Aftermarket remote start installation with incorrect CAN bus termination or wiring
Software incompatibility or failed flash in the remote start module or gateway module
Water intrusion into the remote start module or its connector causing signal degradation

How to diagnose and fix it

Record all stored codes and freeze-frame data with a scan tool before clearing anything
Inspect the remote start module connector and ground for corrosion, looseness, or water intrusion
Check battery voltage and perform a load test; low voltage commonly corrupts module data
Verify CAN bus integrity with a scope or resistance check at the remote start module connector
Consult service information for any software updates or calibration bulletins for the remote start module
Substitute a known-good remote start module only after wiring and power checks pass
Clear codes and perform a road test with remote start cycles to confirm the repair

Remote start data faults that fool technicians

A weak battery or bad ground often sets U0555 because the remote start module browns out and transmits malformed frames, so always load-test the battery before condemning the module.
Aftermarket remote start kits spliced into the CAN bus are a leading cause of invalid data codes, and the fault often traces to a poor splice rather than the module itself.
U0555 can be stored intermittently by a gateway module that rejects a single corrupt frame, so a one-time code with no symptoms may not justify module replacement.
Water intrusion into a footwell or trunk-mounted remote start module corrodes pins and produces invalid data long before the module fails completely.
Some vehicles set U0555 when the remote start module is missing or unplugged during service, so check for recent body or electrical work before diagnosing a hard fault.

Can I keep driving with U0555?

The vehicle remains safe to drive because the fault affects only the remote start convenience feature, but avoid relying on remote start until repaired. If the warning light is accompanied by other communication codes or starting problems, have it diagnosed promptly.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.