U055D: Invalid Data Received From Special Purpose Vehicle Control Module D

What it means

A receiving control module has detected invalid data from Special Purpose Vehicle Control Module D. The code does not specify which data is invalid or what functions the module controls.

How it works

Special Purpose Vehicle Control Module D sends vehicle-specific status or control data over the network to other modules. A receiving module sets U055D when that data is present but fails its validity checks; the code does not identify the data item or the module's function.

Common causes

Most likely first.

1. Module internal fault or sensor input drift
2. Software version mismatch after replacement
3. 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

1. Scan all modules and save freeze-frame and communication details to identify which module logged U055D and when it appeared.
2. Check whether the fault is current or history and compare it with any symptoms in functions associated with Special Purpose Vehicle Control Module D.
3. Inspect the module's connectors and accessible network wiring for loose plugs, corrosion, damage, or signs of recent repair.
4. Check module power, ground, and network communication using the vehicle wiring information and manufacturer's specification.
5. Review gateway routing and module software or configuration history, especially if a module was recently replaced or programmed.
6. If wiring, power, network, and configuration are sound, use vehicle-specific diagnostics to assess the module's inputs and internal operation.

Common fixes

• Reconnect or repair a loose or damaged connector at Special Purpose Vehicle Control Module D.
• Repair damaged network wiring or correct a poor power or ground connection.
• Correct gateway routing or module configuration if it is mismatched.
• Update or program the module with the correct vehicle-specific software where applicable.
• Repair or replace Special Purpose Vehicle Control Module D if testing confirms an internal fault.

Can I keep driving?

U055D alone does not identify a safety-critical function, so driving impact depends on what Module D controls on this vehicle. Avoid relying on any affected function, and stop if warnings or reduced control appear; have braking, steering, or other safety-related symptoms assessed before continuing.