U0451: Invalid Data Received From Serial Data Gateway Module E

What it means

A receiving module detected implausible data from serial data gateway E. Bridged messages between sub-buses (CAN/LIN/FlexRay/Ethernet) fail plausibility checks and are rejected.

At a glance

• Usually lights the warning light of the system that lost communication
• The engine or gearbox may go into limp mode

How it works

Serial data gateway E passes messages between vehicle networks, such as CAN, LIN, FlexRay, or Ethernet, so other modules can use them. A receiving module sets U0451 when information relayed by gateway E fails its plausibility checks and is rejected; this points to the received data, not necessarily a complete loss of communication.

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 record U0451, related communication codes, and freeze-frame details to identify which module rejected the data and when.
2. Check whether several modules report errors involving gateway E or one particular sub-bus, since that can help distinguish a routing issue from a single module fault.
3. Inspect accessible gateway E connectors and network wiring for looseness, corrosion, damage, or signs of water intrusion.
4. Use a capable scan tool to compare the relevant messages at the gateway and receiving module, if the vehicle supports this, and note where the values become implausible.
5. Check whether gateway E or a communicating module was recently replaced or updated, then verify its software and configuration against manufacturer requirements.
6. If wiring and configuration check out, follow manufacturer diagnostic procedures to test the gateway and the module identified as the source of the suspect data.

Common fixes

• Repair a loose, corroded, or damaged gateway E connector or network wire.
• Correct module configuration or software compatibility after a replacement or update.
• Repair or replace the module supplying the implausible data if its inputs or internal operation fail manufacturer checks.
• Repair or replace gateway E if testing confirms it routes messages incorrectly.

Can I keep driving?

If the vehicle enters limp mode or a safety-related function stops working, avoid unnecessary driving and arrange prompt diagnosis. A gateway data fault can disrupt several systems, so do not rely on affected driver aids or displays.