CAN network

U0310 — Software Incompatible With Fuel Pump Control Module

Severity: medium Drive with care, to a shop

What U0310 means

U0310 means a control unit on the network found that the software in the fuel pump control module does not match the version or configuration it expects. This usually appears after the pump or module was replaced and the new unit was never programmed to the vehicle. Normally the module takes commands from the engine computer over the network and holds correct fuel pressure, so a software conflict breaks that communication.

Symptoms

  • No-start after a fuel pump or module replacement
  • Network (U) codes appearing after the repair
  • Check Engine light on
  • Hesitation or power loss under load
  • Fuel pump not running or no fuel pressure

Possible causes

  1. New fuel pump control module not programmed
  2. Module with the wrong part number installed
  3. Incomplete flash or programming session
  4. Outdated software in the engine computer or other modules
  5. Damaged wiring or connector at the module
  6. Low battery voltage during programming

How to diagnose

  1. Scan all modules, note which ones set codes and review freeze frame data
  2. Compare the installed module's part number with the catalog for the VIN
  3. Check battery voltage and the module's ground connection
  4. Inspect the pump module connector and wiring for corrosion or damage
  5. Check power and CAN network signals at the module connector
  6. Look up software versions and available updates from the manufacturer
  7. Program or configure the module with a capable scan tool, then recheck codes

Common fixes

  • Program or set up the new module to the vehicle
  • Replace the module with the correct part number
  • Reflash the module and update the engine computer software
  • Repair the wiring or connector
  • Clear codes and verify starting and fuel pressure

Questions and answers

What does U0310 mean?

It means the fuel pump control module's software is not compatible with the rest of the vehicle's systems. Most often the module was replaced and never programmed.

Can I fix U0310 myself?

Clearing the code won't help until the module is programmed. You usually need a scan tool with programming ability, so many owners go to a shop.

Why won't my car start after a fuel pump replacement?

Many vehicles won't run the pump until the engine computer recognizes the module. Without proper setup and software, fuel isn't delivered.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.