John Deere 655.18 – Engine Control Unit (ECU): Injector #5 Not Responding / Fuel Injector #5 Flow Very Low / Injection Valve 5 Fault

This error code is triggered when the control module detects that the fuel flow from injection valve #5 is lower than expected, or the injector is simply not responding to commands.

• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 8R Series
• 8RT Series
• 9RT Series
• 8235R
• 8245R
• 8310R
• 8335RT
• 8360RT
• 8400R
• 9470RT
• 9520RT
• 9570RT
• 544K
• 644K
• 724K
• 744K
• 850L
• 750J
• 850K
• 9540
• 9560
• 9580
• 9640
• 9660
• 9680 WTS/STS
• 670G
• 770G
• 872G

1. 1

   Check for Leaks: Pull the DEF/fuel injector and physically check for injector leaking.

2. 2

   Check for Multiple Codes: If you are seeing multiple '65X.18' codes simultaneously (e.g., 651.18, 652.18, 653.18, 654.18, 655.18, 656.18), this strongly indicates an ECU driver issue or a software problem rather than a single failed injector. Machines experiencing all of these codes at once may require an ECU software update to prevent misdiagnosis and nuisance DTCs.

3. 3

   Verify Calibration: Ensure the ECU detects the correct QR code calibration for the installed injector. An incorrect part number calibration can cause flow errors.

4. 4

   Temperature Testing: Clear the codes and run the machine. Note if the code only returns when the engine is hot, which can point to thermal expansion causing an open circuit in the injector solenoid.

1. 1

   Replace Faulty Injector

   If diagnostic tests isolate the issue to cylinder #5, replace the defective injector with a new or remanufactured unit to restore proper fuel flow. (Note: Many diesel technicians recommend replacing the entire set of fuel injectors to ensure even atomization and balanced power, as mixing old and new injectors can cause vibrations or return codes).

2. 2

   Install New Seals

   Ensure all O-rings, sealing washers, and injector pins are replaced during installation.

3. 3

   Reset ECU

   After installing the new injector, clear the fault codes from the Engine Control Unit.

4. 4

   Conduct System Tests

   Run the engine and perform system tests (monitoring active codes on the diagnostic display) to ensure the injector operates correctly and the 000655.18 code does not return.