John Deere 2629.03 – Engine Control Unit (ECU): Fixed Turbocharger Compressor Outlet Temperature Signal Out Of Range High

Fault code 002629.03 is triggered when the compressor outlet temperature signal is detected to be out of range high, indicating a short to 12 volts. This erroneous signal implies either an electrical fault in the compressor's temperature monitoring circuit or perceived overheating. When this code is active, the control software may respond by adjusting or limiting engine performance (derating) to prevent damage.

• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 8RT Series Tractors (8310RT, 8335RT, 8360RT)
• 9RT Series Track Tractors (9470RT, 9520RT, 9570RT)
• 8R / RW Series Tractors (8245R to 8400R)
• Self-Propelled Forage Harvesters (7180, 7280, 7380, 7480, 7580, 7780, 7980)
• 245GLC Excavators

1. 1

   Inspect the compressor outlet temperature sensor harness for damaged wires, chafing, or loose connections that could result in a short to 12 volts.

2. 2

   Use a multimeter to verify the voltage at the compressor outlet temperature sensor aligns with manufacturer specifications.

3. 3

   Check ECU inputs and outputs to ensure the module is processing signals correctly and rule out a module failure.

1. 1

   Disconnect power

   Disconnect the battery or ensure the machine is powered down before working on the electrical system.

2. 2

   Repair or replace wiring

   Repair or replace any damaged wiring or connectors found during the visual and multimeter inspections.

3. 3

   Replace temperature sensor

   If the wiring is intact and diagnostics confirm the fault lies with the sensor itself, remove and replace the faulty compressor outlet temperature sensor.

4. 4

   Reprogram or replace ECU

   If the sensor and wiring are both verified as good but the fault persists, consider reprogramming or replacing the ECU.

5. 5

   Reset ECU

   After repairs are completed, reset the ECU to clear the fault code.

6. 6

   Conduct test run

   Conduct a test run under normal operational conditions to ensure the issue is fully resolved and the code does not return.