John Deere 101 – ECU: Crankcase Pressure Signal Extremely High

The pressure inside the engine's crankcase has exceeded the maximum normal operating threshold. This abnormal pressure build-up can lead to oil leaks, reduced engine performance, and increased emissions.

• 5085E
• 5090E
• 5090EL
• 5100E
• 5085M
• 5100M
• 5100MH
• 5100ML
• 5115ML
• 5090M
• 5115M
• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 5075M
• 6090MC
• 6090RC
• 6100MC
• 6100RC
• 6110MC
• 6110RC
• 310L/SL backhoes
• 450K/550K dozers

1. 1

   Inspect the Blow-By Filter for restriction or clogging.

2. 2

   Check ventilation hoses routing to and from the crankcase ventilation filter to ensure they are not kinked, blocked by sludge, or frozen.

3. 3

   Verify the integrity of the crankcase pressure sensor and its wiring harness for faults, shorts to ground, or open circuits.

4. 4

   Evaluate internal engine health for severe problems like worn piston rings or cylinder wear causing excessive blow-by.

1. 1

   Locate the Filter

   Locate the Open Crankcase Ventilation (OCV) / blow-by filter housing on the engine block.

2. 2

   Remove the Old Filter

   Disconnect the ventilation hoses attached to the filter housing. Remove the housing cover and extract the old blow-by filter element.

3. 3

   Clean and Inspect

   Wipe out the inside of the filter housing. Inspect the disconnected hoses for heavy oil sludge or blockages and clean them if necessary.

4. 4

   Install the New Filter

   Insert the new John Deere blow-by filter element into the housing and secure the cover. Reconnect all hoses tightly to prevent leaks.

5. 5

   Clear the Code

   Turn the ignition key off and back on to cycle the power. Use a diagnostic scan tool to clear the inactive 000101.00 code.

6. 6

   Test Run

   Run the engine under load. If the code returns immediately, you will need to perform a mechanical crankcase pressure test and a cylinder leak-down test to diagnose internal engine wear (e.g., piston rings).