John Deere 101.03 – ECU: Crankcase Pressure Signal Out of Range High

The signal voltage from the crankcase pressure sensor is abnormally high, which typically points to a short to 12 volts in the sensor's electrical circuit. This electrical fault distorts the actual crankcase pressure readings, which can cause the engine management system to make incorrect decisions or force the engine into a protective derate/shutdown mode to prevent perceived damage.

• 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
• 6100MC
• 7200R
• 7215R
• 8345R
• 9470RT
• 9520RT
• 9570RT
• 310K
• 310L
• 410K
• 410L
• 450K
• 550K
• 650K
• 130G
• 160GLC
• 210G
• 344K
• 544K
• 1070E
• 1170E
• T550
• W540
• W550
• R4040I
• R4050I

1. 1

   Consult the Component Technical Manual (CTM) for your exact engine model for baseline voltage specifications.

2. 2

   Visually and physically inspect the sensor wiring harness and connectors for signs of rubbing, melting, or wear that could cause a short to a 12-volt power source.

3. 3

   Use a multimeter or diagnostic equipment to test the crankcase pressure sensor circuit to confirm whether the high voltage signal is originating from an internal failure of the sensor itself or a wiring harness issue.

1. 1

   Isolate the Fault

   Based on the diagnostic tests, determine if the wiring harness is shorted or if the sensor has failed internally.

2. 2

   Repair or Replace

   If the wiring is damaged, repair the harness to eliminate the short to 12V. If the wiring tests fine but the sensor is outputting an out-of-range high signal, remove and replace the faulty crankcase pressure sensor.

3. 3

   Reassemble

   Install the new sensor (or repaired harness) ensuring secure, clean electrical connections to prevent moisture or debris intrusion.

4. 4

   Reset and Verify

   Clear the error codes from the ECU using a diagnostic tool. Run the engine and perform a comprehensive test to ensure the sensor accurately reflects crankcase pressure and the 000101.03 code does not return.