New Holland 3512 – DCU: Dosing Control Unit Not Ready on Time

The Dosing Control Unit (DCU) has failed to become operational within the expected timeframe after the vehicle has been started. This indicates a malfunction within the Selective Catalytic Reduction (SCR) system, which can disrupt the proper injection of Diesel Exhaust Fluid (DEF) and affect emissions control functions.

• T4.100
• T4.110
• T4.120
• T4.100F
• T4.110F
• T5.110
• T5.120
• TK4.100
• TK4.100M
• 100A
• 120A
• 150A
• 170A
• B95C
• B95CLR
• B95D
• B110C
• B110D
• C245
• C334
• C345
• C362
• Farmall 100C
• Farmall 110C
• Farmall 120C

1. 1

   Check for other active fault codes to help diagnose the root cause

2. 2

   Check the DEF/AdBlue tank level and fluid quality, as low or contaminated fluid can trigger system faults

3. 3

   Inspect the DEF filter for clogs that can impede the flow of DEF

4. 4

   Inspect wiring and connectors at the Dosing Control Unit and associated sensors for visible damage, corrosion, or loose connections

5. 5

   Verify power and ground to the DCU to ensure it is receiving the correct voltage and has a solid ground connection

1. 1

   Replace Dosing Control Unit

   If diagnostic checks confirm a faulty DCU, replace the module. Ensure you verify the correct part number for your specific machine using its serial number.

2. 2

   Install software and program DCU

   Replacing the DCU requires software installation and programming, typically performed by an authorized dealer. CNH may require proof of troubleshooting before providing the necessary passwords.