New Holland 3825 – ECU: Short Circuit Over Load Error for H-bridge

The Engine Control Module (ECM) uses an internal "H-bridge" circuit to reverse the polarity and drive the Throttle Valve Actuator motor open and closed. This fault code triggers when the ECM detects that the H-bridge circuit is drawing excessive current (an overload/short circuit). This is typically caused by a short in the wiring harness, an internal electrical short within the TVA motor itself, or a physically jammed throttle valve that causes the motor to stall and pull high current.

• T4.55
• T4.65
• T4.75
• T4.85
• T4.95
• T4.105
• T4.115
• T4S.55
• T4S.65
• T4S.75
• T5.75
• T5.85
• T5.95
• T5.105
• T5.115
• WORKMASTER 50
• WORKMASTER 55
• WORKMASTER 60
• WORKMASTER 65
• WORKMASTER 70
• WORKMASTER 75
• B90B
• B95B
• B100C
• B110C
• L221
• L228
• L230
• C232
• C238

1. 1

   Check for related H-bridge fault codes (3820 to 3827) to help pinpoint if the short is to ground or to battery

2. 2

   Visually inspect the wiring harness leading to the electronic throttle body for chafing, melting, pinched wires, or corrosion

3. 3

   Disconnect and inspect connectors at the throttle body and ECU for bent, corroded, or pushed-out pins

4. 4

   Test for shorts to ground: verify there is no continuity between the H-bridge power/control wires and chassis ground

5. 5

   Test for shorts between wires: verify there is no continuity between the individual wires of the throttle body harness

6. 6

   Measure resistance across the two motor pins on the throttle body (an open circuit or a dead short indicates a faulty motor)

1. 1

   Perform diagnostic checks and repair wiring

   Perform all diagnostic checks to rule out a wiring or connection issue. If a wiring fault is found, repair the affected section of the harness.

2. 2

   Replace electronic throttle body

   If wiring and connectors are in good condition, the internal motor or circuitry is likely shorted. Disconnect the negative battery terminal and the electrical connector from the throttle body. Remove the air intake hose and unscrew the mounting bolts securing the throttle body to the intake manifold. Remove the old throttle body and clean the mounting surface of the intake manifold, ensuring no debris falls into the intake. Install the new electronic throttle body assembly with a new gasket (if applicable) and tighten the mounting bolts to the manufacturer's specified torque. Reconnect the air intake hose, electrical connector, and negative battery terminal.

3. 3

   Clear fault codes

   Use a diagnostic tool to clear the 3825 fault code from the ECU.

4. 4

   Perform relearn/calibration

   Initiate an electronic throttle body calibration or relearn procedure using a diagnostic tool, or by turning the ignition on for a set period required by the system before starting the engine. Start the engine and verify the code does not return.