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John Deere 350G Excavator Overview
The John Deere 350G LC is a full-size hydraulic excavator designed for heavy-duty earthmoving, demolition, and utility trenching. Introduced in the early 2010s, the 350G is part of Deere’s G-Series lineup, which emphasizes fuel efficiency, emissions compliance, and operator comfort. With an operating weight of approximately 80,000 pounds and powered by a 271-horsepower Tier 4 Final diesel engine, the 350G features advanced hydraulic flow control and electronic diagnostics.
John Deere, founded in 1837, has long been a leader in agricultural and construction machinery. The G-Series excavators were developed to meet EPA emissions standards while maintaining productivity. The 350G uses a diesel particulate filter (DPF) system to reduce soot emissions, and its engine control unit (ECU) monitors various sensors to ensure proper operation.
Understanding Fault Code 3251.07
When a John Deere 350G fails to start and displays fault code 3251.07, the issue is typically linked to the DPF differential pressure sensor. This sensor measures the pressure difference across the DPF to determine soot load and trigger regeneration cycles. The code indicates that the sensor is reporting a pressure reading that is too high for ignition-on, engine-off conditions, which is not physically possible.
This abnormal voltage signal can prevent the ECU from allowing engine start, as it interprets the reading as a system fault that could damage the engine or emissions components.
Common Causes and Diagnostic Steps
Several factors can trigger fault code 3251.07:
Preventive Measures and Long-Term Reliability
To avoid future no-start conditions:
A no-start condition on the John Deere 350G excavator accompanied by fault code 3251.07 is most often caused by a faulty DPF differential pressure sensor or related wiring issues. Because the ECU relies on accurate sensor input to protect emissions systems, any abnormal voltage can trigger a shutdown. With proper diagnostics and preventive care, this issue can be resolved quickly, restoring full machine functionality and avoiding costly downtime.
The John Deere 350G LC is a full-size hydraulic excavator designed for heavy-duty earthmoving, demolition, and utility trenching. Introduced in the early 2010s, the 350G is part of Deere’s G-Series lineup, which emphasizes fuel efficiency, emissions compliance, and operator comfort. With an operating weight of approximately 80,000 pounds and powered by a 271-horsepower Tier 4 Final diesel engine, the 350G features advanced hydraulic flow control and electronic diagnostics.
John Deere, founded in 1837, has long been a leader in agricultural and construction machinery. The G-Series excavators were developed to meet EPA emissions standards while maintaining productivity. The 350G uses a diesel particulate filter (DPF) system to reduce soot emissions, and its engine control unit (ECU) monitors various sensors to ensure proper operation.
Understanding Fault Code 3251.07
When a John Deere 350G fails to start and displays fault code 3251.07, the issue is typically linked to the DPF differential pressure sensor. This sensor measures the pressure difference across the DPF to determine soot load and trigger regeneration cycles. The code indicates that the sensor is reporting a pressure reading that is too high for ignition-on, engine-off conditions, which is not physically possible.
This abnormal voltage signal can prevent the ECU from allowing engine start, as it interprets the reading as a system fault that could damage the engine or emissions components.
Common Causes and Diagnostic Steps
Several factors can trigger fault code 3251.07:
- Sensor failure: Internal short or voltage drift
- Wiring damage: Chafed wires, loose connectors, or corrosion
- Moisture intrusion: Water in the sensor plug or harness
- ECU misinterpretation: Software glitch or stored ghost codes
- Inspect the DPF differential pressure sensor for physical damage
- Check voltage at the sensor plug with ignition on—should be within 0.5–4.5V range
- Trace wiring from the sensor to the ECU for continuity and resistance
- Clear all stored codes and attempt restart
- If code reappears immediately, replace the sensor and retest
Preventive Measures and Long-Term Reliability
To avoid future no-start conditions:
- Inspect DPF sensors quarterly during scheduled maintenance
- Use dielectric grease on connectors to prevent corrosion
- Avoid pressure washing near sensor locations
- Keep software updated to ensure accurate fault interpretation
- Replace sensors every 3,000 hours or at signs of erratic readings
A no-start condition on the John Deere 350G excavator accompanied by fault code 3251.07 is most often caused by a faulty DPF differential pressure sensor or related wiring issues. Because the ECU relies on accurate sensor input to protect emissions systems, any abnormal voltage can trigger a shutdown. With proper diagnostics and preventive care, this issue can be resolved quickly, restoring full machine functionality and avoiding costly downtime.
