New Holland tractors are among the most popular and trusted machines in modern agriculture, combining durability with advanced electronic systems. But like any technology-driven equipment, these tractors sometimes display error codes indicating performance issues, sensor failures, or system faults.
This guide covers:
✅ Common New Holland tractor error codes and their meanings
✅ Model-wise troubleshooting for popular series (T4, T5, T6, T7, Workmaster, Boomer, etc.)
✅ Quick fixes and preventive tips to keep your tractor running smoothly
🔧 Understanding New Holland Tractor Error Codes
Modern New Holland tractors use digital diagnostic displays to alert operators of malfunctions in systems like:
- Engine and emissions
- Transmission and hydraulics
- PTO (Power Take-Off)
- Electronic control modules (ECMs)
- Fuel and DEF (Diesel Exhaust Fluid) systems
Each error code generally follows a pattern, such as:
Example: E4312 or SPN 1569 FMI 31
- SPN (Suspect Parameter Number) = the system or sensor affected
- FMI (Failure Mode Identifier) = what kind of fault it is (e.g., voltage too low, sensor open, etc.)
⚙️ Common New Holland Tractor Error Codes and Meanings
Here’s a breakdown of frequent error codes found across multiple New Holland tractor models:
| Error Code | Meaning | System | Fix |
|---|---|---|---|
| E4312 | DEF (AdBlue) system fault | Emissions | Check DEF tank level, heater, and pump; clean sensor |
| E110 | Low engine oil pressure | Engine | Stop engine, check oil level and pressure sensor |
| E402 | Fuel rail pressure too low | Fuel system | Check fuel filter, lines, and injector pump |
| E601 | Hydraulic oil temperature high | Hydraulics | Clean radiator, check fluid level and cooler fan |
| E903 | Battery voltage low | Electrical | Inspect alternator, battery, and cable connections |
| E1059 | PTO speed sensor fault | PTO | Replace or recalibrate sensor |
| E3205 | Transmission temperature too high | Transmission | Verify oil level, clean cooler, check solenoid |
| E876 | DPF regeneration required | Exhaust | Run forced regen or clean DPF |
| E1124 | Engine speed sensor fault | Engine | Replace speed sensor or inspect wiring harness |
| E1492 | Hydraulic pressure sensor out of range | Hydraulics | Replace sensor, inspect fluid quality |
🚜 Model-Wise New Holland Error Code Fixes
🔹 New Holland T4 Series (T4.65, T4.75, T4.90, T4.100, T4.110, T4.120)
These compact utility tractors often show E4 and E5 codes for emissions or fuel pressure faults.
Common Issues & Fixes:
- E4312 / DEF Fault: Clean DEF filter, inspect tank heater, and perform a manual regen.
- E402 (Fuel Pressure Low): Replace clogged fuel filter; ensure no air leaks in lines.
- E601 (Hydraulic Temp High): Clean hydraulic radiator fins and top off fluid.
- E903 (Battery Voltage Low): Clean terminals and check alternator belt tension.
🧠 Tip: The T4 series is sensitive to poor-quality DEF fluid—always use ISO 22241 standard fluid and keep the tank clean.
🔹 New Holland T5 Series (T5.85, T5.95, T5.105, T5.115, T5.120, T5.130)
Common Error Codes:
- E1346 (DPF Regeneration Needed) — Perform automatic or manual regen to clear soot buildup.
- E110 (Low Oil Pressure) — Replace oil filter and check pressure switch.
- E3205 (Transmission Overheat) — Clean oil cooler fins; verify hydraulic flow.
- E605 (DEF Quality Fault) — Drain contaminated DEF, flush lines, refill with clean fluid.
🧩 Fix Tip: The T5 series often benefits from regular ECM software updates—ask your dealer to check for calibration updates.
🔹 New Holland T6 Series (T6.145, T6.155, T6.165, T6.175, T6.180, T6.190)
These mid-range tractors feature advanced electronics and are prone to SPN/FMI emissions and communication errors.
Frequent Codes & Fixes:
| Code | Meaning | Solution |
|---|---|---|
| SPN 1569 FMI 31 | Engine Power Derate | Check DEF level, perform regen, clear soot filter |
| SPN 3364 FMI 18 | NOx Sensor Fault | Replace NOx sensor, inspect wiring |
| E876 | DPF Regen Needed | Initiate parked regeneration |
| SPN 157 FMI 3 | Boost Pressure Too High | Check turbo actuator and hoses |
🧠 Maintenance Tip: Clean the EGR valve and DPF filter regularly—clogging causes many false codes.
🔹 New Holland T7 Series (T7.175, T7.190, T7.210, T7.230, T7.245, T7.260)
These high-horsepower tractors use complex CAN-bus systems, leading to communication and emissions-related errors.
Common Codes & Fixes:
- E4312 / SPN 102 FMI 2: Boost pressure low — inspect turbo hoses for leaks.
- SPN 3556 FMI 16: SCR efficiency low — replace DEF injector or check catalyst.
- E903 (Low Battery): Test alternator output and main ground strap.
- E601 (Hydraulic Temp): Replace fan clutch if not engaging properly.
💡 Pro Tip: Perform a “key-on system reset” after clearing codes to reinitialize sensors.
🔹 New Holland Boomer Series (Boomer 25, 35, 40, 50, 55, 60)
Compact Boomer tractors use simplified sensors but still display E and SPN codes on their dash.
Common Codes:
| Code | Description | Fix |
|---|---|---|
| E310 | PTO fault | Recalibrate or replace PTO sensor |
| E110 | Oil pressure low | Check oil level and replace sensor |
| E402 | Fuel system issue | Clean filter and prime fuel system |
| E601 | Hydraulic temp | Replace fluid and clean radiator |
| E903 | Low voltage | Recharge or replace battery |
🧰 Tip: Boomer tractors often trigger false “low voltage” codes if the battery is over five years old.
🔹 New Holland Workmaster Series (Workmaster 25, 35, 40, 50, 60, 70, 75)
Simple yet reliable, these tractors often display basic diagnostic codes related to sensors and fluids.
Frequent Codes & Fixes:
- E110: Low oil pressure — check levels and replace filter.
- E402: Clogged fuel filter — change fuel and bleed system.
- E903: Weak battery — clean terminals and check alternator.
- E601: Hydraulic temperature — clean cooler and replace old oil.
- E3205: Transmission overheat — inspect fluid levels and cooler fan.
🧠 Fix Tip: Many Workmaster errors clear automatically after three full ignition cycles once the issue is fixed.
🔹 New Holland T8 and T9 Series (T8.300–T9.700)
These large-frame tractors integrate multiple ECUs, and communication errors (CAN faults) are most common.
Frequent Issues:
| Error | Description | Fix |
|---|---|---|
| SPN 520247 FMI 31 | Transmission control fault | Reset ECU or reflash software |
| SPN 3226 FMI 20 | SCR/DEF communication fault | Check harness connectors |
| E4312 | DEF pump fault | Replace pump or heater |
| E601 | Hydraulic overheat | Flush and replace fluid |
| SPN 1569 FMI 31 | Engine derate | Regenerate DPF or service injector |
🔧 Advanced Tip: Keep all ECUs on the latest software version — outdated firmware can trigger ghost codes.
🧩 How to Clear Error Codes on New Holland Tractors
- Identify the code: Note down SPN/FMI or E-codes from the dash.
- Fix the root issue: Don’t just clear it — address the actual cause (sensor, wiring, fluid, etc.).
- Use diagnostic tools:
- New Holland EST (Electronic Service Tool) — Dealer-level scan tool.
- Basic OBD-II with CAN adapter — Works for many post-2015 models.
- Clear the code: After repair, use the tool or perform an ignition key reset sequence.
- Re-test: Operate for 15–20 minutes and check if the fault reappears.
🧠 Preventive Maintenance Tips
To reduce the risk of repeated error codes:
✅ Change filters regularly — especially fuel, DEF, and hydraulic filters.
✅ Use clean DEF fluid and store it away from sunlight.
✅ Inspect electrical connections for corrosion or moisture.
✅ Run complete regen cycles instead of interrupting them.
✅ Keep radiator fins clean for proper cooling.
✅ Update software during annual dealer servicing.
❓ FAQs About New Holland Tractor Error Codes
Q1: Can I drive my tractor with an error code showing?
➡️ Minor alerts (like low voltage) might allow continued use, but engine or emissions codes should be fixed immediately to prevent damage or derating.
Q2: How do I know if my tractor needs regeneration?
➡️ If you see an E876 or DPF light blinking, your tractor needs a parked regen. Follow on-screen prompts or contact your dealer if it fails.
Q3: What causes constant E4312 DEF errors?
➡️ Usually contaminated DEF, faulty sensor, or frozen DEF tank. Clean or replace DEF components and refill with fresh fluid.
Q4: Are all New Holland error codes the same across models?
➡️ No. While some codes overlap, specific models (e.g., T7 vs Boomer) may assign different meanings to the same number. Always refer to your model’s service manual.
Q5: Can I clear codes without a diagnostic tool?
➡️ Yes, for some models. Turn ignition key ON for 60 seconds (without starting), then OFF for 30 seconds — repeat 3 times. This resets temporary codes.
Q6: Why does my tractor derate power suddenly?
➡️ That’s a limp mode triggered by emission system errors (SPN 1569). Complete a regeneration or fix DEF-related faults to restore full power.
Q7: Should I disconnect the battery to reset codes?
➡️ Only for non-critical electrical errors. Disconnecting may erase learned parameters — use proper clearing via diagnostic tools when possible.
🧰 Summary: Keeping Your New Holland Error-Free
| Task | Frequency | Benefit |
|---|---|---|
| Replace fuel & oil filters | Every 250 hours | Prevents fuel rail & pressure codes |
| Drain water separator | Monthly | Reduces injector faults |
| Clean radiator fins | Every 100 hours | Prevents overheating codes |
| Update software | Annually | Fixes communication and sensor issues |
| Use clean DEF | Always | Avoids DEF pump and quality codes |
By staying proactive, you can keep your New Holland tractor running efficiently and avoid recurring error codes, costly downtime, and emission derates.
I’m David man behind Lawn Mowerly; I’ve been dealing with lawnmowers and Tractors with my father since I was a kid. I know every make and model and what each one is capable of and love helping people find the perfect equipment for their needs.