If your John Deere Z335E displays Code E2, it’s important to understand what it means, what causes it, and how to fix it. This guide will help you troubleshoot the issue and get your mower running smoothly again.
John Deere Z335E Code E2
John Deere Z335E Code E2 typically indicates a PTO (Power Take-Off) switch or circuit malfunction. This code shows up on the mower’s display when the system detects an abnormality in the PTO switch’s status, usually when the switch is stuck in the “on” position during startup or the system senses a short/open circuit in the PTO electrical path.
The PTO switch is responsible for engaging and disengaging the mower blades. If there’s an issue with the switch or the wiring, the engine control module (ECM) will flag this with Code E2 to prevent the blades from engaging unexpectedly or failing to engage at all.
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Common Causes of Code E2 on Z335E
1. PTO Switch Stuck or Damaged
Over time, the mechanical contacts inside the PTO switch may wear out or stick in one position. If the switch is left in the “on” position when starting the engine, the system will throw an error.
2. Wiring Harness Issues
Loose, damaged, or corroded wires in the PTO circuit can break the communication between the switch and the control module. Rodents, water exposure, or vibration can damage the wiring.
3. Faulty PTO Clutch
If the clutch itself is faulty or drawing too much current, it can trigger Code E2. In rare cases, the coil inside the clutch can short out.
4. Control Module Fault
A failure in the mower’s control module or software glitches can sometimes misinterpret signals and throw an E2 code even when there’s no real issue.
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How to Fix John Deere Z335E Code E2
Step 1: Turn the PTO Switch Off and Restart
- The simplest fix is to ensure the PTO switch is in the OFF position before starting the engine.
- Turn the ignition key off, move the PTO switch to OFF, then try restarting the mower.
- If the code clears, the switch was simply left on during startup.
Step 2: Inspect the PTO Switch
- Remove the PTO switch from the dash panel and inspect it for physical damage, stickiness, or burnt terminals.
- Use a multimeter to test the switch’s continuity. Replace the switch if it fails the continuity test or feels mechanically faulty.
Step 3: Check the Wiring
- Inspect the PTO switch wiring harness for:
- Loose or disconnected connectors
- Pinched or frayed wires
- Corrosion or moisture inside the connectors
- Use dielectric grease on the connectors to prevent future corrosion.
Step 4: Test the PTO Clutch
- Using a multimeter, test the resistance across the PTO clutch terminals. It should typically read between 2 to 4 ohms.
- If it reads open or very low resistance (under 1 ohm), the clutch is likely shorted and needs replacement.
Step 5: Inspect Fuses and Relays
- Locate the fuse box under the seat or control panel and check all relevant fuses related to the PTO system.
- A blown fuse may indicate a short circuit.
Step 6: Reset the System
- After addressing the issue, disconnect the battery for about 5 minutes to allow the system to reset.
- Reconnect and turn the ignition on to see if the code returns.
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When to Call a Professional
If you’ve gone through all the steps above and the E2 code persists, it’s possible the issue lies deeper in the control module or wiring system that requires a John Deere technician with diagnostic tools to identify. It’s especially important not to bypass or “rig” the PTO switch for safety reasons.
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Preventing Future PTO Switch Errors
- Start the mower only with the PTO switch off. Make it a habit to check the position before turning the key.
- Regularly inspect and clean the wiring and connectors, especially if you store the mower outdoors.
- Keep the PTO clutch and belts in good condition. Any added strain on the clutch can increase the likelihood of electrical faults.
FAQs
What does E2 mean on a John Deere mower?
It means the PTO switch or circuit is faulty or engaged at startup. The system prevents operation to protect the blades and engine.
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Can I clear Code E2 without fixing the issue?
You may temporarily clear it by restarting the mower with the PTO switch off, but it will come back if the underlying problem isn’t resolved.
How much does it cost to fix Code E2?
Costs vary based on the part. A replacement PTO switch costs around $15–$30, while a new PTO clutch can range from $80–$150. Wiring or control module repair may cost more if done by a technician.
Is it safe to use the mower with the E2 code?
No. The mower will likely not allow the blades to engage, and if it does, it could pose a safety risk if the switch or clutch fails during operation.
How often do PTO switches fail?
PTO switches can last many years, but they are common wear items. Frequent use, exposure to moisture, or electrical overloads can shorten their life.
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Final words
Code E2 on the John Deere Z335E is not a rare issue and is usually tied to the PTO switch or its associated wiring. Fortunately, most fixes are simple and can be done at home with basic tools.
