When your Generac Evolution 1.0 or 2.0 series generator shows error code 1515, it means the system expected to see the engine spinning but didn’t receive any signal confirming this. This code is known as “RPM Sensor Loss” and triggers an alarm to alert you that the engine is not turning over as it should during startup.
This problem usually happens on single-cylinder units when the controller commands the starter to crank the engine, but the RPM sensor or related components fail to detect the engine’s rotation. Without this feedback, the generator cannot proceed with starting and will enter an alarm state.
Diagnostic Checklist
- Check the battery voltage and connections. A weak or dead 12V battery is a common cause. Use a multimeter to ensure the battery reads around 12.6 volts when fully charged. Also, inspect battery terminals for corrosion or loose connections and clean or tighten as needed.
- Inspect the starter and wiring. Look for any visible damage, loose connectors, or corrosion on the wiring harness going to the starter motor. A faulty starter or poor electrical connections can prevent the engine from cranking.
- Listen for starter operation. When you attempt to start the generator, does the starter motor engage and spin the engine? If you hear clicking or no sound at all, the starter or starter relay may be at fault.
- Examine the ignition coil and spark plug. Faulty ignition components can sometimes cause the engine not to start. Remove the spark plug and check for fouling or damage. Also, test ignition coil continuity if you have a multimeter.
- Inspect the RPM sensor wiring and connectors. Although less common, damaged wiring or loose connectors at the RPM sensor can cause loss of signal. Carefully trace the sensor wires and ensure they are intact and properly connected.
- Reset the generator controller. Sometimes, a simple reset by turning off the generator and disconnecting battery power for a few minutes can clear transient faults.
- Check for any engine mechanical issues. If the engine is seized or physically unable to turn, the RPM sensor will not detect rotation. Try manually turning the engine flywheel (if accessible) to confirm it moves freely.
When to Call a Pro
If you’ve gone through the checklist and the generator still won’t start or continues to display error code 1515, it’s time to contact a professional. Also, call a technician if you notice:
- The starter motor is not engaging at all despite a good battery.
- Repeated battery failures or charging system problems.
- Damaged or corroded wiring beyond your ability to safely repair.
- Engine mechanical issues such as seized parts or abnormal noises.
- The RPM sensor itself is suspected faulty and needs replacement.
Parts You May Need
- 12V battery
- Starter motor or starter relay
- Spark plug
- Ignition coil
- RPM sensor or wiring harness
- Battery terminal connectors and cleaning supplies
Frequently Asked Questions
What causes the RPM sensor loss error on a Generac generator?
This error occurs when the generator controller commands the engine to crank but does not receive a signal from the RPM sensor indicating that the engine is turning. Common causes include a dead battery, faulty starter, wiring issues, or ignition coil problems.
Can I fix error code 1515 myself?
Yes, many homeowners can perform basic checks such as testing the battery, inspecting wiring, and cleaning connections. However, if the problem involves starter replacement or sensor diagnostics, it may be best to call a professional.
Why does a bad battery cause this error?
A weak or dead battery may not provide enough power to engage the starter motor and crank the engine. Without engine rotation, the RPM sensor cannot send a signal back to the controller, triggering the error.
Is the RPM sensor easy to replace?
Replacing the RPM sensor can be straightforward if you have basic mechanical skills and the right tools. However, accessing the sensor and ensuring proper wiring may require some technical knowledge, so consult your generator’s manual or a technician if unsure.
Disclaimer: This article provides general information about error code 1515 on Generac Evolution series generators. Always consult your specific model’s manufacturer manual and follow safety guidelines before attempting any repairs.
Source: Information adapted from official manufacturer documentation (reference). Always consult your generator owner’s manual for model-specific procedures.
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