What Error W013 Means
Error W013 on Yamaha PW series motors is a temperature warning, indicating that the drive unit or battery has detected operating temperatures outside safe limits. Unlike an overtemperature shutdown (E030), W013 is a warning — the system is approaching a thermal boundary but has not yet exceeded it. Motor assistance may be automatically reduced but is not necessarily cut entirely.
W013 can be triggered by both overheating (hot side) and by extreme cold (cold side). Both conditions affect the system differently.
Hot Side: Overheating
W013 appears during sustained high-load riding — extended climbs at maximum assistance, high ambient temperatures above 30 degrees C, or heavy cargo loads. The motor temperature has risen to a level where the system begins throttling assistance to prevent an E030 shutdown.
What to Do
Reduce assist level from the highest setting to a lower one. If riding a climb, shift to a lower gear to increase cadence — lower torque at higher RPM is far more thermally efficient than high torque at low RPM. If W013 persists, stop and allow the motor to cool for 10 to 15 minutes in shade before resuming.
Cold Side: Low Temperature
W013 also appears when the battery or motor is too cold — typically below minus 5 degrees C. Cold lithium cells have significantly reduced discharge capability, which can trigger voltage drops that the system flags as a thermal condition.
What to Do
Allow the battery to warm to above 0 degrees C before riding. Store the battery indoors overnight in cold weather and install it just before your ride. A battery at room temperature (20 degrees C) will provide significantly more range and eliminate cold-triggered W013 events.