Unknown ECU Fault

An unidentified fault has been detected in the engine ECU that does not correspond to a defined standard code.

Possible causes

Outdated or corrupt ECU software
Electromagnetic interference in the wiring
Internal hardware failure in the engine controller
Unstable battery voltage or voltage spikes

Recommended actions

Perform a full power cycle (reset) of the unit
Check ground connections and battery terminals
Update ECU firmware to the latest version
Replace the ECU if the code becomes recurring or blocks starting

Can't find your code? Talk to an expert

$150

One-on-one phone session with a Low Temp refrigeration tech. Emergency temporary assistance only.

Email (opcional)

Teléfono (opcional)

¿Tienes un cupón?

I understand this is emergency temporary remote guidance only, no repair is guaranteed, I assume all risks, and Low Temp Service is not liable for cargo, engine, electrical, mechanical or accident damages. I accept the Terms & Conditions.

Have a question? Ask the community

Thousands of refrigeration mechanics read and answer for free. Post your case in under 1 minute.

Other Thermo King codes

00No Alarms Exist 02Check Evaporator Coil Sensor (Zone)03Check (Control) Return Air Sensor (Zone)04Check (Control) Discharge Air Sensor (Zone)05Check Ambient Temp Sensor 06Check Coolant Temp Sensor

View all Thermo King codes

Need a professional diagnosis?

Low Temp Service — refrigeration experts in Florida.