What ECU Temperature measures
Every Haltech ECU has a temperature sensor built into the unit, and the firmware monitors it all the time. There's nothing to wire or calibrate. This isn't an engine sensor, it's a health check on the ECU itself. Electronics don't like heat, and an ECU that runs hot for long periods is more likely to have problems.
Setting DTC severity
If the internal temperature crosses an unsafe level, the ECU can raise a DTC. In the ECU Temperature node in NSP, you choose a severity level for each ECU Temperature DTC. That severity decides what happens:
- A low severity stores the fault so you can find it later in the logs.
- A higher severity ties it into your Engine Protection strategy, so the ECU responds with whatever protection action you've set for that level.
Our starting point is to at least store the fault on every car. On endurance and track cars, where the ECU may sit near heat for long sessions, we consider a protection response as well.
If you see this fault
Look at where the ECU is mounted before anything else. Common causes are mounting too close to exhaust or turbo heat, sitting in direct sun behind glass, or having no airflow around the case. Moving the ECU or adding heat shielding usually fixes it. Contact us if it keeps coming back.
