P01E5Engine Coolant Temperature Sensor 3 Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- Coolant temperature sensor 3 is a third NTC coolant sensor on engines with thermal management or split cooling circuits; its position is defined by the manufacturer – on Jaguar Land Rover's 2018–2019 Ingenium petrol engines it sits in the engine block water jacket, on Audi's 3.0 TFSI V6 it is part of the thermal management. As with every NTC sensor, a low signal voltage means hot and a high one cold. CARB requires such additional sensors to be monitored from model year 2019 onwards. P01E5 means the signal voltage is too low, so the module would read an implausibly hot coolant – typically a signal wire shorted to ground, coolant or moisture in the connector, or an internally shorted sensor. No manufacturer document using exactly this code was found; it is described by analogy with its documented sibling codes and the NTC principle.
- What you may notice
- Check engine light on
- Coolant temperature or cooling fan behaviour possibly affected
- Often no change in driving
- Likely causes
- LikelySignal wire of sensor 3 shorted to ground (chafing, water in connector)
- PossibleSensor shorted internally
- PossibleCoolant in the connector, corrosion with leakage current
- RareControl module input stage faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €40 – €250
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.