What it means
The ECM detects a circuit fault on the dc/dc converter temperature sensor e circuit. Reading cannot be used reliably for control.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
Temperature sensor E monitors the DC/DC converter, which changes electrical power between voltage levels in a hybrid system. P2CA5 sets when the control module detects a fault in sensor E's circuit and cannot rely on its temperature reading for converter control.
Common causes
Most likely first.
- Sensor failed
- Wiring or connector fault
Symptoms
- Check-engine light or hybrid-system warning
- Reduced hybrid power or performance
- Hybrid-system temperature warning
How to diagnose it
- Record freeze-frame data and check hybrid-system warnings and available DC/DC converter temperature data to see when the circuit fault occurred.
- With the vehicle powered down according to its service instructions, inspect sensor E's connector and harness for damage, moisture, or loose connections.
- Check the connector terminals for corrosion, pushed-back pins, or poor contact.
- Use the vehicle wiring information to test sensor E's circuit and compare its reading with the manufacturer's specification.
- If the wiring and connections are sound, test sensor E and the converter-side circuit before considering module faults.
Common fixes
- Reconnect sensor E or clean and secure its connector terminals.
- Repair damaged wiring in the DC/DC converter temperature sensor E circuit.
- Replace sensor E if circuit testing confirms the sensor has failed.
- Repair the converter-side circuit only if testing confirms its fault.
Can I keep driving?
Because the hybrid system may limit power when converter temperature cannot be monitored, avoid long trips or heavy loads and heed any hybrid temperature warning. If a warning persists or power is reduced, stop somewhere safe and have the hybrid system checked.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.