What it means
The ECM detects a circuit low 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, and the control module uses its signal to judge converter temperature. P2CA6 sets when the sensor E signal is lower than the circuit's expected range, a condition that can result from a signal short to ground, an internally shorted sensor, or poor connector contact.
Common causes
Most likely first.
- Signal wire shorted to ground
- Internal sensor short
- Connector pins corroded - high contact resistance
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 available converter temperature data and hybrid warnings to understand when the low signal appeared.
- With the vehicle powered down according to its service instructions, inspect sensor E's connector and wiring for chafing, damage, or contact with ground.
- Check connector pins for corrosion, looseness, or poor contact that could disrupt the signal.
- Use vehicle wiring information to test the signal wire for a short to ground and inspect sensor E's circuit continuity.
- Test sensor E against the manufacturer's specification to distinguish an internal short from a wiring fault.
Common fixes
- Clean and secure corroded or loose sensor E connector pins.
- Repair the signal wire if it is shorted to ground or damaged.
- Replace sensor E if testing confirms an internal short.
- Repair another confirmed fault in the sensor E circuit.
Can I keep driving?
The hybrid system may limit power because it cannot trust the DC/DC converter temperature reading. Avoid heavy loads and heed temperature warnings; stop somewhere safe if a warning persists or power falls.
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.