What it means
The ECM detects a circuit fault on the dc/dc converter temperature sensor d 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
DC/DC converter temperature sensor D supplies the control module with a temperature signal for the converter that helps power the vehicle’s low-voltage electrical system from the high-voltage battery. This circuit code sets when the module detects an electrical fault that makes sensor D’s signal unusable or unreliable.
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
- Save freeze-frame data and scan for related hybrid or converter codes to see when the sensor D fault occurred and whether other circuits are involved.
- Use a compatible scan tool to read sensor D’s temperature and compare it with other available converter temperature readings and ambient conditions for an implausible or missing value.
- With the vehicle safely powered down according to its service procedure, inspect sensor D’s connector and harness for looseness, corrosion, chafing, or heat damage.
- Check sensor D’s signal, reference, and ground circuits for opens, shorts, or poor connections using the wiring information and manufacturer’s specification.
- If the wiring tests correctly, test sensor D according to the manufacturer’s procedure and replace it only if it fails.
Common fixes
- Reconnect or clean and secure sensor D’s connector if the contact is loose or contaminated.
- Repair damaged wiring or a poor ground in the sensor D circuit.
- Replace DC/DC converter temperature sensor D if it fails its specified test.
- Clear the code and verify that sensor D reports plausibly during operation.
Can I keep driving?
A faulty converter temperature signal can lead to reduced hybrid power or protective shutdown, so keep trips short and avoid heavy electrical loads if a temperature warning or power limit appears. Stop safely if the warning escalates or the vehicle loses power.
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.