What it means
The ECM detects a circuit low fault on the battery charger coupler temperature sensor c 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
Battery charger coupler temperature sensor C monitors the temperature at the charging connection. This low-circuit code means the module detects a signal lower than expected on sensor C's circuit, which can result from a short to ground, a shorted sensor, or a poor connector contact.
Common causes
Most likely first.
- Signal wire shorted to ground
- Internal sensor short
- Connector pins corroded - high contact resistance
Symptoms
- Charge status indicator shows fault
- Charging may not start or interrupts
- Slower-than-expected charge rate
How to diagnose it
- Record freeze-frame data and inspect live data for sensor C's temperature reading and any related charging or coupler faults.
- Compare sensor C's reading with the other coupler temperature sensors and ambient conditions to see whether it is implausibly low.
- Inspect sensor C's connector and harness for corrosion, damaged insulation, moisture, or a signal wire contacting ground.
- Test the sensor C signal circuit for a short to ground and check connector contact quality against the manufacturer's specification.
- If the harness passes, test sensor C itself and replace it only if it is confirmed shorted.
Common fixes
- Repair a signal wire shorted to ground in the sensor C circuit.
- Clean or repair corroded or damaged sensor C connector terminals.
- Replace sensor C if testing confirms an internal short.
- Clear the code and verify the reading and charging operation.
Can I keep driving?
The vehicle may restrict or interrupt charging because it cannot trust sensor C's coupler temperature signal. Stop charging and have the connection checked if the coupler is hot, damaged, or flagged with a temperature warning.
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.