What it means
The positive contactor C of the battery charging system reports a control circuit range/performance condition. HV charging path cannot be commanded reliably.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
Positive contactor C is a high-voltage switch controlled by a coil circuit. The module checks whether the circuit's response matches its expected range and timing; this code sets when the measured response is outside the calibrated range or does not perform as expected.
Common causes
Most likely first.
- Coil resistance drifted
- High-resistance contact in connector
- Sensor element aged beyond calibration window
Symptoms
- Hybrid or EV system warning
- Charging may be limited or disabled
- Vehicle may not enter Ready mode
How to diagnose it
- Review freeze-frame data and related codes for the conditions when positive contactor C's control response went out of range.
- Compare scan-tool command, feedback, and any available control-circuit readings for positive contactor C during the fault.
- With the system made safe according to the manufacturer's procedure, inspect the contactor connector and wiring for looseness, corrosion, heat damage, or intermittent contact.
- Have a qualified technician measure positive contactor C coil resistance and compare it with the manufacturer's specification.
- If the coil and wiring check out, have the technician assess the module's output and feedback circuit for an out-of-range response.
Common fixes
- Repair a loose or high-resistance connection at the positive contactor C connector.
- Repair damaged or corroded control wiring to positive contactor C.
- Replace positive contactor C if its coil response is outside the manufacturer's specification.
- Repair the module output or feedback circuit if testing isolates the fault there.
Can I keep driving?
Charging may be limited or disabled, and the vehicle may not enter Ready mode. Avoid depending on the vehicle until charging and start-up are reliable; have high-voltage circuit checks performed by a qualified technician.
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.