What it means
The control circuit of the HV battery precharge contactor A reports a control circuit low condition. Precharge sequence 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
Precharge contactor A is switched by a control circuit so the DC link can charge before the main battery contactors close. P0AE6 sets when the control module detects a signal below the expected range in contactor A's circuit, which can indicate a short to ground or a shorted coil. Precharge may not complete reliably.
Common causes
Most likely first.
- Control wire shorted to ground
- Internal short in coil
- Connector pins corroded - high contact resistance
Symptoms
- EV/hybrid system warning light on
- Reduced power output or limp mode
- Charging may fail or be slowed
- Reduced electric range
How to diagnose it
- Review freeze-frame and live data for contactor A's command and circuit status to confirm when the low condition occurs.
- With the vehicle safely powered down, inspect contactor A's control wire for chafing or a short to ground and check its connector pins for corrosion.
- Test contactor A's control wire for an unintended ground using the manufacturer's procedure.
- Measure contactor A coil and circuit resistance against the manufacturer's specification to check for an internal short or poor connection.
- If wiring and coil tests pass, compare commanded and reported contactor A operation with a capable scan tool and investigate the control module circuit.
Common fixes
- Clean and secure corroded contactor A connector pins.
- Repair contactor A's control wire if it is shorted to ground.
- Replace precharge contactor A if its coil is shorted or outside specification.
- Repair the control module circuit if testing identifies it as the source.
Can I keep driving?
Avoid routine or long-distance driving because reduced power, limp mode, or failure to enter Ready mode may occur. Arrange prompt diagnosis since precharge and charging may be unreliable.
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.