What it means
The signals of the 14V power module current sensors A and B do not correlate within the calibrated tolerance.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
The 14-volt power module monitors current through two sensors, A and B, and compares their readings to check that the measurements agree. This code sets when the two signals differ beyond the calibrated tolerance, which may affect the module's view of 12-volt charging and electrical load.
Common causes
Most likely first.
- Fault in current sensor A or B
- Wiring, connector, or ground fault
Symptoms
- Check-engine or hybrid-system warning light on
- Charging-system warning light may come on
- 12-volt electrical system performance may be affected
How to diagnose it
- Record freeze-frame data and compare live current readings from sensors A and B with 12-volt system voltage and charging status.
- Inspect both current sensor connectors, their grounds, and nearby wiring for looseness, corrosion, damage, or poor terminal contact.
- Check for related charging or 12-volt supply codes that may help identify whether the mismatch follows sensor A, sensor B, or a shared circuit.
- Test each sensor's signal and ground circuits, then compare their readings under the same operating conditions using the manufacturer's procedure.
- If circuits and grounds are sound, test sensors A and B and the 14-volt power module input against the manufacturer's specification.
Common fixes
- Clean and secure a loose or corroded current sensor connector or ground.
- Repair damaged wiring in the affected sensor signal or ground circuit.
- Replace the faulty current sensor A or B identified by testing.
- Repair a confirmed 14-volt power module input or charging circuit fault.
Can I keep driving?
If the charging warning appears or 12-volt functions become unreliable, avoid unnecessary trips and switch off nonessential electrical loads. A charging fault can eventually leave the vehicle unable to power control systems or restart.
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.