P0626

Symptoms

• The Check Engine light comes on
• Charging voltage is higher than normal (more than 14.8 V)
• Overheating and boiling of the battery
• Battery light is on
• Possible electronic failures due to high voltage

Causes

• Shorting the F terminal wire to the positive power wire
• Voltage regulator malfunction (stuck at maximum position)
• Open voltage regulator feedback circuit
• Internal ECU fault (maximum excitation signal)
• Short circuit in the generator excitation winding

How to Fix

1. Immediately measure the charging voltage - if the value is above 15 V, turn off the engine
2. Check terminal F wire for short to positive
3. Disconnect the terminal F wire from the generator - measure the charging voltage without a control signal
4. Check the voltage regulator - replace if faulty
5. Check the condition of the battery - is it boiling?
6. If the wire is ok, the regulator or ECU is faulty

Related codes

Error P0626 by Vehicle Brand