Battery voltage above maximum level
1. Measure the supply voltage in the EEC control unit (E67) and compare it to that measured by the control unit. If the voltage measured by the control unit is significantly higher than the actual voltage, the control unit is faulty and must be exchanged. 2. Check for failures in other systems, which indicates faults that may lead to high supply voltage.
What you'll see
No driver-visible symptom recorded.
System reaction
Note: This fault shuts off the reductant flow in the system. This affects the cooling of the reductant dosing unit. Combined with high exhaust temperatures this could damage the reductant dosing unit.
Diagnostic depth
TECU indicates that battery voltage is above maximum allowed threshold
Electrical faults causing too high supply voltage to the EEC control unit (E67), for example generator failure. This fault can also be caused by use of some jump starting equipment