P1500/P1628
Read the instructions below then 
start the fault diagnostic procedure.
Symptom: Since incorrect battery voltage usually causes trouble in
other system functions, the diagnostic trouble codes are for
the most part generated together with other diagnostic
trouble codes. 
 
  
 
 
  
  
   
   
    
     Battery voltage too high or too low/Battery voltage +30 input
to control module incorrect.
    
    
     
    
    
   
   
  
   Fault symptom
  
  
   Since incorrect battery voltage usually causes trouble in
other system functions, the diagnostic trouble codes are for
the most part generated together with other diagnostic
trouble codes.
   
   
   
    Condition
   
  
  
   Voltage higher than 16 V (independent of time) or lower than
10 V for at least three seconds after starting.