What to do for 1996 GMC Safari Van with P0700 & P1192 codes?

Question

The engine light stays on. Temperature gauge always reads lower than normal.

Answer 1

P0700 transmission control system malfunction

P1192 Voltage external

When you get a P0700 it should be accompained by other transmission code as for P1192 you have insuffeinct power ground unit, The power ground is a significant ground, it is a specail ground, Look especially at the battery area, there is ground at the fram the corrodes very easy,