Question

2009 Chevrolet Silverado with p0128 code temp gauge drops to zero and AC stops working what's the fix? Is it a quick fix

Answer 1

P0128 Engine coolant temperature below regulating temperature
With P0128 you need to replace the thermostat. which is the cause of P0128. If the problem with the a/c persist use a scan tool and gather the body code for the a/c unit.

Answer 2

P0128 CHEVROLET Code - Engine Coolant Temperature Below Thermostat Regulating Temperature

Read more: https://www.autocodes.com/p0128_chevrolet.html