P0128 on Chevrolet vehicles The engine is not reaching its normal operating temperature in the expected time — usually the thermostat

A model year is listed because the code is named in its own record — a bulletin filed against it, or an owner’s complaint about it — not because every one of these vehicles sets it. Counts are documents in NHTSA’s files, not failure rates.

Bulletins and campaigns Chevrolet filed with NHTSA whose summary names P0128. Quote the document number at the service desk — it is a diagnosis the maker has already written down.

• 22-NA-054 Service bulletin
  2022-03-14 · Engine And Engine Cooling
• This technical bulletin provides repair information to correct a customer concern of a Check Engine Lamp Illuminated in the DIC (Driver Information Center), Temperature Gauge Inaccurate, and/or Cooling Fans Continue Running after Vehicle is Turned Off, with DTC P0128 Set.
• PIT5967 Service bulletin
  2023-01-04 · Steering
• This Preliminary information communicates that a vehicle may come to the dealer with a "Service Steering Message" and no codes set that pertain to the steering system. The technician is instructed to look for a P0128 and if it is set to diagnose that code and see if the message will clear.
• 17-NA-171 Service bulletin
  2017-10-01 · Equipment
• Hesitation, Stalling, Engine Speed Flare While Coasting, Unintended Acceleration Feel During a Parking Lot Maneuver, Reduced Surge in Low Speed Maneuvers, Stumble, Harsh Tip-In/Tip-Out, Park-Reverse-Drive Shift Concerns, Harsh Shifts, Erratic Shifts, Engine Vibration, Vibration, Buzz and/or Humming from Steering Wheel, Malfunction Indicator Lamp (MIL) Illuminated - DTC P0097, P054F, P24B1, P24C7,

A stored code names the test that failed, never the part that caused it. The record above is what Chevrolet and its owners have filed about it; the code’s page across every make has the whole file.