U0100 on Chevrolet vehicles A module has stopped hearing from the engine control module over the vehicle network

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 U0100. Quote the document number at the service desk — it is a diagnosis the maker has already written down.

• PIT5586D Service bulletin
  2020-03-11 · Electrical System
• This Preliminary information communicates a customer concern of IPC gauges inoperative or fluctuate, No Start, No Crank, SIR Light / Service Airbag Message, Service Suspension Message, Radio display blank, Steering Wheel Controls (SWC) not illuminated, Turn Signal no audible feedback, HVAC controls inoperative. During diagnostics a technician may find any of the following DTC's: B1011, B1370, B398
• PIT5586E Service bulletin
  2020-10-01 · Electrical System
• This Preliminary information communicates a customer concern of IPC gauges inoperative or fluctuate, No Start, No Crank, SIR Light / Service Airbag Message, Service Suspension Message, Radio display blank, Steering Wheel Controls (SWC) not illuminated, Turn Signal no audible feedback, HVAC controls inoperative. During diagnostics a technician may find any of the following DTC's: B1011, B1370, B398
• PIT5713 Service bulletin
  2019-09-30 · Engine And Engine Cooling
• This Preliminary information communicates an issue with the engine wiring harness shorting at the left front cylinder head causing any of the following issues: -  IPC gauges sweeping while driving -  Several IPC warning messages and MIL displayed -  Any combination of the following DTC's: U0073 U0100 u0101 u0121 u0128 U0129 u0131 U0140 U0146 U0422 U2413 P0107 P0641 C2A07
• PIT5586B Service bulletin
  2018-08-27 · Equipment Adaptive/Mobility
• This Preliminary information communicates a customer concern ofIPC gauges inoperative or fluctuate, No Start,No Crank,SIR Light / Service Airbag Message, Service Suspension Message,Radio display blank, Steering Wheel Controls (SWC) not illuminated, Turn Signal no audible feedback,HVAC controls inoperative. During diagnostics a technician may find any of the following DTC's: B1011, B1370, B3980, U0
• PIT5586C Service bulletin
  2019-06-24 · Equipment — Electrical
• This Preliminary information communicates a customer concern of IPC gauges inoperative or fluctuate, No Start, No Crank, SIR Light / Service Airbag Message, Service Suspension Message, Radio display blank, Steering Wheel Controls (SWC) not illuminated, Turn Signal no audible feedback, HVAC controls inoperative. During diagnostics a technician may find any of the following DTC's: B1011, B1370, B398
• PIT5405C Service bulletin
  2017-01-27 · Steering — Electric Power Assist System
• This Preliminary Information communication provides information to the technician about vehicles that have a reduced or loss of power steering assist, steering wheel jerks or kicks back when turning, Service Stabilitrak message with warning chime, engine stall, Instrument Panel Cluster going blank or inoperative, radio/Integrated Center Stack going blank, Heater-Vent-Air Conditioning going blank,
• PIT5586 Service bulletin
  2017-10-02 · Equipment — Other — Owners/Service/Other Manual
• This Preliminary information communicates a customer concern ofIPC gauges inoperative or fluctuate, No Start,No Crank,SIR Light / Service Airbag Message, Service Suspension Message,Radio display blank, Steering Wheel Controls (SWC) not illuminated, Turn Signal no audible feedback,HVAC controls inoperative. During diagnostics a technician may find any of the following DTC's: B1011, B1370, B3980, U0
• PIT5586A Service bulletin
  2018-03-27 · Suspension
• This Preliminary information communicates a customer concern ofIPC gauges inoperative or fluctuate, No Start,No Crank,SIR Light / Service Airbag Message, Service Suspension Message,Radio display blank, Steering Wheel Controls (SWC) not illuminated, Turn Signal no audible feedback,HVAC controls inoperative. During diagnostics a technician may find any of the following DTC's: B1011, B1370, B3980, U0
• 19NA068 Service bulletin
  2019-04-04 · Electrical System
• This technical bulletin provides repair information to correct a customer concern of Malfunction Indicator Lamp (MIL) illuminated, intermittent service messages, and technician finding DTC?s U0073, U0121, U0100 and/or U0101 set.
• 19NA068 Service bulletin
  2019-11-12 · Electrical System
• This technical bulletin provides repair information to correct a customer concern of Malfunction Indicator Lamp (MIL) illuminated, intermittent service messages, Erratic Gauges and technician finding DTCs U0073, U0121, U0100 and/or U0101 set.
• 19NA068 Service bulletin
  2020-07-15 · Equipment Adaptive/Mobility
• This technical bulletin provides repair information to correct a customer concern of Malfunction Indicator Lamp (MIL) illuminated, intermittent service messages, Erratic Gauges and technician finding DTCs U0073, U0121, U0100 and/or U0101 set.
• 20NA206 Service bulletin
  2020-10-26 · Equipment
• This bulletin provides a procedure to replace the BCM and PSCM to correct a condition of Service Power Steering Message Displayed, U0100 Set will not Clear, Blown Fuse F9DA.

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.