U0100 on Cadillac vehicles A module has stopped hearing from the engine control module over the vehicle network
U0100 is named on 5 Cadillac model years (2017–2020): 23 manufacturer filings and 0 owner reports in NHTSA’s files, across Escalade, CT6.
Which Cadillac model years name U0100
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports |
|---|---|---|---|
| 2017 Cadillac Escalade | Electrical System | 9 | — |
| 2018 Cadillac Escalade | Engine | 6 | — |
| 2019 Cadillac Escalade | Electrical System | 4 | — |
| 2020 Cadillac Escalade | Electrical System | 2 | — |
| 2019 Cadillac CT6 | Electrical System | 2 | — |
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.
Cadillac filings that name U0100
Source: NHTSA manufacturer communicationsBulletins and campaigns Cadillac 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.
- PIT5405C Service bulletin2017-01-27 · Electrical 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 bulletin2017-10-02 · 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 bulletin2018-03-27 · 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
- PIT5586B Service bulletin2018-08-27 · Engine
- 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 bulletin2019-06-24 · 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
- PIT5586D Service bulletin2020-03-11 · 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
- PIC6342 Service bulletin2018-11-20 · Electrical System
- This Preliminary information communicates to the dealer technician that U0100 can currently set for a loss of communications with either the TCCM or the ECM and further diagnostics will be required to determine which module is at fault.
- PIC6342A Service bulletin2019-02-18 · Electrical System
- This Preliminary information communicates to the dealer technician that U0100 can currently set for a loss of communications with either the TCCM or the ECM and further diagnostics will be required to determine which module is at fault.
- PIT5586E Service bulletin2020-10-01 · 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
What U0100 means
Source: SAE J2012 / OBD-IIA module has stopped hearing from the engine control module over the vehicle network.
A stored code names the test that failed, never the part that caused it. The record above is what Cadillac and its owners have filed about it; the code’s page across every make has the whole file.
Common questions
Source: NHTSA files and the OBD-II standardIs U0100 a known problem on Cadillac vehicles?
It is a documented one: NHTSA's files hold 23 manufacturer filings and 0 owner reports naming U0100 on 5 Cadillac model years (2017–2020). Whether it is a problem on one particular car is a diagnosis, not a count — but a bulletin that names the code on your model year is the place to start.
Which Cadillac models does U0100 appear on most?
2017 Escalade (9 documents), 2018 Escalade (6 documents), 2019 Escalade (4 documents).
Does U0100 on a Cadillac mean it is recalled?
No. Recalls are filed by campaign and matched by VIN; no recall is triggered by a scan tool. Check the VIN at nhtsa.gov/recalls, or open the model year's page here for the campaigns filed against it.