U023C on 2021 Cadillac Escalade ESV — Lost Communication With Image Processing Module "C"
1 vehicles · 1 makes
Most Reported On
U023C is an OBD-II diagnostic trouble code meaning “Lost Communication With Image Processing Module "C".” A generic (SAE U0xxx block) network/communication code: the module reporting U023C has stopped receiving expected messages from Image Processing Module C (IPM-C/IPA-C), one of the camera/vision processing controllers used by driver-assistance features. The definition is standardized, though which physical camera module is designated "C" varies by vehicle. Camera-based features (lane keeping, forward collision warning, automatic emergency braking, surround/parking views) are typically disabled while it is active. It reports a loss of communication, not proof the camera itself has failed — other bus or battery/ignition codes should be diagnosed first, since diagnosing U023C ahead of them is a common misdiagnosis. This code is most commonly reported on 2021 Cadillac Escalade ESV.
Common Causes
Diagnostic Tools
This is a network/communication code. A basic engine-code reader will not show it — you need a scanner that reads all modules. These read U023C.
One caveat that applies to every scanner: only powertrain codes are standardised across manufacturers. Body, chassis and network coverage is "enhanced" diagnostics, and how deep it goes varies by make and model year — check your specific vehicle against the tool's coverage list before buying.
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level tablet with all-system coverage and bi-directional control, so you can command a module rather than only read it.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
What you can do yourself, and what needs a shop
Reading the code, clearing it, and watching whether it returns is a driveway job with the right scanner. These steps are not:
- Module programming or software updates — needs the manufacturer software or a J2534 pass-through with a paid subscription.
- Replacing a control module — most are VIN-programmed and immobilizer-registered, so a new one does nothing until it is coded to your car.
- Airbag/SRS component work — a stored fault can deploy a live device.
If the vehicle is still under warranty, check for an open recall or technical service bulletin before buying anything — the repair may already be covered.
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FAQ
What does U023C mean?
U023C stands for "Lost Communication With Image Processing Module "C"." A generic (SAE U0xxx block) network/communication code: the module reporting U023C has stopped receiving expected messages from Image Processing Module C (IPM-C/IPA-C), one of the camera/vision processing controllers used by driver-assistance features. The definition is standardized, though which physical camera module is designated "C" varies by vehicle. Camera-based features (lane keeping, forward collision warning, automatic emergency braking, surround/parking views) are typically disabled while it is active. It reports a loss of communication, not proof the camera itself has failed — other bus or battery/ignition codes should be diagnosed first, since diagnosing U023C ahead of them is a common misdiagnosis.
What are the most common causes of U023C?
The most common causes of U023C are: Blown fuse or loss of power/ground to the image processing module, Damaged, corroded, or loose connector at the camera/image processing module, Open, short, or high resistance in the CAN bus wiring to the module, Failed image processing module (internal fault), Missing programming/calibration after module replacement or a windshield/camera swap — a replacement module must be programmed and calibrated to the vehicle, Low system voltage or a weak battery causing modules to drop off the bus. The specific cause varies by vehicle.
How much does it cost to fix U023C?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by U023C?
Au7o has documented U023C across 1 vehicle models from 1 manufacturers: Cadillac.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.