Car Codes diagnostic trouble code
…ion and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): U1046-00 - LIN 4 Bus. U0140-00 - Lost Communication With Body Control Module. U121E-00 - Lost Communication With Steering Wheel Cruise Control Switch. Customers may also comment on one or more of the following: Rear windshield wipers will continue to operate after the windshield wiper switch is turned to OFF. Electronic Vehicle Information Ce…
Code interpretation
What U121E-00 means
This code indicates Vehicle fault code with verified manufacturer evidence Its precise meaning depends on the reporting control module, complete failure-type suffix, model year, powertrain and software level.
Driver experience
Symptoms you may notice
A stored diagnostic trouble code or a related system warning.
Test, do not guess
Possible causes
The precise cause depends on the reporting module, vehicle specification, circuit condition and software level.
Evidence-led checks
Recommended diagnostic route
Save the complete scan and confirm the code against model-specific technical information before testing.
- Capture the evidenceSave the complete all-module scan, code suffixes and freeze-frame data.
- Prove the basicsTest battery condition, system voltage, power and grounds.
- Identify the reporterConfirm the module that logged the code and check circuit integrity.
- Compare live dataReview commanded and actual values under the conditions that set the code.
- Test before replacingUse model-specific wiring diagrams, pin tests and technical information.
- Verify the repairClear the code only after recording evidence, then confirm it does not return.
Vehicle fitment
Vehicle applicability
Jeep Grand Cherokee, Jeep Compass, Jeep Wrangler
Before clearing
Can the code be cleared?
Clearing a code without fixing the cause removes useful evidence and may only switch the warning off temporarily. Save the full scan first; a permanent or repeatedly returning code needs testing.
Confirm the suffix, reporting module, model, year, engine and live data before replacing a component.
Verified public evidence
Manufacturer and model coverage
14 public manufacturer records match this search. These records support applicability research but do not replace VIN-specific workshop information.
COMPASS · 2022 · Multiple/unspecified
…ion and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): U1046-00 - LIN 4 Bus. U0140-00 - Lost Communication With Body Control Module. U121E-00…
SourceCOMPASS · 2023 · Multiple/unspecified
…ion and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): U1046-00 - LIN 4 Bus. U0140-00 - Lost Communication With Body Control Module. U121E-00…
SourceCOMPASS · 2024 · Multiple/unspecified
…ion and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): U1046-00 - LIN 4 Bus. U0140-00 - Lost Communication With Body Control Module. U121E-00…
SourceGRAND CHEROKEE 4XE · 2022 · Multiple/unspecified
…the followingDiagnostic Trouble Codes (DTCs) may have set without a Malfunction Indicator Lamp (MIL) illumination: U1223-00 - Lost Communication with Wireless Charging Pad Module. U121E-00 - Lost Communication With Steering…
SourceGRAND CHEROKEE · 2021 · Multiple/unspecified
…not working. Upon further inspection the technician may also observe the following DTCs may have set withouta MIL: U1223-00 - Lost Communication with Wireless Charging Pad Module. U121E-00 - Lost…
SourceGRAND CHEROKEE 4XE · 2022 · Multiple/unspecified
…the followingDiagnostic Trouble Codes (DTCs) may have set without a Malfunction Indicator Lamp (MIL) illumination: U1223-00 - Lost Communication with Wireless Charging Pad Module. U121E-00 - Lost Communication With Steering…
SourceGRAND CHEROKEE · 2021 · Multiple/unspecified
…not working. Upon further inspection the technician may also observe the followingDTCs may have set without a MIL: U1223-00 - Lost Communication with Wireless Charging Pad Module. U121E-00 - Lost…
SourceGRAND CHEROKEE · 2021 · Multiple/unspecified
…not working. Upon further inspection the technician may also observe the following DTCs may have set withouta MIL: U1223-00 - Lost Communication with Wireless Charging Pad Module. U121E-00 - Lost…
SourceGRAND CHEROKEE 4XE · 2022 · Multiple/unspecified
…the followingDiagnostic Trouble Codes (DTCs) may have set without a Malfunction Indicator Lamp (MIL) illumination: U1223-00 - Lost Communication with Wireless Charging Pad Module. U121E-00 - Lost Communication With Steering…
SourceGRAND CHEROKEE 4XE · 2022 · Multiple/unspecified
…the followingDiagnostic Trouble Codes (DTCs) may have set without a Malfunction Indicator Lamp (MIL) illumination: U1223-00 - Lost Communication with Wireless Charging Pad Module. U121E-00 - Lost Communication With Steering…
SourceWRANGLER 4XE · 2024 · Powertrain
…rt 1 Connection. U11C2 - Lost Transmission Message. U11E4-00 - CAN Communication Messages Missing. U120C - Lost Brake Booster Signal. U1216-00 - Lost Communication With DASM. U121E-00 - Lost Communication…
SourceWRANGLER 4XE · 2025 · Powertrain
…rt 1 Connection. U11C2 - Lost Transmission Message. U11E4-00 - CAN Communication Messages Missing. U120C - Lost Brake Booster Signal. U1216-00 - Lost Communication With DASM. U121E-00 - Lost Communication…
SourceWRANGLER · 2024 · Powertrain
…rt 1 Connection. U11C2 - Lost Transmission Message. U11E4-00 - CAN Communication Messages Missing. U120C - Lost Brake Booster Signal. U1216-00 - Lost Communication With DASM. U121E-00 - Lost Communication…
SourceWRANGLER · 2025 · Powertrain
…rt 1 Connection. U11C2 - Lost Transmission Message. U11E4-00 - CAN Communication Messages Missing. U120C - Lost Brake Booster Signal. U1216-00 - Lost Communication With DASM. U121E-00 - Lost Communication…
Source