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Diagnostic trouble code

U120C

U120C Fault Code

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Car Codes diagnostic trouble code

U120CDiagnostic priority

…: U11E3-00 - TCM Lost Communication With ESM On DPT CAN. B15A1-00 - Media Port 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 With Steering Wheel Cruise Control Switch. U1267-00 - No Valid Data From ESM On CAN-C Or CAN-DPT. U12A8 - Lost Communication With Master Cylinder Pressure…

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Code interpretation

What U120C 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.

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Driver experience

Symptoms you may notice

A stored diagnostic trouble code or a related system warning.

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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.

  1. Capture the evidenceSave the complete all-module scan, code suffixes and freeze-frame data.
  2. Prove the basicsTest battery condition, system voltage, power and grounds.
  3. Identify the reporterConfirm the module that logged the code and check circuit integrity.
  4. Compare live dataReview commanded and actual values under the conditions that set the code.
  5. Test before replacingUse model-specific wiring diagrams, pin tests and technical information.
  6. Verify the repairClear the code only after recording evidence, then confirm it does not return.

Vehicle fitment

Vehicle applicability

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.

A DTC is evidence, not a parts order.

Confirm the suffix, reporting module, model, year, engine and live data before replacing a component.

Verified public evidence

Manufacturer and model coverage

4 public manufacturer records match this search. These records support applicability research but do not replace VIN-specific workshop information.

U120CJeep Wrangler
WRANGLER 4XE · 2024 · Powertrain

…: U11E3-00 - TCM Lost Communication With ESM On DPT CAN. B15A1-00 - Media Port 1 Connection. U11C2 - Lost Transmission Message. U11E4-00 - CAN Communication Messages Missing. U120C -…

Source
U120CJeep Wrangler
WRANGLER 4XE · 2025 · Powertrain

…: U11E3-00 - TCM Lost Communication With ESM On DPT CAN. B15A1-00 - Media Port 1 Connection. U11C2 - Lost Transmission Message. U11E4-00 - CAN Communication Messages Missing. U120C -…

Source
U120CJeep Wrangler
WRANGLER · 2024 · Powertrain

…: U11E3-00 - TCM Lost Communication With ESM On DPT CAN. B15A1-00 - Media Port 1 Connection. U11C2 - Lost Transmission Message. U11E4-00 - CAN Communication Messages Missing. U120C -…

Source
U120CJeep Wrangler
WRANGLER · 2025 · Powertrain

…: U11E3-00 - TCM Lost Communication With ESM On DPT CAN. B15A1-00 - Media Port 1 Connection. U11C2 - Lost Transmission Message. U11E4-00 - CAN Communication Messages Missing. U120C -…

Source