OBD Guide
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U007C

Control Module Communication Bus J Off

U007C is an OBD-II diagnostic trouble code meaning: Control Module Communication Bus J Off. Common causes: open or short circuit in the can bus wiring, corrosion or oxidation of contacts in connectors. Estimated repair cost: $6–111.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$6–111 (est.)

Symptoms

  • The Check Engine Light or Other Warnings Is On
  • Failure of individual vehicle systems (climate control, multimedia, etc.)
  • Problems starting the engine
  • Incorrect operation of the dashboard
  • Lost connection with diagnostic equipment

Causes

  • Open or short circuit in the CAN bus wiring
  • Corrosion or oxidation of contacts in connectors
  • Malfunction of one of the electronic modules
  • Damage to CAN bus terminators
  • Problems with module power supply

How to Fix

  1. Visual inspection of the CAN bus wiring for damage
  2. Checking the CAN bus resistance (should be about 60 ohms between CAN-H and CAN-L)
  3. Checking the voltage on the CAN bus (2.5-3.5V on CAN-H and 1.5-2.5V on CAN-L)
  4. Disabling modules one by one to find the faulty one
  5. Checking the integrity of resistance terminators

Related codes

U007BU007DU007F

Error U007C by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the U007C code mean?

U007C is an OBD-II diagnostic trouble code that indicates: Control Module Communication Bus J Off

What causes a U007C error code?

The most common causes of U007C include: Open or short circuit in the CAN bus wiring; Corrosion or oxidation of contacts in connectors; Malfunction of one of the electronic modules; Damage to CAN bus terminators.

How do I fix a U007C diagnostic trouble code?

To fix U007C: Visual inspection of the CAN bus wiring for damage. Checking the CAN bus resistance (should be about 60 ohms between CAN-H and CAN-L). Checking the voltage on the CAN bus (2.5-3.5V on CAN-H and 1.5-2.5V on CAN-L). For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U007C?

Limited driving only, diagnose soon

How much does it cost to fix U007C?

The estimated repair cost for U007C is $6–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat