OBD Guide
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U1301

High Voltage On Class 2 Serial Data Circuit

U1301 is an OBD-II diagnostic trouble code meaning: High Voltage On Class 2 Serial Data Circuit. Common causes: short circuit in class 2 circuit, malfunction of one of the electronic modules. Estimated repair cost: $17–111.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–111 (est.)

Symptoms

  • Unstable operation of electronic systems
  • Loss of communication between modules
  • Malfunction indicator light comes on
  • Dashboard malfunctions

Causes

  • Short circuit in Class 2 circuit
  • Malfunction of one of the electronic modules
  • Problems with module power supply
  • Wiring harness damage

How to Fix

  1. Check voltage in Class 2 circuit
  2. Inspect the wiring harness for damage
  3. Check power supply of all connected modules
  4. Disable the modules one by one to identify the faulty one.

Related codes

U1300U1302U1303

FAQ

What does the U1301 code mean?

U1301 is an OBD-II diagnostic trouble code that indicates: High Voltage On Class 2 Serial Data Circuit

What causes a U1301 error code?

The most common causes of U1301 include: Short circuit in Class 2 circuit; Malfunction of one of the electronic modules; Problems with module power supply; Wiring harness damage.

How do I fix a U1301 diagnostic trouble code?

To fix U1301: Check voltage in Class 2 circuit. Inspect the wiring harness for damage. Check power supply of all connected modules. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1301?

Limited driving only, diagnose soon

How much does it cost to fix U1301?

The estimated repair cost for U1301 is $17–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat