OBD Guide
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B1103

Communication Voltage Too Low

B1103 is an OBD-II diagnostic trouble code meaning: Communication Voltage Too Low. Common causes: wiring harness damage, bad contacts in connectors. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Incorrect operation of vehicle systems
  • Malfunction indicator light comes on
  • Problems starting the engine

Causes

  • Wiring harness damage
  • Bad contacts in connectors
  • Malfunction of one of the electronic modules
  • Problems with module power supply

How to Fix

  1. Check wiring harness for damage
  2. Inspect and clean the contacts in the connectors
  3. Check the module supply voltage
  4. Replace the faulty module if necessary

Related codes

B1101B1102B1104

FAQ

What does the B1103 code mean?

B1103 is an OBD-II diagnostic trouble code that indicates: Communication Voltage Too Low

What causes a B1103 error code?

The most common causes of B1103 include: Wiring harness damage; Bad contacts in connectors; Malfunction of one of the electronic modules; Problems with module power supply.

How do I fix a B1103 diagnostic trouble code?

To fix B1103: Check wiring harness for damage. Inspect and clean the contacts in the connectors. Check the module supply voltage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1103?

Limited driving only, diagnose soon

How much does it cost to fix B1103?

The estimated repair cost for B1103 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat