OBD Guide
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B1318

Battery Voltage Low

B1318 is an OBD-II diagnostic trouble code meaning: Battery Voltage Low. Common causes: low battery, faulty generator. Estimated repair cost: $6–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$6–167 (est.)

Symptoms

  • Slow engine start
  • Dim headlights
  • Warning messages on the dashboard
  • Unstable operation of electronic systems

Causes

  • Low battery
  • Faulty generator
  • Wiring Harness Problems
  • Battery terminal corrosion
  • Faulty relays or fuses

How to Fix

  1. Check battery voltage (should be ~12.6 V with engine off)
  2. Start the engine and check the voltage at the battery terminals (should be 13.5-14.5 V)
  3. Inspect battery terminals for corrosion and clean if necessary
  4. Check the condition of the alternator belt
  5. Test the generator on the stand
  6. Check the integrity of the wiring harness and connections

Related codes

P0562P0563U0121

FAQ

What does the B1318 code mean?

B1318 is an OBD-II diagnostic trouble code that indicates: Battery Voltage Low

What causes a B1318 error code?

The most common causes of B1318 include: Low battery; Faulty generator; Wiring Harness Problems; Battery terminal corrosion.

How do I fix a B1318 diagnostic trouble code?

To fix B1318: Check battery voltage (should be ~12.6 V with engine off). Start the engine and check the voltage at the battery terminals (should be 13.5-14.5 V). Inspect battery terminals for corrosion and clean if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1318?

Limited driving only, diagnose soon

How much does it cost to fix B1318?

The estimated repair cost for B1318 is $6–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat