OBD Guide
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U12B0

Power Supply Voltage Low

U12B0 is an OBD-II diagnostic trouble code meaning: Power Supply Voltage Low. Common causes: weak or dead battery, generator malfunction. Estimated repair cost: $6–56.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$6–56 (est.)

Symptoms

  • Unstable engine operation
  • Problems starting the engine
  • Dashboard flashing or turning off
  • Reduced power of electrical equipment

Causes

  • Weak or dead battery
  • Generator malfunction
  • Damaged or corroded wires
  • Poor contact in the power circuit
  • Faulty relays or fuses

How to Fix

  1. Check battery voltage
  2. Check generator operation
  3. Inspect wires and connections for damage
  4. Check relays and fuses
  5. Replace faulty components

Related codes

U12B1U12B2U12B3

FAQ

What does the U12B0 code mean?

U12B0 is an OBD-II diagnostic trouble code that indicates: Power Supply Voltage Low

What causes a U12B0 error code?

The most common causes of U12B0 include: Weak or dead battery; Generator malfunction; Damaged or corroded wires; Poor contact in the power circuit.

How do I fix a U12B0 diagnostic trouble code?

To fix U12B0: Check battery voltage. Check generator operation. Inspect wires and connections for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U12B0?

Yes, but get it checked soon

How much does it cost to fix U12B0?

The estimated repair cost for U12B0 is $6–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat