OBD Guide
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P16BB

Alternator 'B' Terminal Circuit Low Voltage

P16BB is an OBD-II diagnostic trouble code meaning: Alternator 'B' Terminal Circuit Low Voltage. Common causes: generator malfunction, damaged or corroded wiring. Estimated repair cost: $56–222.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–222 (est.)

Symptoms

  • Battery charge indicator is on
  • Reduced voltage in the on-board network
  • Dim headlights
  • Problems starting the engine
  • Unstable operation of electrical equipment

Causes

  • Generator malfunction
  • Damaged or corroded wiring
  • Poor contact at terminals
  • Voltage regulator malfunction
  • Open or short circuit in the circuit

How to Fix

  1. Check the voltage at the battery terminals with the engine running
  2. Inspect wiring and connections for damage and corrosion
  3. Check the condition of the generator and its drive belt
  4. If necessary, replace the generator or voltage regulator
  5. Clean and tighten all connections in the circuit

Related codes

P16BCP16BAP0562

FAQ

What does the P16BB code mean?

P16BB is an OBD-II diagnostic trouble code that indicates: Alternator 'B' Terminal Circuit Low Voltage

What causes a P16BB error code?

The most common causes of P16BB include: Generator malfunction; Damaged or corroded wiring; Poor contact at terminals; Voltage regulator malfunction.

How do I fix a P16BB diagnostic trouble code?

To fix P16BB: Check the voltage at the battery terminals with the engine running. Inspect wiring and connections for damage and corrosion. Check the condition of the generator and its drive belt. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P16BB?

Limited driving only, diagnose soon

How much does it cost to fix P16BB?

The estimated repair cost for P16BB is $56–222. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat