OBD Guide
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P16BC

Alternator FR Terminal Circuit/IGP Circuit Low Voltage

P16BC is an OBD-II diagnostic trouble code meaning: Alternator FR Terminal Circuit/IGP Circuit Low Voltage. Common causes: generator malfunction, damaged wiring or poor contact. Estimated repair cost: $56–167.

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

Symptoms

  • Battery charge indicator is on
  • Reduced voltage in the on-board network
  • Problems starting the engine
  • Flashing headlights or other electronic devices
  • Unstable engine operation at idle

Causes

  • Generator malfunction
  • Damaged wiring or poor contact
  • Faulty relays or fuses
  • Battery problems
  • Voltage regulator malfunction

How to Fix

  1. Check the voltage at the battery terminals with the engine running
  2. Inspect the wiring and connectors of the generator
  3. Check the condition of the relays and fuses
  4. Test the generator on the stand
  5. If necessary, replace the generator or voltage regulator

Related codes

P16BDP16BBP0562

FAQ

What does the P16BC code mean?

P16BC is an OBD-II diagnostic trouble code that indicates: Alternator FR Terminal Circuit/IGP Circuit Low Voltage

What causes a P16BC error code?

The most common causes of P16BC include: Generator malfunction; Damaged wiring or poor contact; Faulty relays or fuses; Battery problems.

How do I fix a P16BC diagnostic trouble code?

To fix P16BC: Check the voltage at the battery terminals with the engine running. Inspect the wiring and connectors of the generator. Check the condition of the relays and fuses. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P16BC?

Limited driving only, diagnose soon

How much does it cost to fix P16BC?

The estimated repair cost for P16BC is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat