OBD Guide
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P12BC

Cylinder 5 Injection Timing Advance

P12BC is an OBD-II diagnostic trouble code meaning: Cylinder 5 Injection Timing Advance. Common causes: malfunction of the fuel injector of cylinder 5, problems in the injector control circuit. Estimated repair cost: $17–89.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–89 (est.)

Symptoms

  • Unstable engine operation
  • Power reduction
  • Increased fuel consumption
  • Dips during acceleration
  • Check Engine Light Illuminates

Causes

  • Malfunction of the fuel injector of cylinder 5
  • Problems in the injector control circuit
  • Nozzle contamination
  • Engine ECU malfunction
  • Problems with sensors affecting injection timing

How to Fix

  1. Check the condition of the fuel injector of cylinder 5
  2. Check the integrity of the injector control circuit
  3. Clean or replace the nozzle if necessary
  4. Check the operation of sensors that affect the injection moment
  5. If necessary, reflash or replace the engine ECU

Related codes

P12BBP12BDP12BE

FAQ

What does the P12BC code mean?

P12BC is an OBD-II diagnostic trouble code that indicates: Cylinder 5 Injection Timing Advance

What causes a P12BC error code?

The most common causes of P12BC include: Malfunction of the fuel injector of cylinder 5; Problems in the injector control circuit; Nozzle contamination; Engine ECU malfunction.

How do I fix a P12BC diagnostic trouble code?

To fix P12BC: Check the condition of the fuel injector of cylinder 5. Check the integrity of the injector control circuit. Clean or replace the nozzle if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P12BC?

Limited driving only, diagnose soon

How much does it cost to fix P12BC?

The estimated repair cost for P12BC is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat