OBD Guide
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P12BB

Cylinder 5 Injection Timing Related

P12BB is an OBD-II diagnostic trouble code meaning: Cylinder 5 Injection Timing Related. Common causes: malfunction of the fuel injector of cylinder 5, problems with the injector electrical circuit. Estimated repair cost: $17–89.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–89 (est.)

Symptoms

  • Unstable engine operation
  • Increased fuel consumption
  • Power Loss
  • Misfire in cylinder 5
  • Check Engine Light Illuminates

Causes

  • Malfunction of the fuel injector of cylinder 5
  • Problems with the injector electrical circuit
  • Engine control unit malfunction
  • Dirty or clogged nozzle
  • Mechanical damage to the fuel system

How to Fix

  1. Check the condition of the fuel injector of cylinder 5
  2. Diagnose the injector electrical circuit
  3. Clean or replace the nozzle if necessary
  4. Check the operation of the engine control unit
  5. Test the injection system on a bench

Related codes

P12BAP12BCP12BD

FAQ

What does the P12BB code mean?

P12BB is an OBD-II diagnostic trouble code that indicates: Cylinder 5 Injection Timing Related

What causes a P12BB error code?

The most common causes of P12BB include: Malfunction of the fuel injector of cylinder 5; Problems with the injector electrical circuit; Engine control unit malfunction; Dirty or clogged nozzle.

How do I fix a P12BB diagnostic trouble code?

To fix P12BB: Check the condition of the fuel injector of cylinder 5. Diagnose the injector electrical circuit. Clean or replace the nozzle if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P12BB?

Yes, but get it checked soon

How much does it cost to fix P12BB?

The estimated repair cost for P12BB is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat