OBD Guide
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P15FB

External Engine Off Timer Incrementation Too Slow During Engine Running

P15FB is an OBD-II diagnostic trouble code meaning: External Engine Off Timer Incrementation Too Slow During Engine Running. Common causes: ecu malfunction, problems in the engine shutdown timer circuit. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Check Engine light comes on
  • Incorrect operation of the automatic engine shutdown system
  • Problems starting the engine
  • Reduced engine performance

Causes

  • ECU malfunction
  • Problems in the engine shutdown timer circuit
  • Faulty sensors associated with the timer
  • Software error in the engine control system

How to Fix

  1. Check the engine shutdown timer circuit for opens and short circuits.
  2. Check the operation of the sensors associated with the timer
  3. Update ECU software
  4. If necessary, replace the ECU

Related codes

P15FCP15FD

FAQ

What does the P15FB code mean?

P15FB is an OBD-II diagnostic trouble code that indicates: External Engine Off Timer Incrementation Too Slow During Engine Running

What causes a P15FB error code?

The most common causes of P15FB include: ECU malfunction; Problems in the engine shutdown timer circuit; Faulty sensors associated with the timer; Software error in the engine control system.

How do I fix a P15FB diagnostic trouble code?

To fix P15FB: Check the engine shutdown timer circuit for opens and short circuits.. Check the operation of the sensors associated with the timer. Update ECU software. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P15FB?

Yes, but get it checked soon

How much does it cost to fix P15FB?

The estimated repair cost for P15FB is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat