OBD Guide
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P15F9

Hybrid/EV System Engine Speed Control Intervention Request Type Signal Message Counter Incorrect

P15F9 is an OBD-II diagnostic trouble code meaning: Hybrid/EV System Engine Speed Control Intervention Request Type Signal Message Counter Incorrect. Common causes: malfunction of the hybrid system control module, problems in the can bus (loss of communication between modules). Estimated repair cost: $56–278.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–278 (est.)

Symptoms

  • Power loss during transition between operating modes
  • Rough engine performance in hybrid mode
  • Check engine light comes on
  • Reduced performance of the hybrid system

Causes

  • Malfunction of the hybrid system control module
  • Problems in the CAN bus (loss of communication between modules)
  • Engine speed sensor malfunction
  • Damaged wiring or poor contacts
  • Software error in the control system

How to Fix

  1. Carry out diagnostics of the CAN bus and communication between modules
  2. Check the serviceability of the engine speed sensor
  3. Inspect and check the integrity of the wiring and connectors
  4. Update control module software if necessary

Related codes

P15F8P15FAU0121

FAQ

What does the P15F9 code mean?

P15F9 is an OBD-II diagnostic trouble code that indicates: Hybrid/EV System Engine Speed Control Intervention Request Type Signal Message Counter Incorrect

What causes a P15F9 error code?

The most common causes of P15F9 include: Malfunction of the hybrid system control module; Problems in the CAN bus (loss of communication between modules); Engine speed sensor malfunction; Damaged wiring or poor contacts.

How do I fix a P15F9 diagnostic trouble code?

To fix P15F9: Carry out diagnostics of the CAN bus and communication between modules. Check the serviceability of the engine speed sensor. Inspect and check the integrity of the wiring and connectors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P15F9?

Do not drive — repair immediately

How much does it cost to fix P15F9?

The estimated repair cost for P15F9 is $56–278. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat