OBD Guide
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P1FE9

Hybrid/EV Battery Interface Control Module 1 Voltage Sensor Performance

P1FE9 is an OBD-II diagnostic trouble code meaning: Hybrid/EV Battery Interface Control Module 1 Voltage Sensor Performance. Common causes: faulty voltage sensor, wiring harness damage. Estimated repair cost: $56–167.

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

Symptoms

  • Hybrid system power reduction
  • Dashboard warning
  • Reducing electric range
  • Incorrect battery level readings

Causes

  • Faulty voltage sensor
  • Wiring harness damage
  • Problems with the battery management module
  • Contact corrosion
  • Grounding problems

How to Fix

  1. Check the condition of the wiring harness and contacts
  2. Test the voltage sensor
  3. Check system grounding
  4. Replace voltage sensor if necessary
  5. Update control module software (if required)

Related codes

P1FEAP1FEBP1FEC

FAQ

What does the P1FE9 code mean?

P1FE9 is an OBD-II diagnostic trouble code that indicates: Hybrid/EV Battery Interface Control Module 1 Voltage Sensor Performance

What causes a P1FE9 error code?

The most common causes of P1FE9 include: Faulty voltage sensor; Wiring harness damage; Problems with the battery management module; Contact corrosion.

How do I fix a P1FE9 diagnostic trouble code?

To fix P1FE9: Check the condition of the wiring harness and contacts. Test the voltage sensor. Check system grounding. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1FE9?

Limited driving only, diagnose soon

How much does it cost to fix P1FE9?

The estimated repair cost for P1FE9 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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