AutoCodes – Generic – P1FF1

P1FF1 Code - Hybrid/EV Battery Interface Control Module 9 Voltage Sensor Performance

Quick Answer

The hybrid battery contains 192 individual cells. Common causes include Faulty Hybrid/EV Battery Interface Control Module, Hybrid/EV Battery Interface Control Module harness is open or shorted, Hybrid/EV Battery Interface Control Module circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1FF1 indicates Hybrid/EV Battery Interface Control Module 9 Voltage Sensor Performance.
Common causes: Common causes include Faulty Hybrid/EV Battery Interface Control Module, Hybrid/EV Battery Interface Control Module harness is open or shorted, Hybrid/EV Battery Interface Control Module circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 1,410

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 27, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1FF1 Description

The hybrid battery contains 192 individual cells. Two cells are welded together in parallel and called a cell group. There are a total of 96 cell groups in the hybrid battery assembly. These cell groups are electrically connected in series. Each individual cell group is rated at 3.7 V, for a nominal system voltage of 355 V direct current. The battery cell groups are joined to form 3 distinct sections. The first 24 battery cell groups make up battery section 1. This section is adjacent to the cowl and contains battery cell groups 73 through 96. The next 28 battery cell groups make up battery section 2. This section is located behind section 1 and contains battery cell groups 45 through 72. The transverse battery section is section number 3 and it contains the remaining 44 battery cell groups 1 through 44. The battery sections also contain two temperature sensors, with one sensor located at each end of the section.
The battery energy control module monitors the voltage of the 96 battery cell groups. The voltage sense lines are attached to each individual cell group, and these sense lines terminate at a connector located on the top surface of the battery section. A voltage sense harness joins this connector to the battery energy control module.
The battery energy control module contains internal interface control modules that monitor specific cell groups.
The battery energy control module will determine when a fault condition is present. Diagnostics and system status are communicated from the battery energy control module to the hybrid powertrain control module 2 through serial data. The hybrid powertrain control module 2 is the host controller for diagnostic trouble code information.

OBDII Code P1FF1 - Hybrid/EV Battery Interface Control Module 9 Voltage Sensor Performance - AutoCodes.com — P1FF1 Code - Hybrid/EV Battery Interface Control Module 9 Voltage Sensor Performance

What does this mean?

What are the Possible Causes of the DTC P1FF1?

Faulty Hybrid/EV Battery Interface Control Module
Hybrid/EV Battery Interface Control Module harness is open or shorted
Hybrid/EV Battery Interface Control Module circuit poor electrical connection

How to Fix the DTC P1FF1?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1FF1 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1FF1 code?

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Need Help with the Code?

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Information for Specific Makes

P1FF1 Buick — Hybrid/EV Battery Interface Control Module 9 Voltage Sensor Performance
P1FF1 Cadillac — Hybrid/EV Battery Interface Control Module 9 Voltage Sensor Performance
P1FF1 Chevrolet — Hybrid/EV Battery Interface Control Module 9 Voltage Sensor Performance
P1FF1 GMC — Hybrid/EV Battery Interface Control Module 9 Voltage Sensor Performance
P1FF1 Saturn — Hybrid/EV Battery Interface Control Module 9 Voltage Sensor Performance

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1FF1 Code

1. What does the OBDII code P1FF1 mean?

The P1FF1 code indicates a performance issue with the voltage sensor in the Hybrid/EV Battery Interface Control Module 9, which monitors voltage levels in the hybrid or electric vehicle's battery system.

2. What are the common symptoms of a P1FF1 code?

Symptoms may include an illuminated check engine light, reduced hybrid or EV performance, decreased fuel efficiency, or limited electric driving range.

3. What causes the P1FF1 code to appear?

Common causes include a faulty voltage sensor, wiring issues, a malfunctioning battery interface control module, or problems with the hybrid/EV battery itself.

4. Can I drive my car with a P1FF1 code?

While the vehicle may still be drivable, operating with this code can lead to reduced performance and could potentially damage the hybrid/EV battery system if not addressed promptly.

5. How do mechanics diagnose a P1FF1 code?

Mechanics use an advanced scan tool to read the code, inspect the voltage sensor and wiring for faults, and test the hybrid/EV battery system for irregularities.

6. What are the common fixes for the P1FF1 code?

Repairs may include replacing the voltage sensor, repairing or replacing damaged wiring, reprogramming the control module, or addressing issues in the hybrid/EV battery.

7. How much does it cost to fix a P1FF1 code?

Repair costs vary depending on the root cause, but they can range from $200 for sensor or wiring repairs to over $1,000 if the battery or control module needs replacement.

8. Can a P1FF1 code be caused by a low-voltage 12V battery?

Itâ€™s unlikely, as the code specifically relates to the hybrid/EV battery system, not the 12V battery. However, general electrical checks are always recommended.

9. Will clearing the P1FF1 code fix the problem?

Clearing the code may temporarily turn off the warning light, but the underlying issue must be resolved to prevent the code from returning.

10. Do I need to take my car to a dealership for a P1FF1 code?

While independent shops with hybrid/EV expertise may handle this issue, a dealership is often better equipped to diagnose and repair complex hybrid/EV battery problems.