AutoCodes – GMC – P1FD9 GMC

P1FD9 GMC Code - Hybrid/EV Battery Interface Control Module 5 Voltage Sensor Circuit Low Voltage

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: P1FD9 GMC indicates Hybrid/EV Battery Interface Control Module 5 Voltage Sensor Circuit Low Voltage.
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 768

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 P1FD9 GMC 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 P1FD9 GMC - Hybrid/EV Battery Interface Control Module 5 Voltage Sensor Circuit Low Voltage - AutoCodes.com — P1FD9 GMC Code - Hybrid/EV Battery Interface Control Module 5 Voltage Sensor Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1FD9 GMC?

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 P1FD9 GMC?

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 P1FD9 GMC 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 P1FD9 GMC code?

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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 P1FD9 GMC Code

What does the OBDII code P1FD9 mean for my GMC vehicle?

P1FD9 indicates a problem with the Hybrid/EV Battery Interface Control Module 5 Voltage Sensor Circuit, specifically that it is detecting low voltage.

What are the common symptoms associated with the P1FD9 code?

Common symptoms include warning lights on the dashboard, reduced hybrid or electric vehicle performance, and potential issues with battery charging or discharging.

What can cause the P1FD9 code to trigger?

Causes may include a faulty voltage sensor, wiring issues such as shorts or opens in the circuit, or problems with the Hybrid/EV Battery Interface Control Module itself.

How can I diagnose the P1FD9 code?

Start by using an OBDII scanner to confirm the code. Then, inspect the wiring and connectors related to the voltage sensor circuit for damage. Testing the voltage sensor's functionality may also be necessary.

What are the potential repairs for the P1FD9 code?

Repairs may involve replacing the faulty voltage sensor, repairing damaged wiring, or addressing issues with the Hybrid/EV Battery Interface Control Module.

Can I drive my GMC with the P1FD9 code?

It is not advisable to drive the vehicle with this code, as it may lead to further battery issues and decreased performance.

Is it safe to clear the P1FD9 code without repairs?

Clearing the code without addressing the underlying issue is not recommended, as the problem may persist and lead to more significant damage.

How much does it typically cost to repair the P1FD9 code?

Repair costs can vary widely depending on the specific issue, ranging from a few hundred dollars for a sensor replacement to more for module repairs or wiring fixes.

Should I consult a professional mechanic for the P1FD9 code?

Yes, consulting a professional is advisable to accurately diagnose and repair the issue, especially given the complexities of hybrid and electric vehicle systems.