AutoCodes – Generic – P1178

P1178 Code - Fuel Pump Driver Control Module Sensor 1 Internal Supply Circuit

Quick Answer

The Fuel Pump Power Control Module is in constant communication with the Engine Control Module (ECM) regarding the operating state of the fuel pump power control system. Common causes include Faulty Fuel Pump Power Control Module, Fuel Pump Power Control Module harness is open or shorted, Fuel Pump Power 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: P1178 indicates Fuel Pump Driver Control Module Sensor 1 Internal Supply Circuit.
Common causes: Common causes include Faulty Fuel Pump Power Control Module, Fuel Pump Power Control Module harness is open or shorted, Fuel Pump Power 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 45,175

How popular is this code, among other codes? Medium

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 Jul 24, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1178 Description

The Fuel Pump Power Control Module is in constant communication with the Engine Control Module (ECM) regarding the operating state of the fuel pump power control system. Serial data messages are sent in a continuously repeating series of rolling counts with associated password protect samples. Each count/sample is assigned a value. When the ECM determines there is an error in the fuel pump control module fuel level sensor internal supply circuit, the ECM sets Diagnostic Trouble Code (DTC) P1178.

OBDII Code P1178 - Fuel Pump Driver Control Module Sensor 1 Internal Supply Circuit - AutoCodes.com — P1178 Code - Fuel Pump Driver Control Module Sensor 1 Internal Supply Circuit

What does this mean?

What are the Possible Causes of the DTC P1178?

Faulty Fuel Pump Power Control Module
Fuel Pump Power Control Module harness is open or shorted
Fuel Pump Power Control Module circuit poor electrical connection

How to Fix the DTC P1178?

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 P1178 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 P1178 code?

Need more information on how to fix the P1178 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1178 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1178 Audi — Linear Oxygen Sensor Pump Current Open Circuit
P1178 BMW — O2 Sensor Signal Circuit Slow Switching From Rich to Lean Bank 1 Sensor 1
P1178 Buick — Fuel Pump Driver Control Module Sensor 1 Internal Supply Circuit
P1178 Cadillac — Fuel Pump Driver Control Module Sensor 1 Internal Supply Circuit
P1178 Chevrolet — Fuel Pump Driver Control Module Sensor 1 Internal Supply Circuit
P1178 GMC — Fuel Pump Driver Control Module Sensor 1 Internal Supply Circuit
P1178 Hyundai — Electronic Throttle System Motor Battery Voltage Open
P1178 MINI — O2 Sensor Signal Circuit Slow Switching From Rich to Lean Bank 1 Sensor 1
P1178 Volkswagen — Linear Oxygen Sensor Pump Current Open Circuit

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.