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Engine-Codes – Generic – P1178

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

Quick Answer

The P1178 diagnostic trouble code refers to an issue with the Fuel Pump Driver Control Module Sensor 1 Internal Supply Circuit. Common causes include Faulty fuel pump driver control module, Wiring or connector issues in the internal supply circuit, Corrosion or damage to the fuel pump driver control module. 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 driver control module, Wiring or connector issues in the internal supply circuit, Corrosion or damage to the fuel pump driver control module.
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.
What is this?
Table of contents Created and updated by William Orellana on Aug 19, 2024
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Code P1178 Description

The P1178 diagnostic trouble code refers to an issue with the Fuel Pump Driver Control Module Sensor 1 Internal Supply Circuit. This means that there is a problem with the internal supply circuit within the fuel pump driver control module sensor 1. The fuel pump driver control module is responsible for regulating the fuel pump's operation, ensuring that the correct amount of fuel is delivered to the engine. When this circuit malfunctions, it can lead to issues with fuel delivery, potentially causing the vehicle to run poorly or even stall.

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

Common Causes of P1178

  1. Faulty fuel pump driver control module
  2. Wiring or connector issues in the internal supply circuit
  3. Corrosion or damage to the fuel pump driver control module
  4. Electrical system malfunctions
  5. Software issues with the control module

Symptoms of P1178

  1. Engine misfires or stalls
  2. Decreased fuel efficiency
  3. Difficulty starting the engine
  4. Engine hesitation or surging
  5. Illuminated check engine light

How to Fix P1178

  1. Diagnose the specific cause of the issue using a scan tool and multimeter
  2. Inspect the wiring and connectors for any damage or corrosion
  3. Replace the fuel pump driver control module if it is found to be faulty
  4. Clear the trouble codes and perform a test drive to ensure the issue is resolved
  5. If necessary, update the software of the control module

Cost to Fix P1178

Repair costs for a P1178 code can vary depending on the extent of the issue and the specific components that need to be replaced. In general, the cost for parts such as a new fuel pump driver control module can range from $200 to $600, while labor costs can be between $100 to $300. Overall, the total repair cost for this issue may be around $300 to $900. It is important to note that these are rough estimates, and actual costs may vary based on factors such as location and vehicle make and model. It is recommended to consult with a trusted mechanic for a more accurate cost estimate.

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Code P1178 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.

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