AutoCodes – Generic – P1232

P1232 Code - Low Speed Fuel Pump Primary Circuit Failure

Quick Answer

P1232 indicates Low Speed Fuel Pump Primary Circuit Failure. Common causes include Faulty Low Speed Fuel Pump, Faulty Fuel Pump Relay, Low Speed Fuel Pump harness is open or shorted. 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: P1232 indicates Low Speed Fuel Pump Primary Circuit Failure.
Common causes: Common causes include Faulty Low Speed Fuel Pump, Faulty Fuel Pump Relay, Low Speed Fuel Pump harness is open or shorted.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 32,431

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 Jul 20, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1232 Description

OBDII Code P1232 - Low Speed Fuel Pump Primary Circuit Failure - AutoCodes.com — P1232 Code - Low Speed Fuel Pump Primary Circuit Failure

What does this mean?

What are the Possible Causes of the DTC P1232?

Faulty Low Speed Fuel Pump
Faulty Fuel Pump Relay
Low Speed Fuel Pump harness is open or shorted
Low Speed Fuel Pump circuit poor electrical connection
Damaged Powertrain Control Module (PCM)

How to Fix the DTC P1232?

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 does this mean?

Code Tech Notes

The Powertrain Control Module (PCM) monitors the Low Speed Fuel Pump (LFP) primary circuit output from the PCM. The test fails if: When the LFP circuit is commanded on (grounded), excessive current draw is detected on the LFP circuit; or when the LFP circuit is commanded off, voltage is not detected on the LFP circuit (the PCM expects to detect VPWR voltage coming through the low speed fuel pump relay coil to the LFP circuit).

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1232 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 P1232 code?

Need more information on how to fix the P1232 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1232 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1232 Audi — Injector Circuit Cylinder 8 Short To Ground
P1232 Chevrolet — Injector 4 Output Circuit
P1232 Ford — Low Speed Fuel Pump Primary Circuit Failure
P1232 GMC — Injector 4 Output Circuit
P1232 Land Rover — Low Speed Fuel Pump Primary Circuit Failure
P1232 Lincoln — Low Speed Fuel Pump Primary Circuit Failure
P1232 Mercury — Low Speed Fuel Pump Primary Circuit Failure
P1232 Mitsubishi — Throttle Actuator Control Circuit Fault
P1232 Volkswagen — Injector Circuit Cylinder 8 Short To Ground

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 P1232 Code

No Frequently Asked Questions about P1232 Code found.

Discuss the causes and fixes for P1232 OBDII Code

Submit a New Comment

Jagath Kumara
Date: January 16, 2025 at 9:37 pm

My 2001 Model V35 Skyline (VQ25DD- Engine)sedan car last week suddenly popup check engine, its comes RPM 650-850 within the range. No any power losses in engine, my mechanics scan after showing P1232 code.
We check Fuel pump regulator power is gone after check engine showing. We replace ECU and fuel pump relay but fault is not short it out.
Kindly help me to resolve this matter.
Thanks
Jagath

Reply to Comment
- OBDIITech
  Date: January 16, 2025 at 11:06 pm
  The P1232 code typically indicates an issue with the low-speed fuel pump primary circuit, which could involve wiring, connectors, the fuel pump control module, or the fuel pump itself. Here are some troubleshooting steps to help resolve the issue:
  1. Inspect Wiring and Connectors: Check for damaged, corroded, or loose wiring and connectors in the fuel pump circuit. Pay special attention to the fuel pump control module and the ground connections.
  2. Test the Fuel Pump Control Module: Ensure the control module is receiving and transmitting the proper signals. A faulty module can prevent the fuel pump from operating correctly.
  3. Verify Voltage Supply: Use a multimeter to check if the fuel pump is receiving proper voltage. No power reaching the fuel pump regulator, as you mentioned, suggests an issue upstream, such as a blown fuse, a bad relay (though you've replaced it), or a wiring fault.
  4. Inspect the Fuel Pump Itself: If the wiring, control module, and voltage supply are good, the fuel pump could be malfunctioning and may need replacement.
  5. Recheck the ECU: Even though you replaced the ECU, confirm it is programmed correctly for your vehicle and properly connected.
  Since you’ve already replaced the ECU and fuel pump relay, the next steps should focus on the wiring, fuel pump control module, and fuel pump. If you’re not confident handling electrical diagnostics, I recommend consulting a specialist familiar with Nissan Skyline vehicles.
  
  Let us know if you find anything in these areas!
  Reply to Comment