AutoCodes – Volkswagen – P0231 Volkswagen

P0231 Volkswagen Code - Fuel Pump Secondary Circuit Low

Quick Answer

The Engine Control Module (ECM) provides ignition positive voltage to the coil side of the fuel pump relay. Common causes include Blown Fuel Pump fuse, Open Fuel Pump Monitor Circuit, Faulty Fuel Pump Relay. 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: P0231 Volkswagen indicates Fuel Pump Secondary Circuit Low.
Common causes: Common causes include Blown Fuel Pump fuse, Open Fuel Pump Monitor Circuit, Faulty Fuel Pump Relay.
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 6,379

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 13, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0231 Volkswagen Description

The Engine Control Module (ECM) provides ignition positive voltage to the coil side of the fuel pump relay. When the ignition switch is first turned ON, the ECM energizes the fuel pump relay, which applies power to the fuel pump. The ECM enables the fuel pump relay as long as the engine is cranking or running, and crankshaft reference pulses are received. If no crankshaft reference pulses are received, the ECM de-energizes the fuel pump relay after 2 seconds. The ECM monitors the voltage on the fuel pump relay control circuit.

OBDII Code P0231 Volkswagen - Fuel Pump Secondary Circuit Low - AutoCodes.com — P0231 Volkswagen Code - Fuel Pump Secondary Circuit Low

What does this mean?

What are the Possible Causes of the DTC P0231 Volkswagen?

Blown Fuel Pump fuse
Open Fuel Pump Monitor Circuit
Faulty Fuel Pump Relay
Damaged Engine Control Module (ECM)

How to Fix the DTC P0231 Volkswagen?

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 P0231 Volkswagen 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 P0231 Volkswagen code?

Need more information on how to fix the P0231 Volkswagen code? Get Access to Factory Service Manuals

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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 P0231 Volkswagen Code

1. What does OBDII code P0231 mean in a Volkswagen?

Code P0231 indicates a low voltage condition in the fuel pump secondary circuit, which may prevent the fuel pump from operating properly.

2. What are the common symptoms of code P0231 in a Volkswagen?

Symptoms may include engine stalling, failure to start, reduced fuel pressure, or poor engine performance.

3. What causes the P0231 code to appear in a Volkswagen?

Common causes include a faulty fuel pump relay, damaged wiring or connectors in the fuel pump circuit, a failing fuel pump, or a weak electrical ground.

4. How can I diagnose the P0231 code in my Volkswagen?

Start by checking the fuel pump relay, inspecting the wiring and connectors for damage or corrosion, and testing the fuel pump for proper functionality and voltage.

5. Can a bad fuel pump trigger the P0231 code in a Volkswagen?

Yes, a failing or non-functional fuel pump can cause the P0231 code by not maintaining the required voltage in the secondary circuit.

6. Is it safe to drive with a P0231 code on my Volkswagen?

Driving with this code can be unsafe, as it may cause the engine to stall or fail to start, potentially leaving you stranded.

7. How do I fix the P0231 code in a Volkswagen?

Repairs may include replacing a faulty fuel pump relay, repairing damaged wiring, ensuring proper electrical grounding, or replacing the fuel pump if necessary.

8. Can a blown fuse cause the P0231 code in a Volkswagen?

Yes, a blown fuel pump fuse can disrupt the circuit and trigger the P0231 code. Check all related fuses.

9. What tools are needed to troubleshoot the P0231 code in a Volkswagen?

You'll need a multimeter, a diagnostic scanner, and possibly a wiring diagram for your vehicle to test electrical components and circuits.

10. How much does it typically cost to fix a P0231 code in a Volkswagen?

Repair costs vary depending on the issue, but replacing a fuel pump relay might cost $50-$100, while a new fuel pump could cost $300-$600, plus labor.