AutoCodes – GMC – P0230 GMC

P0230 GMC Code - Fuel Pump Relay Control Circuit

Quick Answer

When you turn the ignition switch to the ON position, the Powertrain Control Module (PCM) activates the in-tank fuel pump. Common causes include Faulty Fuel Pump Relay, Fuel Pump Relay harness is open or shorted, Fuel Pump Relay 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: P0230 GMC indicates Fuel Pump Relay Control Circuit.
Common causes: Common causes include Faulty Fuel Pump Relay, Fuel Pump Relay harness is open or shorted, Fuel Pump Relay 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 17,470

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0230 GMC Description

When you turn the ignition switch to the ON position, the Powertrain Control Module (PCM) activates the in-tank fuel pump. The fuel pump remains on as long as the PCM receives reference pulses from the electronic ignition system. If there are no reference pulses, the PCM turns the fuel pump off after about 2-3 seconds. The PCM controls the fuel pump relay by applying B+ to the control circuit via an internal switch called a driver. The primary function of the driver is to supply a voltage to the fuel pump relay. The driver has a fault line which the PCM monitors. When the PCM commands the fuel pump on, the voltage of the control circuit should be high (near battery voltage). When the PCM commands the control circuit to the fuel pump OFF, the voltage potential of the circuit should be low (near 0 volts). This DTC sets when the PCM detects the fuel pump control circuit is shorted to ground.

OBDII Code P0230 GMC - Fuel Pump Relay Control Circuit - AutoCodes.com — P0230 GMC Code - Fuel Pump Relay Control Circuit

What does this mean?

What are the Possible Causes of the DTC P0230 GMC?

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

How to Fix the DTC P0230 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 P0230 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.

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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 P0230 GMC Code

1. What does the OBDII code P0230 mean for a GMC vehicle?

P0230 indicates a problem with the fuel pump relay control circuit, which can disrupt the fuel pumpâ€™s proper operation.

2. What are common symptoms of code P0230 in GMC vehicles?

Common symptoms include engine stalling, difficulty starting, reduced engine performance, and, in some cases, a complete failure to start.

3. What causes the P0230 code in GMC vehicles?

Causes can include a faulty fuel pump relay, damaged wiring or connectors in the control circuit, a malfunctioning fuel pump, or a problem with the PCM (Powertrain Control Module).

4. How can I diagnose the P0230 code on my GMC vehicle?

Start by checking the fuel pump relay, inspecting wiring and connectors for damage, and using a multimeter to test the circuit for proper voltage and continuity.

5. Can a bad fuel pump relay trigger code P0230?

Yes, a failing or stuck fuel pump relay can cause the P0230 code by interrupting the control circuit.

6. Is it safe to drive a GMC vehicle with code P0230?

Driving with code P0230 is not recommended as it can lead to stalling or the inability to start the engine, potentially leaving you stranded.

7. How do I fix the P0230 code on a GMC vehicle?

Repairs may involve replacing the fuel pump relay, repairing or replacing damaged wiring, or addressing issues with the PCM if necessary.

8. Can a failing fuel pump cause the P0230 code?

Yes, a failing fuel pump can disrupt the control circuit and trigger the P0230 code.

9. How much does it cost to fix code P0230 on a GMC vehicle?

Repair costs can vary widely, ranging from $50 for a relay replacement to several hundred dollars if extensive wiring repairs or PCM replacement is required.

10. Will clearing the P0230 code solve the issue permanently?

Clearing the code may temporarily remove the error, but the underlying issue must be fixed to prevent the code from returning.