Quick Answer
P0628 means: P0628 indicates a fuel pump control circuit issue, affecting engine performance.
Can I drive with P0628? Immediate inspection recommended to prevent further engine issues.
Common Questions
What does P0628 mean and how does it affect my car?
P0628 indicates a fuel pump control circuit issue, which can lead to poor engine performance. If unresolved, it may cause stalling or difficulty starting, affecting both safety and drivability.
What are the most common causes of P0628 and how much does it cost to fix?
Common causes include a faulty fuel pump, wiring issues, or a failing relay. Repair costs can range from $50 for a relay to $800 for a complete pump replacement.
Can I drive my car with P0628 or should I stop immediately?
It's not advisable to drive with a P0628 code as it may lead to stalling or failure to start. Immediate inspection is recommended to avoid safety risks.
How can I diagnose P0628 myself using GeekOBD APP?
Using the GeekOBD APP, scan for codes, view freeze frame data, and monitor fuel pump voltage during operation to help identify the issue.
What vehicles are most commonly affected by P0628?
Commonly affected vehicles include the 2007-2011 Chevy Silverado, 2008-2012 GMC Sierra, and various models from Ford and Toyota during similar production years.
How can I prevent P0628 from happening again?
Regular maintenance, including checking the fuel system and electrical connections, can help prevent P0628. Ensure you use high-quality fuel and address any performance issues promptly.
What is P0628?
The diagnostic trouble code P0628 indicates a problem with the fuel pump control circuit, which can lead to significant engine performance issues. This code is commonly found in various vehicles, including the 2007-2011 Chevrolet Silverado and the 2008-2012 GMC Sierra. When the Engine Control Module (ECM) perceives that the voltage in the fuel pump circuit is outside the expected range, it triggers this code. The fuel pump is essential for delivering fuel from the tank to the engine, and if the circuit malfunctions, the engine may hesitate, stall, or fail to start altogether. Additionally, the check engine light will usually illuminate, indicating that there is a problem that needs attention. Not addressing a P0628 code can lead to further issues, such as decreased fuel efficiency and potential engine damage due to fuel starvation. Car owners should take this code seriously, as it can impact vehicle safety and performance. If you experience this code, it’s advisable to diagnose the issue promptly to avoid further complications.
System: P - Powertrain (Engine, Transmission, Emissions)
Symptoms
Common symptoms when P0628 is present:
- The check engine light remains illuminated, alerting the driver to an issue that needs addressing.
- The engine may hesitate or stall during acceleration, leading to a frustrating driving experience.
- Fuel economy may decrease noticeably, with drivers reporting drops of 10-15% due to inefficient fuel delivery.
- Difficulties in starting the vehicle might occur, with the engine cranking but failing to turn over.
- Unusual noises, such as whining or humming from the fuel tank, may suggest a failing fuel pump.
Possible Causes
Most common causes of P0628 (ordered by frequency):
- The most common cause is a faulty fuel pump, which occurs in about 60% of cases, leading to inadequate fuel supply.
- Wiring issues, such as damaged or corroded connections, can disrupt the fuel pump circuit, causing a 20% likelihood of P0628.
- A faulty fuel pump relay might be to blame, and checking these components can help prevent future issues.
- Less common but serious causes include a malfunctioning ECM, which can misinterpret signals and lead to further complications.
- In rare circumstances, fuel contamination can affect the pump's operation, although this is less frequently encountered.
P0628 Repair Costs
Cost Breakdown by Repair Type
Fuel Pump Replacement
Replacing the faulty fuel pump can restore proper fuel delivery to the engine.
- Total: $400 - $800
- Success rate: 95%
Wiring Repair
Fixing damaged wiring or connectors to ensure proper voltage to the fuel pump.
- Total: $100 - $300
- Success rate: 85%
Fuel Pump Relay Replacement
Replacing a faulty fuel pump relay to restore proper circuit function.
- Total: $50 - $150
- Success rate: 90%
Money-Saving Tips for P0628
- Start with the most common and least expensive repairs first
- Use GeekOBD APP to confirm diagnosis before replacing expensive parts
- Consider preventive maintenance to avoid future occurrences
- Compare prices for OEM vs aftermarket parts based on your needs
- Address the issue promptly to prevent more expensive secondary damage
Diagnostic Steps
Professional P0628 Diagnosis Process
Follow these systematic steps to accurately diagnose P0628. Each step builds on the previous one to ensure accurate diagnosis.
Step 1: Step 1: Conduct an initial visual inspection to check for damaged wiring, loose connections, or corrosion around the fuel pump circuit
Step 1: Conduct an initial visual inspection to check for damaged wiring, loose connections, or corrosion around the fuel pump circuit.
Step 2: Step 2: Use the GeekOBD APP to perform an OBD2 scan and retrieve all codes along with freeze frame data to understand the fault context
Step 2: Use the GeekOBD APP to perform an OBD2 scan and retrieve all codes along with freeze frame data to understand the fault context.
Step 3: Step 3: Carry out component testing using a multimeter to check voltage and resistance in the fuel pump circuit
Step 3: Carry out component testing using a multimeter to check voltage and resistance in the fuel pump circuit.
Step 4: Step 4: Perform a system function test to verify proper operation after repairs and clear any trouble codes
Step 4: Perform a system function test to verify proper operation after repairs and clear any trouble codes.
Step 5: Step 5: Conduct a road test under various conditions to ensure the repair has been successful and the vehicle operates normally
Step 5: Conduct a road test under various conditions to ensure the repair has been successful and the vehicle operates normally.
Important Notes
- Always verify the repair with GeekOBD APP after completing diagnostic steps
- Clear codes and test drive to ensure the problem is resolved
- Address underlying causes to prevent code recurrence
Real Repair Case Studies
Case Study 1: Fuel Pump Replacement in a 2010 Chevrolet Silverado
Vehicle: 2010 Chevrolet Silverado, 85,000 miles
Problem: Customer reported the vehicle stalling during acceleration and a check engine light.
Diagnosis: Performed a diagnostic scan, retrieving code P0628. Inspected wiring and determined the fuel pump was failing.
Solution: Replaced the fuel pump and cleared the codes.
Cost: $650 (includes parts and labor)
Result: The vehicle ran smoothly post-repair with no further issues.
Case Study 2: Wiring Repair on a 2011 GMC Sierra
Vehicle: 2011 GMC Sierra, 90,000 miles
Problem: Driver experienced difficulties starting the engine and poor fuel efficiency.
Diagnosis: Found damaged wiring in the fuel pump circuit during visual inspection.
Solution: Repaired the wiring and tested the system for proper function.
Cost: $200 (including parts and labor)
Result: Restored normal operation, and the customer reported improved fuel economy.