P00C6 2014 GMC Sierra Code - Fuel Rail Pressure Low During Engine Cranking
Quick Answer
The fuel rail pressure sensor detects fuel pressure within the fuel rail. Common causes include Faulty High Pressure Fuel Pump, Faulty Fuel Rail Pressure Sensor, High Pressure 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
- P00C6 2014 GMC Sierra indicates Fuel Rail Pressure Low During Engine Cranking.
- Common causes
- Common causes include Faulty High Pressure Fuel Pump, Faulty Fuel Rail Pressure Sensor, High Pressure 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.
Code P00C6 2014 GMC Sierra Description
High pressure fuel is regulated by the high-pressure fuel pump actuator, which is a part of the high-pressure fuel pump. The high-pressure fuel pump actuator is a solenoid valve. The ECM provides a voltage on the actuator high control circuit and ground on the actuator low control circuit. Both circuits are controlled through output drivers within the ECM. When deactivated, both drivers are disabled. When activated, the high control circuit driver energizes the high-pressure fuel pump actuator, and the low control circuit driver Pulse-Width Modulates (PWM) the low control circuit to ground.
The high-pressure mechanical fuel pump is driven by three lobes on the camshaft. The ECM uses the camshaft and crankshaft position sensor inputs to synchronize the high-pressure fuel pump actuator with the position of each of the camshaft lobes. The ECM regulates fuel pressure by adjusting the portion of each pump stroke that provides fuel to the rail.
The ECM monitors the fuel rail fuel pressure sensor and the high-pressure fuel pump actuator to determine if the commanded and actual pressure are within a predetermined range, or if the amount of fuel pressure correction exceeds a calibrated pressure.
The Diagnostic Trouble Code (DTC) will set if the ECM detects that the fuel pressure is not rising or has fallen beyond acceptable limits during engine cranking.
What are the Possible Causes of the DTC P00C6 2014 GMC Sierra?
- Faulty High Pressure Fuel Pump
- Faulty Fuel Rail Pressure Sensor
- High Pressure Fuel Pump harness is open or shorted
- High Pressure Fuel Pump electrical circuit poor connection
How to Fix the DTC P00C6 2014 GMC Sierra?
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 P00C6 2014 GMC Sierra 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 P00C6 2014 GMC Sierra code?
Need more information on how to fix the P00C6 2014 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
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Frequently Asked Questions about P00C6 2014 GMC Sierra Code
1. What are the common symptoms of OBDII code P00C6 in a 2014 GMC Sierra?
Low fuel pressure during engine cranking, hard starting, and potential engine misfires are common symptoms associated with code P00C6.
2. What are the possible causes of OBDII code P00C6 in a 2014 GMC Sierra?
Potential causes of code P00C6 include a faulty fuel pump, clogged fuel filter, fuel line blockage, or issues with the fuel pressure sensor.
3. How can I diagnose the cause of OBDII code P00C6 in my 2014 GMC Sierra?
Diagnosing code P00C6 involves checking the fuel pressure using a gauge, inspecting the fuel lines for blockages, testing the fuel pump operation, and examining the fuel pressure sensor for faults.
4. Can a clogged fuel filter trigger OBDII code P00C6 in a 2014 GMC Sierra?
Yes, a clogged fuel filter can restrict fuel flow to the engine, resulting in low fuel pressure during cranking and triggering code P00C6.
5. Is it safe to continue driving with OBDII code P00C6 illuminated in a 2014 GMC Sierra?
It is not recommended to drive with code P00C6 present, as low fuel pressure during engine cranking can lead to poor engine performance and potential damage if left unresolved.
6. How can I repair OBDII code P00C6 in my 2014 GMC Sierra?
Repairing code P00C6 may involve replacing the fuel filter, repairing or replacing the fuel pump, clearing any fuel line blockages, or addressing issues with the fuel pressure sensor.
7. Can weather or temperature affect the occurrence of OBDII code P00C6 in a 2014 GMC Sierra?
Extreme weather conditions or temperature fluctuations can sometimes exacerbate fuel delivery issues, potentially leading to low fuel pressure during engine cranking and triggering code P00C6.
8. Does code P00C6 in a 2014 GMC Sierra always indicate a serious issue with the fuel system?
While code P00C6 does point to a fuel system problem, it may not always be a severe issue. Prompt diagnosis and repair are recommended to prevent further complications.
9. Are there any preventive maintenance steps to avoid OBDII code P00C6 in a 2014 GMC Sierra?
Regularly replacing the fuel filter, using quality fuel, and ensuring timely fuel system inspections can help prevent issues that may lead to code P00C6 in your GMC Sierra.
10. Can a DIY enthusiast resolve OBDII code P00C6 in a 2014 GMC Sierra, or is professional assistance necessary?
Depending on the underlying cause, some DIY enthusiasts may be able to address code P00C6 by following repair guides and utilizing basic tools. However, complex issues may require professional assistance for proper diagnosis and repair.
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