P00C6 2016 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 2016 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 2016 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 2016 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 2016 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 2016 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 2016 GMC Sierra code?
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Frequently Asked Questions about P00C6 2016 GMC Sierra Code
1. What does the OBDII code P00C6 mean on a 2016 GMC Sierra?
P00C6 indicates "Fuel Rail Pressure Low During Engine Cranking," meaning the fuel rail pressure is insufficient during engine start-up.
2. What are the common symptoms of a P00C6 code?
Symptoms include extended cranking time before the engine starts, rough idle, reduced engine performance, or failure to start.
3. What causes the P00C6 code to appear?
Common causes include a faulty fuel pump, clogged fuel filter, leaking fuel injectors, low fuel pressure sensor failure, or issues with the fuel rail.
4. Can a dirty fuel filter trigger the P00C6 code?
Yes, a dirty or clogged fuel filter can restrict fuel flow and cause low fuel rail pressure during cranking.
5. How is the P00C6 code diagnosed?
A mechanic will use a scan tool to monitor fuel pressure during engine cranking, inspect the fuel system for leaks, and test components such as the fuel pump and pressure sensor.
6. Is it safe to drive with a P00C6 code?
Driving with a P00C6 code is not recommended, as it may lead to engine performance issues or prevent the vehicle from starting altogether.
7. How can I fix the P00C6 code on my 2016 GMC Sierra?
Repairs may involve replacing a faulty fuel pump, cleaning or replacing the fuel filter, repairing fuel system leaks, or replacing a defective fuel pressure sensor.
8. Can a weak battery cause the P00C6 code?
A weak battery can affect the fuel pump's performance during cranking, potentially contributing to low fuel rail pressure.
9. How much does it cost to repair a P00C6 code?
Repair costs vary depending on the issue but may range from $100 for a fuel filter replacement to over $500 for a new fuel pump.
10. Can the P00C6 code be caused by low fuel in the tank?
Yes, if the fuel level is extremely low, it can cause insufficient fuel pressure during cranking and trigger the P00C6 code.
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