P00C6 2018 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 2018 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 2018 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 2018 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 2018 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 2018 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 2018 GMC Sierra code?
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Need Help with the Code?
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Frequently Asked Questions about P00C6 2018 GMC Sierra Code
1. What are the common symptoms of OBDII code P00C6 on a 2018 GMC Sierra?
The common symptoms of code P00C6 include difficulty starting the engine, rough idling, and a noticeable decrease in engine power.
2. What does OBDII code P00C6 indicate in a 2018 GMC Sierra?
Code P00C6 indicates that the fuel rail pressure is low during engine cranking, meaning there may be an issue with the fuel delivery system.
3. What are the possible causes of OBDII code P00C6 on a 2018 GMC Sierra?
Possible causes of code P00C6 include a faulty fuel pump, clogged fuel filter, fuel pressure regulator problems, or issues with the fuel injectors.
4. How can I diagnose the cause of OBDII code P00C6 on my 2018 GMC Sierra?
Diagnosing code P00C6 may involve checking the fuel pressure using a gauge, inspecting the fuel pump and filter, and testing the fuel pressure regulator and injectors for proper function.
5. Can driving with OBDII code P00C6 on a 2018 GMC Sierra cause further damage?
Continuing to drive with low fuel rail pressure as indicated by code P00C6 can potentially damage the engine components, leading to more costly repairs in the long run.
6. How can I repair OBDII code P00C6 on a 2018 GMC Sierra?
Repairing code P00C6 may involve replacing a faulty fuel pump, cleaning or replacing the fuel filter, repairing or replacing the fuel pressure regulator, or servicing the fuel injectors.
7. Is it safe to ignore OBDII code P00C6 on a 2018 GMC Sierra?
It is not recommended to ignore OBDII code P00C6, as it can lead to poor engine performance, reduced fuel efficiency, and potential engine damage if left unresolved.
8. Can a DIY enthusiast fix OBDII code P00C6 on a 2018 GMC Sierra?
While some aspects of diagnosing and repairing code P00C6 may be within reach of a DIY enthusiast, it is recommended to consult a professional mechanic for accurate diagnosis and proper repair.
9. How much does it typically cost to fix OBDII code P00C6 on a 2018 GMC Sierra?
The cost to fix code P00C6 can vary depending on the underlying issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.
10. Will resetting the OBDII system clear code P00C6 on a 2018 GMC Sierra?
Resetting the OBDII system may temporarily clear the code, but if the root cause of low fuel rail pressure is not addressed, the code is likely to reappear after driving cycles.
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