P00C6 GMC 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 GMC 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 GMC 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 GMC?
- 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 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 P00C6 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.
Need more information about the P00C6 GMC code?
Need more information on how to fix the P00C6 GMC code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P00C6 GMC code diagnosed by a professional: Find a repair shop in your area
Information for Specific GMC Models
- P00C6 2014 GMC Sierra — Fuel Rail Pressure Low During Engine Cranking
- P00C6 2015 GMC Sierra — Fuel Rail Pressure Low During Engine Cranking
- P00C6 2016 GMC Sierra — Fuel Rail Pressure Low During Engine Cranking
- P00C6 2017 GMC Sierra — Fuel Rail Pressure Low During Engine Cranking
- P00C6 2018 GMC Sierra — Fuel Rail Pressure Low During Engine Cranking
Frequently Asked Questions about P00C6 GMC Code
1. What are the common symptoms of OBDII code P00C6 in a GMC vehicle?
Symptoms may include difficulty starting the engine, rough idling, poor acceleration, and possibly stalling.
2. What are some possible causes of OBDII code P00C6 indicating low fuel rail pressure during engine cranking in a GMC?
Potential causes could be a faulty fuel pump, clogged fuel filter, fuel pressure regulator issue, or a leak in the fuel system.
3. How can I diagnose the underlying issue causing OBDII code P00C6 in my GMC?
Diagnosis typically involves checking the fuel pressure using a gauge, inspecting the fuel lines for leaks, testing the fuel pump, and examining the fuel filter and pressure regulator.
4. Can a DIY enthusiast repair OBDII code P00C6 related to low fuel rail pressure in a GMC?
Depending on the cause, some DIY repairs may be possible, such as replacing a fuel filter or pressure regulator. However, complex issues like a faulty fuel pump may require professional expertise.
5. Is it safe to continue driving with OBDII code P00C6 triggered in a GMC?
It is not advisable to drive with this code active, as low fuel rail pressure can lead to engine performance issues and potential damage over time. It's best to address the problem promptly.
6. Will resetting the OBDII code P00C6 in a GMC make the issue go away?
Simply clearing the code will not fix the underlying problem causing low fuel rail pressure. It's essential to diagnose and resolve the root cause to prevent future issues.
7. How much does it typically cost to repair OBDII code P00C6 in a GMC at a professional mechanic or dealership?
The cost of repair can vary depending on the specific cause of the issue, but it may range from a couple of hundred dollars for simpler fixes to over a thousand dollars for more complex repairs.
8. Can extreme weather conditions impact fuel rail pressure and trigger OBDII code P00C6 in a GMC?
Yes, extreme temperatures can affect fuel system components and lead to fluctuations in fuel pressure, potentially triggering the P00C6 trouble code.
9. Are there any preventive maintenance tips to avoid encountering OBDII code P00C6 in a GMC?
Regularly servicing the fuel system, using high-quality fuel, and addressing any unusual engine performance issues promptly can help prevent issues leading to low fuel rail pressure.
10. How urgent is it to address OBDII code P00C6 indicating low fuel rail pressure during engine cranking in a GMC?
While the vehicle may still be operable with this code, addressing it promptly is recommended to prevent further damage to the engine and ensure optimal performance and fuel efficiency.
Discuss the causes and fixes for P00C6 GMC OBDII Code
Code P00C6 GMC comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
