P00C6 2017 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 2017 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 2017 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 2017 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 2017 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 2017 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 2017 GMC Sierra code?
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Frequently Asked Questions about P00C6 2017 GMC Sierra Code
1. What does the OBDII code P00C6 mean on a 2017 GMC Sierra?
P00C6 indicates that the fuel rail pressure is lower than expected during engine cranking, which can prevent the engine from starting or running properly.
2. What are the common symptoms of code P00C6 in a 2017 GMC Sierra?
Symptoms may include difficulty starting the engine, extended cranking times, rough idling, or a complete failure to start.
3. What causes the P00C6 code to appear in a 2017 GMC Sierra?
Common causes include a faulty fuel pump, a clogged fuel filter, a fuel pressure sensor malfunction, or an issue with the fuel injectors.
4. Can a bad fuel pump cause the P00C6 code?
Yes, a failing or weak fuel pump can result in insufficient fuel pressure during engine cranking, triggering the P00C6 code.
5. How can a clogged fuel filter lead to the P00C6 code?
A clogged fuel filter restricts fuel flow to the engine, causing low fuel rail pressure during cranking and setting the P00C6 code.
6. Is the P00C6 code related to the fuel pressure sensor on a 2017 GMC Sierra?
Yes, a malfunctioning or inaccurate fuel pressure sensor can misread fuel pressure levels and trigger the P00C6 code.
7. What should I check first when diagnosing the P00C6 code?
Start by inspecting the fuel pump, fuel filter, and fuel lines for blockages or leaks. Also, test the fuel pressure sensor for proper operation.
8. How is the P00C6 code typically repaired?
Repairs may involve replacing the fuel pump, cleaning or replacing the fuel filter, repairing fuel line leaks, or replacing the fuel pressure sensor.
9. Can a weak battery cause the P00C6 code on a 2017 GMC Sierra?
A weak battery can affect the fuel pump's performance during cranking, potentially contributing to low fuel pressure and the P00C6 code.
10. Is it safe to drive with the P00C6 code active?
Driving with the P00C6 code is not recommended, as low fuel pressure can cause engine stalling or prevent the vehicle from starting altogether.
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