P00C6 on GMC: How to Diagnose & Fix
Fuel Rail Pressure Too Low - Engine Cranking
1 GMC model · 1 documented issue
P00C6 on GMC by model: symptoms, diagnosis and fix
GM tells technicians that the camshaft position actuator solenoid valve may stick or bind, holding the valve timing retarded, which can cause an intermittent crank-no-start with code P0011 and/or P00C6 stored. GM says the engine may sound like it is cranking fast and fuel rail pressure may read low while cranking. 2014-2019 GMC Sierra with the 4.3L V6 (LV3), 5.3L V8 (L83) or 6.2L V8 (L86), per GM preliminary information PIP5130K.
How to Fix
Have a qualified GM technician diagnose the no-start. PIP5130K has the technician use the scan tool to cycle the intake camshaft position actuator solenoid 4 or 5 times and try to start the engine; if it still will not start, the technician energizes the solenoid directly while cranking to free it. This is GM preliminary information for technicians, not a recall or a promise of free repair.
Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.
Sources for this issue (1)
P00C6 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P00C6 mean on a GMC?
P00C6 stands for "Fuel Rail Pressure Too Low - Engine Cranking." On direct-injection engines the PCM monitors high-pressure fuel-rail pressure during cranking. This code sets when the rail fails to reach the pressure required to start the engine, which usually results in extended cranking, hard starting, or a no-start. On GMC it is documented across 1 model: Sierra 1500.
What are the most common causes of P00C6?
The most common causes of P00C6 are: Weak or failing low-pressure (lift) fuel pump, Failing high-pressure fuel pump, Leaking or stuck fuel injector, Clogged fuel filter or restricted supply, Faulty fuel rail pressure sensor, Very low fuel level. The specific cause varies by vehicle.
How much does it cost to fix P00C6 on a GMC?
Repair costs vary widely with the root cause and GMC model; each issue on this page carries its own estimate where one is published.
Looking for P00C6 on a different make?
View P00C6 across all makes →Join 700+ subscribers following Au7o for vehicle insights and updates.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.