GMC Acadia P0011: Camshaft Position "A" Timing Over-Advanced (Bank 1)

GMC Acadia P0011 Camshaft Timing Diagnosis

Quick Answer: What is P0011?

On a GMC Acadia, the P0011 code means the engine's computer has detected that the intake camshaft on Bank 1 is not in the position it should be. In the 3.6L V6 engine, this is almost always due to low engine oil level, dirty oil sludge clogging the VVT solenoids, or a stretched timing chain.

Severity: HIGH. If you hear a rattling or clicking sound from the engine, stop driving immediately. P0011 can be a warning sign that your timing chain is about to fail, which can lead to complete engine destruction on the 3.6L V6 platform.

Common Symptoms

Check Engine Light: On with code P0011.
Engine Rattle: A metallic noise coming from the timing cover area, especially on cold starts.
Loss of Power: The Acadia feels sluggish and lacks its usual throttle response.
Stalling: The engine may die when coming to a stop or while idling.

Most Likely Causes

Low or Dirty Engine Oil (50%): VVT systems rely on hydraulic oil pressure. If the oil is low or old, the system fails.
Faulty VVT Solenoid (25%): The electronic solenoid that controls oil flow to the cam phasers is stuck or clogged.
Stretched Timing Chain: A very common mechanical failure on GMC Acadia models with over 100k miles.
Faulty Camshaft Position Sensor: Sending incorrect data to the PCM.

Detailed Repair Cost Breakdown

Estimates for GMC Acadia (3.6L V6) in the US market:

Component / Task	Aftermarket Part	OEM ACDelco Part	Labor Time
VVT Solenoid replacement	$50 - $85	$120 - $170	1.0 - 1.5 hrs
Timing Chain Kit & Labor	$400 - $650	$1,100 - $1,500	10.0 - 15.0 hrs

How to Fix P0011 on a GMC Acadia

1. Check the Oil Dipstick IMMEDIATELY

The 3.6L V6 engine in the Acadia is known for consuming oil without showing smoke. If the oil level is even one quart low, the VVT solenoids will not have enough pressure to move the camshafts, triggering P0011. Top off the oil and clear the code; if it stays off, you've saved thousands of dollars.

2. Replace the VVT Solenoids (Actuators)

If the oil is full and clean, the solenoids are the next most likely culprit. These are located on the top/side of the cylinder heads. They often get clogged with fine metal particles or sludge. Replacing them with Genuine ACDelco units is a common and relatively easy fix.

3. Listen for the Timing Chain Rattle

If you have fresh oil and new solenoids but the P0011 code returns alongside a "rattle" noise when the engine is running, your timing chain has stretched. This is a major repair that requires removing much of the engine's front end. Do not ignore this, as a broken chain will destroy the entire engine.