GMC-specific code — factory diagnostic data| DTC Data Sheet | |
| Code | P0014 |
| Vehicle | GMC Sierra 1500 (2007-2019) |
| Engine | 4.8L / 5.3L / 6.2L V8 (Gen-IV, AFM) |
| System | VARIABLE VALVE TIMING |
| Fault type | Performance |
| Official meaning | Exhaust "B" Camshaft Position – Timing Over-Advanced (Bank 1) |
Definition source: GMC factory description. Diagnostic guidance is based on factory-defined fault logic for this code.
Decode any GMC Sierra 1500 VIN — free recalls, specs & safety ratings — free VIN decoder with NHTSA data
Looking for the cross-vehicle definition? Read the generic P0014 article for the SAE-defined fault logic that applies to all manufacturers.
P0014 Quick Answer
P0014 on a GMC Sierra means the exhaust camshaft drifted from the position the PCM commanded. The Sierra shares the Gen-IV LS engine family with the Silverado, so root causes are identical: dirty oil first, low oil pressure from AFM lifter wear second, stuck OCV solenoid third, with a failed cam phaser as the last suspect. An oil-and-filter service resolves about 50% of cases on this platform.
What Does P0014 Mean on a GMC Sierra 1500?
The GMC Sierra 1500 (2007-2019) shares the GMT900 / K2XX chassis and Gen-IV LS engine families with the Chevy Silverado 1500. P0014 root causes match the Silverado pattern exactly. The model-specific failure modes documented below apply to all Sierra trim levels using the same engine.
Symptoms
- Check Engine Light (P0014, often paired with P0011/P0017)
- Rough idle when cold
- Loss of power and fuel economy
- Cam phaser rattle on cold start (worn phaser)
- Possible misfires if timing drifts far enough
Common Causes (Most Likely on This Model First)
- Dirty / overdue oil. The cam phaser is hydraulic — depends on clean oil flowing through narrow passages. Sludge or extended changes (especially on AFM 5.3L) block flow. Service with dexos1 5W-30 first.
- Low oil pressure from AFM lifter wear. Worn AFM lifters drop overall pressure; phaser stops following commands at idle. Check hot idle pressure — should be ≥ 25 psi.
- Stuck OCV (Oil Control Valve / VVT solenoid). Carbon and varnish in the solenoid screen. Remove and inspect — $60-$120 replacement if damaged.
- Failed camshaft phaser. Genuine phaser failure is the LAST suspect. Bidirectional scan tool command should rotate phaser through range with ±2° actual tracking.
- Timing chain stretch. 100k+ Sierras can stretch enough to throw P0014/P0017 together.
Diagnostic Approach
- Inspect under the oil filler cap for sludge. Heavy sludge alone justifies an immediate oil service.
- Measure hot idle oil pressure. Below 20 psi = AFM lifter wear; address that first.
- Bidirectional OCV command — phaser should track within ±2°.
- Inspect OCV screen on removal for sludge or metal flake.
- Check timing chain stretch (cam/crank correlation scope) if OCV and oil are good.
- Replace phaser only after all the above are confirmed clean.
Possible Fixes
| Fix | When |
|---|---|
| Oil + filter service (dexos1 5W-30) | Sludge visible, oil overdue |
| OCV solenoid replacement | OCV won’t actuate or screen damaged |
| AFM lifter service / delete | Hot idle oil pressure below 20 psi |
| Timing chain + guides | Cam/crank correlation off by > 8° |
| Camshaft phaser replacement | Phaser doesn’t track commands |
Can I Still Drive With P0014?
Short-term yes. Sustained driving with a stuck phaser damages cam lobes — address within a few hundred miles.
How Serious Is This Code?
Moderate. P0014 almost always indicates oil-system trouble that compounds (sludge, AFM wear, low pressure).
Repair Costs
| Repair | Cost |
|---|---|
| Oil + filter service | $60 – $120 |
| OCV / VVT solenoid | $140 – $280 |
| Cam phaser replacement | $680 – $1,400 |
| Timing chain + guides | $1,200 – $2,200 |
| AFM-delete kit | $1,800 – $3,500 |
FAQ
Can dirty oil cause P0014 on a GMC Sierra?
Yes — about 50% of Sierra P0014 cases are resolved with an oil service. The cam phaser depends on clean oil flowing through narrow camshaft passages. Sludge from extended intervals blocks that flow. Service with dexos1 5W-30 first.
Is the Sierra P0014 the same as the Silverado?
Essentially identical. The Sierra 1500 and Silverado 1500 share the GMT900/K2XX chassis and Gen-IV LS engine family. P0014 root causes, diagnostic procedure, and fix costs match exactly.
How much does P0014 cost to fix on a Sierra?
Oil service: $60-$120. OCV solenoid: $140-$280. Cam phaser replacement: $680-$1,400. Timing chain service: $1,200-$2,200. AFM-delete (root cause for many high-mileage trucks): $1,800-$3,500.
Will P0014 damage my Sierra engine?
Sustained driving with a stuck phaser eventually wears cam lobes and lifters unevenly. A few hundred miles to get to a shop is fine; months of driving with P0014 active is not.