P06DD on GMC: How to Diagnose & Fix
Engine Oil Pressure Control Circuit Stuck Off
1 GMC model · 1 documented issue · 1 critical · $3,500-$8,000 repair
P06DD on GMC by model: symptoms, diagnosis and fix
The GMC Yukon 5.3L (L83, LC9, LMG) and 6.2L (L94, L86) V8 engines use Active Fuel Management (AFM) cylinder deactivation. The special collapsible AFM lifters on cylinders 1, 4, 6, and 7 fail prematurely, causing misfires, engine ticking, rough idle, and potential catastrophic damage. This is the single most reported mechanical failure on GMT900 (2007-2014) and K2XX (2015-2020) Yukon models. GM issued diagnostic bulletins PIP4568 (2007-2014 AFM V8s) and PIP5259 (2014-2015 Yukon) covering collapsed or stuck AFM lifters. Yukon models used as daily drivers with lots of highway cruising (where AFM activates most) are most susceptible. On 2007-2014 engines the VLOM (Valve Lifter Oil Manifold), which controls oil flow to the AFM lifters, is replaced along with the lifters per PIP4568.
Common Symptoms
- Misfire codes P0300, P0301, P0304, P0306, P0307
- Engine tick or tap at idle that worsens with load
- Rough idle or engine vibration
- Check engine light
- Reduced engine power / limp mode
- Metal debris in oil (confirmed on drain plug inspection)
- Vibration between 30-55 mph during V4 deactivation mode
How to Fix
Replace the AFM lifters and plastic lifter guides and inspect camshaft lobes; PIP4568 (2007-2014) also calls for the VLOM (GM 12639516), while PIP5259 (2014-2015) calls for the AFM lifters and guide on the affected bank plus the oil pump and oil pan. AFM delete kit (Texas Speed or BTR) permanently eliminates the system. Range Technology AFM Disabler RA003B prevents AFM activation as a preventive measure. Change oil every 5,000 miles with Dexos1 Gen 2 full synthetic to protect lifters.
Sources for this issue (2)
P06DD 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 P06DD mean on a GMC?
P06DD stands for "Engine Oil Pressure Control Circuit Stuck Off." This code applies to engines with an electronically controlled, variable oil pump, where a solenoid (oil control valve) switches the system between low- and high-pressure modes based on engine needs. 'Stuck Off' means the computer commanded the solenoid but the system did not respond, so oil pressure stays in one mode and cannot be properly regulated. This is frequently triggered by low or dirty oil, or by a stuck or sludged-up oil control valve. Symptoms can include engine noise, rough idle, reduced performance, and warning lights — and it should be addressed promptly to protect the engine. On GMC it is documented across 1 model: Yukon.
What are the most common causes of P06DD?
The most common causes of P06DD are: Low engine oil level or dirty/sludged oil, Faulty or stuck oil pressure control solenoid (oil control valve), Clogged oil passages or solenoid screen from sludge, Wiring or connector problems at the solenoid, Faulty oil pressure sensor, Failing variable-displacement oil pump, Incorrect oil viscosity. The specific cause varies by vehicle.
How much does it cost to fix P06DD on a GMC?
Published repair estimates on GMC range from $3,500 to $8,000 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.