OBD-II trouble code
P06DD: Engine Oil Pressure Control Circuit Stuck Off
The oil-pressure control solenoid is stuck off. On GM's chart, off is the high-pressure state and on is the low-pressure state, so a stuck-off valve holds pressure up rather than dropping it. A 2016 GM preliminary information describes that as about 95 psi, with possible damage to the oil-pump face. A mechanical gauge still comes first, because a different GM note groups this code with low pressure.
Quick facts
- System
- Powertrain
- Category
- Electrical / PCM
- Severity
- High severity
- Drivable
- Usually safe to drive short-term
- Repair cost range
- $150 – $900
- DIY difficulty
- Intermediate DIY
Browse every code in P0600–P06DD, or start from the full code library.
What does P06DD mean?
Many modern engines use a variable-displacement or two-stage oil pump whose output is regulated by the PCM through an oil pressure control solenoid (valve). The computer raises pressure when the engine needs it — for higher loads, hotter temperatures, or variable valve timing demands — and lowers it to save energy when it doesn't. P06DD sets when that solenoid does not follow the command. On the GM chart the valve is two-port: commanded off, oil pressure is higher; commanded on, oil pressure is lower. Stuck off is the high-pressure state, not a drop to a low default. A 2016 GM preliminary information describes a valve stuck off commanding about 95 psi, with possible damage to the oil-pump face. A different GM preliminary information, PIP5308B, groups P06DD with P0521 and low oil pressure on listed 2014–2018 trucks, so the code is not a promise that pressure is high either. It's a control-side fault, which is why it lives in the electrical/PCM family alongside the oil pressure sensor codes P0520 through P0524 that monitor the result.
The causes center on the control solenoid and its circuit. A failed or stuck oil pressure control solenoid is the headline cause — and these valves are prone to sticking when oil is dirty or sludged, since varnish and debris jam the spool. Electrical faults are common too: an open or shorted control wire, a corroded or loose connector, or a lost power or ground that keeps the solenoid from energizing. Low or degraded oil, a clogged screen, or neglected oil changes contribute by both sticking the valve and starving the system. Less often, the PCM driver that controls the circuit is at fault. Because the solenoid relies on clean oil to move freely, an oil and filter service is frequently part of both the cause and the cure.
For the driver, P06DD may show up as a check engine light with few obvious symptoms, or as signs tied to oil pressure and variable valve timing: a possible oil pressure warning, rough running or timing-related codes (the VVT system depends on controlled oil pressure), and on some engines noise or performance changes. Do not assume it is harmless, and do not assume the pressure is low. Verify it with a mechanical gauge. Low pressure can destroy the engine. The 2016 note's stuck-off case is the other direction, about 95 psi, with a damaged pump face. Either result is a reason to stop and run the command test rather than to keep driving.
Common causes
- Low or degraded oil, or a clogged oil screen — the cheapest cause and the one this page's own second step looks for
- Sludge or varnish jamming the control valve from dirty oil
- Corroded or loose solenoid connector
- Open or shorted control-circuit wiring
- Lost power or ground to the solenoid
- Failed or stuck oil pressure control solenoid (valve)
- PCM control-circuit driver fault (less common)
Symptoms
- Check engine light with P06DD stored
- Possible oil pressure warning light
- Variable valve timing performance issues or related codes
- Rough running or reduced performance on some engines
- Engine noise tied to oil pressure on certain platforms
- Often few obvious symptoms beyond the stored code
Diagnostic steps
- 1.Verify actual oil pressure with a mechanical gauge before anything else — rule out a genuine low-pressure condition that could damage the engine. Treat this as the hazardous step it is: the sender threads into a gallery of hot oil, so let the engine cool before unthreading it, and the test then calls for running the engine with a gauge hose routed through the bay. Route that hose clear of the exhaust, the belt drive and the cooling fan, which can start unprompted with the key on, and check the fitting is tight before starting — oil from a hose that lets go onto a hot manifold will catch. If that is not work you are set up to do safely, this is the point to hand it to a shop rather than skip it.
- 2.Check oil level and condition; dirty or low oil both sticks the control valve and starves the system.
- 3.Inspect the oil pressure control solenoid connector and wiring for opens, shorts, corrosion, and looseness.
- 4.On the GM Silverado 5.3 chart, hold 1,200 rpm and command the oil-pressure control solenoid on and off. Engine oil pressure should change by more than 4 psi (30 kPa). No change, and that chart replaces the solenoid. A change, and the chart continues into oil-pressure diagnosis instead of another solenoid.
- 5.Measure the solenoid against its own specification. A 2024 GM preliminary information for the 1.2L Trax looks for 10–30 ohms between the control and ignition terminals, then looks for debris in the valve. A reading inside that window does not clear a valve that will not move the pressure.
- 6.Replace the solenoid only after the command test or the resistance test has failed it. Then confirm pressure still changes when the solenoid is commanded, which is the same 4 psi check.
Repair cost
$150 – $900
An oil and filter service, or a connector you can reach, is the light end of the job. Pump or bottom-end work, once a mechanical gauge has shown pressure the chart does not accept, is the heavy end. The numbers shown are a span you can plan around, not a quoted price. Price an oil service or a pump, plus the labor the service information publishes for this engine's oil-control parts. Do not drive on the code while that gauge reading is still unknown. Low pressure destroys bearings. The stuck-off case in the 2016 GM note is the other direction.
Estimate your repair
Run the numbers for your vehicle
Open the Repair Cost Estimator with oil pressure sensor / switch replacement preselected. Adjust labor rate and vehicle category to fit your situation.
DIY vs shop
This is an intermediate DIY job. It usually involves diagnostic steps, specialty parts, and some careful work in tight spaces. If you have the tools and a service manual or trustworthy video for your specific vehicle, it is achievable in a weekend. Otherwise, a competent independent shop will be faster.