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2008 Saturn Vue 3.6L Engine Running Rough with P0014, P0496, P0174 - Cold Start Good, Hot Start Poor

Model: 2008 saturn vue 3.6L Fault Code: P0014 Posted: 2016-04-17 15:10

While driving home from work, my 2008 Saturn Vue 3.6L began running rough and out of time. My OBD2 scanner displayed multiple diagnostic trouble codes: P0014, P0496, and P0174. I initially suspected the Bank 1 intake and exhaust cam position actuators (commonly referred to as solenoids) were faulty and replaced them. After replacement, the car ran smoothly when cold but began running rough again once warmed up—exactly as it did before the repair. The codes have since evolved to include P0011, P0014, P0024, and P0174, indicating a worsening condition. The vehicle runs fine at idle and during cold starts but deteriorates significantly after 15 minutes of driving when it reaches operating temperature. This behavior suggests an issue with variable valve timing (VCT) or oil-related system performance. I’ve checked the engine oil level, quality, and changed the oil and filter recently—yet the problem persists. I’m seeking reliable information on how to diagnose and resolve this issue, especially regarding potential internal contamination of camshaft actuators or solenoids due to high mileage (208,000 miles). Are there known causes for such symptoms in 3.6L Saturn Vue engines? What steps can be taken to clean oil passages or restore proper valve timing operation? Any guidance on oil pressure specifications or recommended additives would be greatly appreciated.

Related fault codes

P0014P0174P0496

Comments (4)

Anonymous 2016-04-17 15:43

You replaced the cam solenoids—or the actual camshaft position actuators? I believe you're referring to the solenoids. Bank 1 is the right side (R/S) cylinder bank. This system relies heavily on oil pressure. Please verify your oil level, quality, cleanliness, and especially oil pressure. Oil sludge or gunk can severely restrict solenoid movement. Also check for grounded wires connected to the solenoids. I often recommend using a product like RISOLONE—an oil detergent designed to clean internal engine passages. I’ve seen positive results with it in similar cases. I agree—addressing the VCT (variable valve timing) issue should be prioritized first.

Anonymous 2016-04-17 17:55

Thanks for the prompt response—I've bookmarked this site for future reference. I replaced the cam solenoids. When I removed the cam position sensors, they were severely clogged and covered in gummy residue. I bought the car as a work vehicle with 79,000 miles originally. It appeared well-maintained at the time of purchase—both visually and according to Carchex reports. Since then, I’ve driven it on highways and logged over 208,000 miles. Given that the sensors were so dirty, what are the chances the camshaft actuators (solenoids) are also affected? Can they be cleaned or is replacement necessary? You mentioned RISOLONE—do you have verified results from its use in this scenario? Thank you sincerely for your help!

Anonymous 2016-04-17 17:59

Kev2 — Just before replacing the solenoids, I changed both the engine oil and filter. What should a healthy oil pressure reading be for a 2008 Saturn Vue 3.6L? And finally—why does the engine run fine when cold but fail to maintain performance once it reaches full operating temperature (typically after about 15 minutes)? Thanks again!

Anonymous 2016-04-18 07:52

Let me address your questions: >> "What are the chances that the actuators are gummed up?" At 208,000 miles, I can't be certain—but the RISOLONE additive is under $10 and may help clear sludge buildup in oil passages. Try it as a first step. >> "What should the oil pressure read?" Don’t rely on the dashboard gauge—it’s often inaccurate. A mechanical oil pressure gauge is required for accurate readings. We’ll revisit this after the additive has had time to work (a few miles). >> "Why does the engine run well when cold but fail at full operating temperature?" This is common—most engine control units (ECUs) only engage closed-loop control and begin adjusting valve timing once the engine reaches a stable operating temperature. This delay explains why symptoms appear after warm-up. >> "Do you have good results with RISOLONE?" Yes—I’ve used RISOLONE for years to address sludge and gummy deposits in engines, and I’ve seen consistent improvements without any negative side effects. There’s a critical difference between reading codes and using a professional scanner: the latter allows live data access and real-time control of ECU-managed functions. For example, we can monitor cam-to-crank timing offsets and assess chain/tensioner health. We’re not done here—yet. I remain cautiously optimistic. Try RISOLONE first; after a few miles of operation, I’ll check official oil pressure specifications and continue troubleshooting.