Most Common Saturn Check Engine Codes (Vue, Ion, Outlook, Aura, and S-Series)

Understanding Saturn Check Engine Codes

Saturn was General Motors' compact car brand from 1985 to 2010. While early Saturn models (S-Series, L-Series) used unique Saturn-designed engines, later models including the Vue, Ion, Aura, and Outlook used standard GM powertrains shared with Chevrolet, Pontiac, and other GM brands. The Vue used GM's 2.2L and 2.4L Ecotec four-cylinders as well as the 3.5L V6. The Ion used the 2.2L Ecotec. The Outlook used the 3.6L V6, the same engine found in the Chevrolet Traverse and GMC Acadia. The Aura used the 2.4L Ecotec or the 3.5L and 3.6L V6. The S-Series (SL, SC, SW) used Saturn's own 1.9L SOHC and DOHC four-cylinders. Because most later Saturns use standard GM components, check engine codes and their fixes are identical to those on Chevrolet and Pontiac models. Parts availability is still excellent through GM's aftermarket channels despite the brand being discontinued.

P0011 -- Intake Camshaft Position Timing Over-Advanced (Bank 1)

P0011 on Saturn vehicles with the 2.2L or 2.4L Ecotec engine indicates the intake camshaft is more advanced than the ECU commanded. The Ecotec engine uses variable valve timing controlled by oil-pressure-actuated cam phasers. On the Vue and Ion with the 2.2L Ecotec, P0011 is commonly caused by a clogged intake cam phaser solenoid screen. The solenoid costs $25-$45 and the screen can sometimes be cleaned rather than replaced. On the Aura with the 2.4L Ecotec, the cam phaser actuator itself can wear out, creating excessive play in the phaser mechanism. Low oil level or overdue oil changes are the root cause of most cam timing codes on Ecotec engines -- the VVT system is highly sensitive to oil quality. On the Outlook with the 3.6L V6, P0011 is often an early symptom of timing chain stretch, especially on 2007-2010 models.

P0016 -- Crankshaft/Camshaft Position Correlation (Bank 1 Sensor A)

P0016 indicates the ECU has detected a timing deviation between the crankshaft and intake camshaft positions. On the Vue, Ion, and Aura with the 2.2L or 2.4L Ecotec, this code is frequently the result of a stretched timing chain. The Ecotec engine uses a single timing chain that drives both camshafts, and the chain tensioner and guides can wear, allowing the chain to stretch. Symptoms include a rattling noise on startup and rough idle. The timing chain replacement on the Ecotec costs $800-$1,400 at a shop. If P0016 appears alongside P0011, the timing chain is almost certainly the issue rather than a simple solenoid failure. On the Outlook with the 3.6L V6, P0016 combined with P0008 or P0017 confirms the well-known timing chain stretch issue on early 3.6L engines. This is a more expensive repair ($1,500-$2,500) due to the three-chain design on the V6.

P0171 -- System Too Lean (Bank 1)

P0171 on Saturn vehicles indicates a lean fuel condition on Bank 1. On the Vue and Ion with the 2.2L Ecotec, the most common cause is a vacuum leak at the intake manifold gasket or a cracked PCV hose. The intake manifold gasket costs $15-$25 and the repair takes 1-2 hours. On the S-Series with the 1.9L Saturn engine, P0171 is frequently caused by a leaking EGR gasket or a vacuum leak at the throttle body gasket. The S-Series engine has a simpler design with fewer potential leak points than the Ecotec. On the Aura and Outlook, a dirty mass airflow sensor ($40-$70) is a common cause -- clean it with MAF cleaner spray ($8-$12) before replacing. On the Vue with the 3.5L V6, check for a vacuum leak at the upper intake manifold gasket.

P0300 -- Random/Multiple Cylinder Misfire Detected

P0300 on the Vue and Ion with the 2.2L Ecotec is commonly caused by worn spark plugs or failing ignition coils. The Ecotec uses a coil-on-plug ignition system with four individual coils. Spark plugs should be replaced every 100,000 miles, but misfires can appear earlier at 80,000 miles. Coils cost $20-$35 each aftermarket. On the S-Series with the 1.9L engine, the ignition module (located on the front of the engine) is a known weak point that can cause random misfires across all cylinders. The ignition module costs $60-$100. On the Outlook with the 3.6L V6, P0300 combined with timing-related codes (P0008, P0016) points to the timing chain stretch issue affecting valve timing. On the Aura with the 2.4L Ecotec, carbon buildup on the direct-injection intake valves can cause misfires after 60,000-80,000 miles.

P0420 -- Catalyst System Efficiency Below Threshold (Bank 1)

P0420 on Saturn vehicles generally appears between 100,000 and 150,000 miles. On the Vue and Ion with the 2.2L Ecotec, aftermarket catalytic converters are relatively affordable at $150-$350. On the S-Series, the catalytic converter is close-coupled to the exhaust manifold, which means it runs hotter and may fail sooner. S-Series converters cost $150-$300 aftermarket. On the Outlook with the 3.6L V6, converters are more expensive ($300-$600 aftermarket per bank). Before replacing any catalytic converter, check the downstream oxygen sensor ($40-$60) -- a sluggish sensor is a cheaper fix that can resolve P0420. On any Saturn with oil consumption or misfire issues, fix those problems first, as they will contaminate and destroy a new converter.

P0442 -- EVAP System Small Leak Detected

P0442 indicates a small leak in the evaporative emissions system. On the Vue and Ion, the gas cap is the first suspect -- replace it ($12-$18) and clear the code. On the S-Series, the EVAP canister purge valve is located on the engine and can develop hairline cracks in its plastic housing, creating a small leak. The purge valve costs $25-$40. On the Aura and Outlook, the EVAP system hose connections near the fuel tank can loosen from vibration over time. A smoke test ($80-$150) is the most efficient way to locate a small EVAP leak. P0442 does not affect drivability and is not an urgent repair, but it will cause an emissions test failure in states that require testing.

P0446 -- EVAP Vent System Control Circuit

P0446 on Saturn vehicles indicates a problem with the EVAP vent valve circuit. The vent valve is located near the charcoal canister at the rear of the vehicle. On the Vue, the vent valve costs $30-$50 and is accessible from underneath the rear of the vehicle. On the Ion, the vent valve and charcoal canister are mounted together and can be replaced as an assembly if both are damaged. On the S-Series, the vent valve location makes it susceptible to road debris damage and corrosion from road salt in northern climates. Before replacing the valve, check the electrical connector for corrosion -- cleaning the connector with electrical contact cleaner can resolve the code. Insect nests inside the vent valve are a surprisingly common cause on all Saturn models due to the valve's ground-level location.

P0449 -- EVAP Vent Solenoid Control Circuit

P0449 is one of the most common codes on GM vehicles including Saturn and indicates an electrical fault in the EVAP vent solenoid circuit. The solenoid is located near the charcoal canister at the rear of the vehicle and costs $20-$40. On the Vue, Ion, and Aura, this is a straightforward DIY replacement accessible from underneath the vehicle. The most common failure mode is corrosion on the electrical connector rather than the solenoid itself. Symptoms are minimal -- you may notice difficulty filling the gas tank or a faint fuel smell. This code does not affect drivability or performance. On the Outlook, the solenoid is in the same location as on the Chevrolet Traverse and GMC Acadia.

P0496 -- EVAP System High Purge Flow

P0496 means the EVAP purge solenoid is stuck open, allowing fuel vapors to continuously flow into the intake manifold. This is the most common EVAP code on GM vehicles including Saturn. The purge solenoid is located on or near the intake manifold and costs $25-$40 for an aftermarket replacement. On the Vue with the 2.2L Ecotec, the purge valve is on top of the engine and takes 15 minutes to replace. On the Ion, the purge valve is in a similar accessible location. On the S-Series, the purge valve is on the intake plenum. Symptoms include rough cold idle, occasional stalling, difficulty filling the gas tank (the pump nozzle clicks off repeatedly), and a slight fuel vapor smell. This is a quick, inexpensive fix that most owners can handle as a DIY project.

P0700 -- Transmission Control System Malfunction

P0700 is a generic flag indicating the transmission control module has stored its own fault code. On the Vue with the CVT transmission (2002-2005 models), this code is particularly important. The Saturn Vue was one of the first mainstream vehicles to use a CVT in North America, and early units had reliability issues including belt slippage and overheating. If P0700 appears on a CVT-equipped Vue, read the specific transmission code with an enhanced GM scanner. On the Vue with the 4-speed automatic (non-CVT), common issues include solenoid failures and torque converter clutch problems. On the Ion with the 4-speed automatic or the Getrag 5-speed manual, P0700 is less common. On the Outlook with the 6-speed automatic, torque converter shudder is the most frequent issue. For any P0700 code, proper diagnosis requires reading the specific transmission fault code stored in the TCM.

Saturn Model-Specific Issues

The Vue (2002-2010) is Saturn's most common model still on the road. The 2002-2005 Vue with the CVT transmission has known CVT reliability issues -- many have been converted to conventional automatic transmissions. The 2006-2007 Vue switched to a conventional automatic and is more reliable. The 2008-2010 Vue (also sold as the Chevrolet Captiva internationally) used GM's Theta platform and is generally reliable. The Ion (2003-2007) replaced the S-Series and uses the Ecotec engine. It is generally reliable but has a known ignition switch issue (part of the GM ignition switch recall). The S-Series (1991-2002) uses Saturn's unique 1.9L engine that is simple and durable but has unique parts not shared with other GM vehicles. The Aura (2007-2009) is a rebadged Chevrolet Malibu and shares all its components. The Outlook (2007-2010) is a rebadged GMC Acadia and shares the 3.6L V6 timing chain issues with other Lambda-platform GM vehicles.

DIY Tips for Saturn Owners

Saturn vehicles are very DIY-friendly with simple, accessible engine bays. The Ecotec four-cylinder engines have excellent access to all components from the top of the engine. The S-Series is one of the easiest cars ever made to work on, with its polymer body panels (no rust) and straightforward engine design. For OBD-II scanning, any standard scanner reads Saturn powertrain codes. For enhanced diagnostics including transmission codes, a GM-compatible scanner or a Bluetooth adapter with the Torque Pro app provides broader module access. Despite Saturn being discontinued in 2010, parts availability is excellent because most later Saturn vehicles use standard GM components available through ACDelco and aftermarket channels. For the S-Series, Saturn-specific parts are becoming harder to find at auto parts stores but are still available online through RockAuto and eBay. Join saturnfans.com for the most active Saturn community with model-specific DIY guides and parts sourcing advice.

Frequently Asked Questions