P0345 on 2009-2014 Hyundai Genesis 3.8L: Camshaft Sensor Circuit Causes and Fixes

What's Unique About the 2009-2014 Hyundai Genesis

The Hyundai Lambda V6 engine family is generally robust but is known to be sensitive to oil quality and maintenance. While P0345 is an electrical circuit code, issues like oil sludge can sometimes contribute to erratic sensor behavior or mask underlying mechanical timing problems by affecting the CVVT system that the sensor monitors. However, for an isolated P0345 code, the issue is almost always electrical and confined to the sensor or its wiring, making it a straightforward diagnosis compared to 🎬 Watch: A complete repair guide for the P0345 circuit code. more complex mechanical timing codes like P0018.

Symptoms You May Notice

• Check Engine Light is on
• Engine is hard to start or cranks but won't start
• Engine stalls unexpectedly, either at idle or while driving
• Rough idle and engine misfires
• Noticeable loss of engine power and sluggish acceleration
• Decreased fuel economy
• Exhaust pipe releases smell of gas

Most Likely Causes

1. Failed Bank 2 Intake Camshaft Position Sensor 🔴 High Probability → Shop Engine Camshaft Position Sensor Sensors are exposed to extreme heat cycles and oil vapor, causing them to fail over time. It's a common wear-and-tear item on most modern engines.
   How to confirm: Swap the Bank 2 (driver's side) intake sensor with the Bank 1 (passenger's side) intake sensor. Clear the codes and drive. If the code changes to P0340 (Bank 1), the sensor you moved is faulty. You can also test the sensor's resistance with a multimeter; an out-of-spec reading indicates failure.
   Typical fix: Replace the faulty camshaft position sensor. It is held in by a single 10mm bolt 🎬 See this walkthrough on how to replace the sensors. and is located on the front of the valve cover.
   Est. part cost: $30-$80
2. Wiring Harness or Connector Issue 🟡 Medium Probability Engine vibration and heat can cause wires to fray, or connectors can become loose or contaminated with oil. Rodents are also known to chew on engine bay wiring.
   How to confirm: Visually inspect the wiring leading to the Bank 2 intake cam sensor for any breaks, melting, or chafing. Check that the connector is securely plugged in and that the pins are clean. Use a multimeter to back-probe the connector (with the key on) to verify a 5V reference voltage, a good ground, and a fluctuating signal when the engine is cranked.
   Typical fix: Repair the damaged section of wiring or clean the connector terminals with electrical contact cleaner. If the connector is broken, it will need to be replaced.
   Est. part cost: $5-$50
3. Low or Dirty Engine Oil ⚪ Low Probability The CVVT (Continuous Variable Valve Timing) system, which the cam sensors monitor, is operated by oil pressure. While low/dirty oil typically causes correlation codes (like P0018), severe sludge can clog passages, affect CVVT operation, and potentially contribute to erratic sensor readings.
   How to confirm: Check the engine oil level and condition on the dipstick. If the oil is very low, dark, or sludgy, this could be a contributing factor.
   Typical fix: Perform an oil and filter change using a high-quality full synthetic 5W-20 or 5W-30 oil and a quality filter.
   Est. part cost: $40-$100

Rare But Worth Checking

• Failing Crankshaft Position Sensor: A bad crankshaft sensor can send erratic signals that cause the ECM to misinterpret the camshaft sensor's signal, leading to a P0345 code. This is uncommon but possible if replacing the cam sensor doesn't fix the issue.
• Damaged Reluctor Ring on Camshaft: → Shop Engine Camshaft The sensor reads teeth on a reluctor ring (or tone ring) on the camshaft. If this ring is damaged, cracked, or has missing teeth, the signal will be incorrect, which can trigger a P0345 code. This is a mechanical issue and requires more in-depth repair.
• Stretched Timing Chain: → Shop Engine Timing Chain This will almost always set correlation codes like P0018 or P0019 first. However, in very rare cases, severe timing slack could potentially cause an erratic signal that the ECM interprets as a circuit fault. A rattling noise on startup is a key symptom.
• Faulty Engine Control Module (ECM): This is extremely rare. The ECM should only be considered a potential cause after all other possibilities (sensor, wiring, timing) have been exhaustively ruled out by a professional.

Diagnosis Steps

1. Scan the vehicle for all DTCs. Confirm P0345 is present and note any other codes, especially timing correlation codes like P0018.
2. Visually inspect the Bank 2 (driver's side) intake camshaft position sensor and its electrical connector. Look for loose connections, oil contamination, or damaged wires.
3. If a visual issue is found, repair it, clear the codes, and re-test.
4. If no visual issues are present, perform a sensor swap. Disconnect and remove the Bank 2 intake cam sensor and the Bank 1 (passenger's side) intake cam sensor. Swap their positions.
5. Clear all DTCs and start the engine. Let it run for a few minutes and then re-scan for codes.
6. If code P0340 appears, the original Bank 2 sensor is faulty 🎬 Watch: How to diagnose and fix a Bank 2 malfunction. and must be replaced.
7. If code P0345 reappears, the sensor is likely good. The problem is in the wiring harness or the ECM. Test the harness connector for a 5V reference, good ground, and a signal using a multimeter. Check the wiring for continuity from the connector back to the ECM.
8. After replacing the sensor, some vehicles may require a 'relearn' procedure, which often completes automatically after a short drive cycle.
9. If wiring tests good, the fault may lie with the ECM, which requires professional diagnosis.

Parts You'll Likely Need

• Camshaft Position Sensor (Bank 2, Intake) (OEM #39350-3F000) — This is the most common failure part for a P0345 code. The sensor wears out over time. It is highly recommended to use a genuine Hyundai/Kia OEM part, as some aftermarket sensors have been reported to be unreliable or fail prematurely.
  Trusted brands: Hyundai/Kia Genuine, Hitachi, Delphi, NTK
  OEM price range: $60-$100
  Aftermarket price range: $30-$70

Related Codes That Often Appear With This One

• P0340 — This is the equivalent code for Bank 1 (passenger's side). If you swap the Bank 1 and Bank 2 intake sensors for diagnosis, P0345 will turn into P0340, confirming a bad sensor.
• P0300 — A random/multiple cylinder misfire code can be triggered because the incorrect cam sensor data leads to improper ignition and fuel timing, causing the engine to run rough.
• P0018 — This is a timing correlation code for Bank 2. While P0345 is electrical, a related mechanical timing issue (like a failing OCV or stretched chain) could cause both codes to appear, suggesting a more complex problem than just a bad sensor.

Technical Service Bulletins (TSBs) & Recalls

• TSB 12-EM-004: While not for P0345 directly, this TSB addresses CVVT system performance issues related to oil sludge, which is relevant context for the overall health of the valve timing system monitored by the cam sensors.
• TSB 09-EM-002: Provides resistance specifications (6.7-7.9 ohms) for testing the Oil Control Valves (OCVs), which are a key part of the CVVT system. A failing OCV can cause timing codes that may appear alongside sensor circuit codes.

Platform-Specific Known Issues

• CVVT System Sensitivity: The Lambda V6's CVVT system is operated by oil pressure and can be sensitive to oil level and cleanliness. Hyundai TSB 12-EM-004 discusses issues related to CVVT performance and oil sludge. While this more commonly causes timing correlation codes, severe contamination could potentially affect the components the cam sensor is monitoring.

Mechanic-Grade Diagnostic Values

• Camshaft Position Sensor (Hall Effect Type) Signal Voltage — expected: A repeating digital square wave, switching between approximately 0V and 5V as the camshaft rotates.. Failure: A signal that is stuck high (at 5V), stuck low (at 0V), or shows a distorted or missing pattern indicates a sensor or circuit fault.
• Sensor Connector Power Supply Pin — expected: Approximately 5V with the key on, engine off.. Failure: A reading of 0V or significantly less than 5V points to an open or short in the power supply wire from the ECM.
• Sensor Connector Ground Pin — expected: Near 0V DC and very low resistance (less than 1 ohm) to chassis ground.. Failure: Any significant voltage on the ground pin or high resistance to ground indicates a bad ground connection.
• Oil Control Valve (OCV) Solenoid Resistance — expected: 6.7 - 7.9 ohms at 68°F (20°C).. Failure: A reading outside this range, or infinite (open) / zero (shorted) resistance, indicates a faulty OCV. While this typically sets a P0018 code, a malfunctioning CVVT system can sometimes contribute to erratic sensor readings.

Hidden / Shadow Codes Worth Checking

• P0346, P0347, P0348, P0349: These are related codes for the same sensor circuit. P0346 indicates a performance/range issue, P0347 indicates a low input, P0348 indicates a high input, and P0349 indicates an intermittent signal. Seeing one of these alongside P0345 can help pinpoint the nature of the electrical fault (e.g., a short to ground vs. an open circuit). (see via Standard OBD-II scanner.)

Wiring & Ground Locations

• Bank 2 Intake CMP Sensor Connector — On the front of the driver's side valve cover, near the top. It is a 3-pin connector.. This is the primary point for testing voltage, ground, and signal. The pins are typically: Pin 1 - Signal, Pin 2 - Ground, Pin 3 - 5V Power. Verify with a vehicle-specific diagram.
• ECM/PCM — Typically located in the engine bay, often near the battery or firewall, or sometimes inside the passenger cabin near the glove box.. This is the termination point for the sensor circuit. A continuity test from the sensor connector to the corresponding pins on the ECM connector is the final step to confirm wiring integrity if no fault is found at the sensor end.

Real Owner Repair Stories

• YouTube video by 'Replace Stuff' (2011 Hyundai Genesis 4.6L V8 Sedan (Note: 4.6L V8, but sensor location and replacement procedure are analogous to the 3.8L V6)) — Check Engine Light with a camshaft sensor code (P0366, which is Bank 1 Exhaust, but diagnosis is the same principle).
  ❌ Tried (didn't work) The user went straight to diagnosis and replacement.
  ✅ What actually fixed it The user replaced the faulty camshaft position sensor. The video clearly shows the location on the valve cover, the single 10mm bolt holding it in, and the process of removing the old sensor and installing the new one.

OEM Part Supersession History

• 39350-3F000 → N/A - This part number appears to be stable and fits a wide range of Hyundai/Kia vehicles from 2008-2020. — N/A
  Heads up: While the part number is used across many engines, including Elantra and Equus models, always verify fitment with the vehicle's VIN. There are other similar-looking sensors for different applications (e.g., 39350-25010, 39318-3C100) that will not work correctly.

Model Year Variations Within This Range

• 2009-2011: These years used the Lambda II MPI (Multi-Point Injection) version of the 3.8L V6. These engines are generally considered very reliable.
• 2012-2014: These years used the Lambda II GDI (Gasoline Direct Injection) version. While the P0345 diagnostic procedure is identical, GDI engines are inherently more susceptible to carbon buildup on intake valves. This doesn't directly cause P0345, but highlights a difference in long-term engine maintenance needs.

Diagnostic Flowchart

Other Known Issues on This Vehicle

Issues unrelated to this code that are worth knowing about as an owner of this generation:

• Carbon Buildup on Intake Valves (GDI models) 🟠 Medium — Common on 2012+ GDI engines, typically becoming problematic after 80,000-100,000 miles. Causes misfires, rough idle, and power loss.
• Brake System HECU Corrosion 🔴 High — Subject of NHTSA Recall 13V-113, affecting 2009-2012 models. Incorrect brake fluid could cause corrosion in the Hydraulic Electronic Control Unit (HECU), reducing braking performance. (Ref: NHTSA Campaign ID: 13V113000)
• Faulty Stop Lamp Switch 🟠 Medium — A widespread issue leading to NHTSA Recall 13V-113. The switch could fail, causing brake lights to not illuminate or cruise control to not deactivate. Affects 2009-2011 models. (Ref: NHTSA Campaign ID: 13V113000 (Expanded))
• Oil Leaks from Gaskets 🟡 Low — Becomes more common on higher mileage engines (100,000+ miles). Valve cover gaskets and oil pan gaskets are the most frequent sources of leaks.
• Early 8-Speed Transmission Problems 🟠 Medium — Some issues were reported with the new 8-speed automatic transmission introduced in 2012 models, though many were addressed under Hyundai's extensive warranty.

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: Never. A camshaft position sensor is a relatively inexpensive electronic component that is a common wear-and-tear item. The labor to access it is minimal, but the risk of a used sensor failing shortly after installation makes it a poor value proposition. The potential for being stranded outweighs the small cost savings.

What to inspect on the donor part:

• Not applicable as a used part is not recommended.

OEM-only on this vehicle (don't cheap out):

• Camshaft Position Sensor

Aftermarket brands forum-validated for this vehicle:

• NTK
• Delphi
• Hitachi

Brands owners have reported issues with on this vehicle:

• Unbranded, 'white-box' parts from online marketplaces. Forum discussions frequently mention that cheap, no-name sensors are a common cause of repeat failures or codes that won't clear after replacement.

Real Owner Stories

Aggregated from forums and TSBs cited above. Mileages and costs reflect what owners reported in those sources.

Related OBD-II Codes

• P0340 — The Bank 1 (passenger side) equivalent of P0345; often appears if a faulty sensor is swapped from Bank 2 to Bank 1 during diagnosis.
• P0018 — A timing correlation code that often appears alongside cam sensor codes when oil sludge or CVVT issues affect engine timing.
• P0300 — Random or multiple cylinder misfires which are a common symptom of the erratic timing caused by a P0345 fault.

Frequently Asked Questions