P0344 on 2017 Chrysler Pacifica: Intermittent Cam Sensor Causes and Fixes

What's Unique About the 2017-2017 Chrysler PACIFICA

The 2017 Chrysler Pacifica uses the common 3.6L Pentastar V6, which has four camshaft position sensors in total (intake and exhaust for each bank). The P0344 code specifically points to the intake sensor on the rear bank (Bank 1), which is notoriously difficult to access. Unlike sensors on the front bank, replacing the Bank 1 sensor requires removing the upper intake manifold, turning a simple part swap into a more labor-intensive job. Chrysler has also issued software updates via TSBs that change the fault from a one-trip to a two-trip fault, indicating that some triggers may be software-related or overly sensitive rather than a hard part failure. This was done to reduce nuisance check engine lights for transient sensor glitches.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle.

Symptoms You May Notice

• Engine stalling, sometimes unexpectedly
• Difficulty starting the engine, or a no-start condition
• Rough or erratic idle
• Engine hesitation under load
• Illuminated Check Engine Light
• Traction control light may illuminate
🎬 Watch: How one owner fixed the P0344 and traction light.
• Engine may die and not restart until it has cooled down
• Auto Start/Stop system may be disabled

Most Likely Causes

1. Failing Camshaft Position Sensor (Bank 1) 🔴 High Probability The sensor is a common wear item. Heat and vibration, especially on the rear bank near the firewall, can cause the internal electronics to fail intermittently before failing completely. Oil leaks from the nearby oil filter housing or valve cover can also contaminate the sensor and its connector.
   How to confirm: Use a scan tool to monitor the signal from the Bank 1 Camshaft Position Sensor. An intermittent loss of signal or erratic readings (flat-lining) while the engine is running confirms the issue. Swapping the suspect sensor with a known good one from another position is not feasible for Bank 1 without first removing the intake manifold.
   Typical fix: Replace the faulty camshaft position sensor (Mopar Part #5149141AF). 🎬 Watch: A quick walkthrough of the Bank 1 sensor replacement. Since accessing the Bank 1 sensor requires removing the intake manifold, it is highly recommended to replace the upper and lower intake manifold gaskets (e.g., Fel-Pro MS 97204) at the same time to prevent future vacuum leaks.
   Est. part cost: $32-$120
2. Wiring Harness or Connector Issue 🟡 Medium Probability The engine wiring harness, particularly the section running to the rear bank, is susceptible to heat damage, causing wires to become brittle or insulation to crack. The connector's locking tab can also break, leading to a poor connection. Chafing against other components near the firewall is also a possibility.
   How to confirm: Visually inspect the wiring harness leading to the Bank 1 camshaft sensor for any signs of damage, chafing, or melting. Unplug the connector and check for corrosion, oil contamination, or loose pins. Use a multimeter to check for continuity and proper voltage (typically a 5V reference, ground, and signal wire) at the connector with the key on.
   Typical fix: Repair the damaged section of the wiring harness. Clean the connector with electrical contact cleaner and apply dielectric grease to prevent future corrosion. If the connector itself is damaged, it will need to be replaced.
   Est. part cost: $10-$50
3. Outdated Powertrain Control Module (PCM) Software ⚪ Low Probability Chrysler released TSBs #18-069-17 and #18-002-19 REV A to address overly sensitive fault detection for cam and crank sensor codes. The original software may trigger a P0344 code when no actual hardware fault exists, especially during brief, non-critical signal dropouts. The update changes the logic to require two consecutive drive cycles with a fault before illuminating the MIL.
   How to confirm: A Chrysler dealership or a well-equipped independent shop can check the current software version of the PCM against the vehicle's VIN and determine if an update is available per the TSBs. This should be done before extensive hardware replacement if the issue is very intermittent.
   Typical fix: Reprogram the PCM with the latest available software. This is not a DIY repair and must be done by a professional with the correct tools (like wiTECH).
   Est. part cost: $0-$250

Rare But Worth Checking

• Low or Dirty Engine Oil: The 3.6L Pentastar engine uses oil pressure for its variable valve timing (VVT) system. If the oil is extremely low, dirty, or the wrong viscosity, it can cause the cam phasers to operate incorrectly, which may trigger camshaft position-related codes.
• Damaged Camshaft Reluctor Wheel: The sensor reads a toothed wheel (reluctor) on the camshaft. Though rare, if this wheel is damaged or has a weak magnetic signature (e.g., from exposure to a strong magnet like a tool tray), it can cause an erratic signal. This is a major repair requiring camshaft replacement, as one owner on YouTube discovered was the ultimate fix after replacing sensors did not work.
• Failing Powertrain Control Module (PCM): It is very rare for the PCM itself to be the cause of the problem. This should only be considered after all other possibilities, including sensors, wiring, and software, have been exhaustively ruled out.

Diagnosis Steps

1. Read all codes with an OBD-II scanner and note freeze frame data. Confirm P0344 is present and note any other codes, especially for other cam/crank sensors.
2. Check engine oil level and condition. Top off or change if necessary, as low/dirty oil can affect VVT performance and trigger cam codes.
3. Check battery voltage and charging system. A weak battery can cause numerous intermittent electrical faults.
4. Check for available TSBs. Contact a dealer with your VIN to see if software updates like TSB #18-002-19 REV A or #18-069-17 apply to your vehicle. This may be the fix itself.
5. Using a scan tool with live data, monitor the Camshaft Position Sensor signal for Bank 1, Sensor 1. Watch for dropouts or erratic readings while the engine is running. A good sensor should produce a consistent square wave pattern on an oscilloscope.
6. Visually inspect the wiring and connector for the Bank 1 camshaft sensor. This is difficult as it's on the rear of the engine. Look for any signs of melting, chafing, oil contamination, or corrosion.
7. If wiring looks good and software is up to date, the most probable cause is the sensor itself. Proceed with replacement.
8. To replace the Bank 1 sensor, the upper intake manifold must be removed. 🎬 See how to properly remove the 3.6 Pentastar intake manifold. This involves disconnecting the air intake, throttle body, various vacuum lines, and electrical connectors.
9. While the manifold is off, replace the sensor (Mopar 5149141AF) and it is highly recommended to also replace the upper and lower intake manifold gaskets (e.g., Fel-Pro MS 97204) to prevent future vacuum leaks.
10. Reassemble all components, clear the codes with the scanner, and perform a test drive. Some vehicles may require a camshaft position sensor relearn procedure if the engine runs poorly after replacement.
11. If the code persists, a more advanced diagnosis is needed to check the reluctor wheel on the camshaft itself or a potential fault in the PCM.

Parts You'll Likely Need

• Camshaft Position Sensor (OEM #5149141AF) — This is the most common component to fail and cause an intermittent signal for code P0344. Using an OEM Mopar part is highly recommended for timing components.
  Trusted brands: Mopar, NGK/NTK, Delphi, Standard Motor Products (SMP)
• Upper and Lower Intake Manifold Gaskets — These must be replaced when the intake manifold is removed to access the Bank 1 sensor. Reusing old gaskets will cause vacuum leaks.
  Trusted brands: Fel-Pro (MS 97204), Mopar, Mahle

Related Codes That Often Appear With This One

• P0340 — P0340 is a hard fault for the same sensor circuit (Camshaft Position Sensor Circuit - Bank 1 Sensor 1). P0344 is an intermittent fault, which can turn into a P0340 as the sensor fails completely.
• P0339 — This is an intermittent fault for the Crankshaft Position Sensor. Both TSB #18-002-19 REV A and #18-069-17 list these codes together, as the PCM software update addresses sensitivity for both sensors simultaneously.
• P0345 / P0349 — These are the equivalent codes for the camshaft sensor on Bank 2. Seeing codes for multiple cam sensors simultaneously strongly suggests a widespread issue like a wiring harness problem, low battery voltage, or a PCM software update being needed.
• P0016 — This code (Crankshaft/Camshaft Position Correlation - Bank 1 Sensor A) can appear with P0344. While P0344 is an electrical circuit issue, P0016 points to a mechanical timing problem. Seeing both could indicate a stretched timing chain or failing VVT components, which might also cause the sensor signal to appear erratic.

Technical Service Bulletins (TSBs) & Recalls

• 18-002-19 REV A: Recommends a PCM software update and changes P0344 from a one-trip to a two-trip fault to reduce false positives.
• 1806917: Also involves a PCM software flash to enhance diagnostics and system performance, addressing P0344 among other codes.

Platform-Specific Known Issues

• The location of the Bank 1 camshaft position sensor is a major issue on this platform. It is on the rear cylinder head against the firewall, requiring the removal of the upper intake manifold for access, which significantly increases labor time and cost.
• Chrysler has issued multiple Technical Service Bulletins (TSBs), including #18-002-19 REV A and #18-069-17, which update PCM software to change the P0344 from a one-trip to a two-trip fault to reduce false positives.
• Oil leaks from the oil filter housing/cooler assembly (located in the engine 'V' under the intake manifold) are extremely common on the 3.6L Pentastar. When replacing the Bank 1 cam sensor, it is a critical opportunity to inspect this housing for leaks, as oil can seep down and damage wiring and sensors.

Mechanic-Grade Diagnostic Values

• Sensor Circuit 5V Reference — expected: Approximately 5.0V with key on, engine off.. Failure: Significantly lower or no voltage indicates a problem with the PCM or the 5V supply wire.
• Sensor Circuit Ground Resistance — expected: Less than 5.0 Ohms between the sensor's ground pin and a known good chassis ground.. Failure: High resistance (OL or many ohms) indicates a broken or corroded ground wire.
• Wiring Harness Continuity — expected: Less than 1.0 ohm of resistance on the signal, power, and ground wires between the sensor connector and the PCM connector.. Failure: High resistance indicates a break or corrosion in the wire being tested.
• Camshaft Position Sensor Signal (Oscilloscope) — expected: A clean square wave switching between approximately 0V and 5V as the engine runs.. Failure: The signal will show dropouts, glitches, a flat line, or irregular patterns instead of a consistent square wave.

Scan Tool Commands That Help

• wiTECH (Chrysler Dealer Tool) or equivalent professional scanner: Cam/Crank Relearn (CKP Variation Relearn) — This function should be performed after replacing a camshaft position sensor, crankshaft position sensor, timing components, or the PCM. It allows the PCM to learn the new component's signal variations to ensure accurate timing and misfire detection. Failure to perform this can sometimes cause timing-related codes to return.

Wiring & Ground Locations

• Bank 1 Cam Sensor Connector Pinout — The electrical connector on the Bank 1 (rear) camshaft position sensor.. Knowing the pinout is critical for accurate electrical testing. For a typical 3-wire sensor on a 3.6L, Pin 1 is the 5V supply, Pin 2 is the signal wire, and Pin 3 is the ground. This allows a technician to test for power, ground, and signal directly at the sensor.
• Engine Ground Straps — Multiple locations, including from the engine block to the chassis and from the negative battery terminal to the chassis near the fuse box.. A poor engine ground can cause a variety of intermittent electrical issues, including erratic sensor signals. Ensuring all ground straps are clean, tight, and free of corrosion is a crucial step in diagnosing intermittent electrical faults like P0344.

Real Owner Repair Stories

• YouTube channel 'The Howards Garage' (2011 Dodge Charger with 3.6L Pentastar engine) — Persistent P0344 code, illuminated traction control light, reduced engine power, and difficulty maintaining highway speed.
  ❌ Tried (didn't work) Replacing the camshaft position sensor, Replacing the crankshaft position sensor
  ✅ What actually fixed it The entire Bank 1 exhaust camshaft was replaced. The root cause was a weak magnetic signature on the camshaft's reluctor wheel (tone ring). The wheel was not visibly damaged or loose, but its magnetic field was too weak for the sensor to read reliably, causing an intermittent signal.

"I Checked Everything" — The Actual Cause

• In some cases, all electrical tests for the sensor and wiring may pass, yet the P0344 code persists. One documented cause for this is a magnetically weak reluctor wheel on the camshaft itself. The sensor, wiring, and PCM are all functioning correctly, but the signal source (the magnetic wheel) is faulty. This is not a failure that can be found with a smoke test or standard multimeter tests; it is typically diagnosed after all other possibilities have been exhausted and may only be confirmed by observing a poor signal on an oscilloscope or by replacing the camshaft.

When the Usual Fixes Don't Work

• While replacing the camshaft position sensor is the most common fix for P0344, there are documented cases where this does not resolve the issue. In one instance involving a 3.6L Pentastar engine, multiple sensors were replaced with no success. The ultimate cause was a degradation of the magnetic reluctor wheel on the camshaft. This required replacing the entire camshaft assembly to fix the intermittent signal, a far more complex and expensive repair than a simple sensor swap. This highlights that if a new, quality sensor and verified wiring do not fix the code, the problem may lie with the mechanical component the sensor is reading.

OEM Part Supersession History

• 5149141AF → N/A — As of early 2026, 5149141AF is the current and specified OEM part number for the camshaft position sensor.
  Heads up: Some Mopar parts distributors list '05149141AF' as an alternate number, but this is a formatting variation and not a supersession. No superseding part number was identified.