P0344 on 2014-2018 Ram 3500: Camshaft Sensor Circuit Intermittent Causes and Fixes

What's Unique About the 2014-2018 Ram 3500

On this generation of Ram trucks, P0344 is a notoriously tricky code. Chrysler issued at least two Technical Service Bulletins (TSBs) that, unusually, directed dealership technicians to call specific company engineers for guidance when dealing with this code. This suggests that a simple sensor replacement was often not the fix, and that a more complex, underlying issue like a chafed wiring harness was frequently the true cause, leading to misdiagnosis and repeat repairs. Owners should be highly suspicious of wiring problems, not just a bad sensor. On HEMI engines, this code can also be triggered by a low engine oil level, which affects the VVT (Variable Valve Timing) system and can mimic a sensor fault.

Diagnostic Flowchart

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

Symptoms You May Notice

• Check Engine Light is on
• Engine is hard to start or cranks but won't start.
• Engine stalls intermittently, sometimes while driving or when coming to a stop.
• Rough idle or engine misfires.
• Hesitation or lack of power during acceleration.
• Traction control light may illuminate intermittently along with the Check Engine Light.

Most Likely Causes

1. Damaged Camshaft Position Sensor Wiring or Connector 🔴 High Probability → Shop Engine Camshaft Position Sensor The engine bay environment with heat and vibration can cause wiring harnesses to chafe against brackets or other components, leading to intermittent shorts or opens. This is strongly implied by the manufacturer TSBs and corroborated by numerous owner forum posts. On HEMI engines, the harness can rub near the front of the engine; on Cummins, check the harness routing below the fuel injection pump and around the front of the engine.
   How to confirm: Visually inspect the entire length of the sensor's wiring harness for rubbing, melting, or cracked insulation. Pay close attention to where the harness is secured by clips or passes near metal brackets. Unplug the connector and check for corrosion, moisture, or bent pins.
   Typical fix: Repair the damaged section of wire with a quality splice and heat shrink. Clean corroded connectors with electrical contact cleaner and apply dielectric grease before reconnecting.
   Est. part cost: $5-$25
2. Faulty Camshaft Position Sensor 🔴 High Probability → Shop Engine Camshaft Position Sensor The sensor itself is a common failure item due to heat cycles and electronic degradation over time. However, many owners report that aftermarket sensors fail quickly or don't work at all, making OEM parts from Mopar (for HEMI) or Cummins highly recommended.
   How to confirm: After confirming the wiring is good, the sensor can be tested with a multimeter for proper resistance (if specified) or by watching the signal voltage with an oscilloscope while the engine is cranked. A common but potentially costly DIY method is to replace it, as it's often inexpensive. If replacing, use an OEM part to avoid introducing a new variable.
   Typical fix: Replace the camshaft position sensor with an OEM part.
   Est. part cost: $25-$100
3. Low Engine Oil Level (HEMI Engines) 🟡 Medium Probability On the 5.7L and 6.4L HEMI engines, the Variable Valve Timing (VVT) system uses oil pressure to adjust cam phasing. If the oil level is critically low, the system can't function correctly on startup, causing the camshaft position to be out of expected range and triggering a P0344 code, even if the sensor and wiring are perfectly fine.
   How to confirm: Check the engine oil level using the dipstick. If it is low, top it off to the correct level, clear the codes, and see if the issue returns.
   Typical fix: Add engine oil to the proper level. Investigate the cause of the low oil (e.g., consumption, leaks).
   Est. part cost: $10-$30
4. Weak Battery or Faulty Starter ⚪ Low Probability A failing starter can draw excessive voltage during cranking, or a weak battery can cause a voltage drop, creating electrical noise that interrupts the cam sensor's signal to the PCM. This is a common cause across many modern vehicles with sensitive electronics.
   How to confirm: Test the battery's voltage and load capacity. Check that battery terminals are clean and tight. If the issue only happens during startup, monitor system voltage while cranking; a drop below ~9.5V can cause issues.
   Typical fix: Replace the weak battery or faulty starter motor.
   Est. part cost: $150-$400

Rare But Worth Checking

• Damaged Camshaft Tone Ring: → Shop Engine Camshaft The tone ring is a toothed wheel on the camshaft that the sensor reads. If it's bent, cracked, or has debris on it, the signal will be erratic. This is less common but can happen, especially if other engine work has been performed. In one documented case on a 5.7L HEMI, worn timing chain guides caused enough slack for the timing to be off, triggering the code.
• Faulty Powertrain Control Module (PCM): → Shop Engine Control Module (ECM) A PCM failure is rare but possible. One forum user noted that a software update was part of the solution for their P0344 issue, suggesting a logic problem within the PCM. This should only be considered after all other possibilities, especially wiring, have been exhaustively checked.

Diagnosis Steps

1. Read all stored fault codes with an OBD-II scanner. Note any other codes that may be related, such as P0340 or P1524.
2. (HEMI Engines Only) Check the engine oil level. If low, top it off, clear the codes, and test drive before proceeding.
3. Perform a thorough visual inspection of the camshaft position sensor's wiring harness and connector. Follow the harness from the sensor back as far as possible, looking for any signs of chafing, melting, corrosion, or loose connections.
4. If any damage is found, repair the wiring. Clear the codes and test drive to see if the fault returns.
5. If the wiring appears intact, test the vehicle's battery and starting system to rule out voltage drop issues during cranking.
6. Using a multimeter with the key on, engine off, check for the correct reference voltage (typically 4.5V-5.2V) and a good ground at the sensor connector.
7. For definitive diagnosis, use an oscilloscope to monitor the sensor's square wave signal while cranking or running the engine. Look for dropouts, glitches, or an erratic waveform, which confirms an intermittent fault.
8. If the wiring and power/ground are good but the signal is bad, replace the camshaft position sensor with a high-quality OEM part (Mopar/Cummins).
9. If the code persists with a new OEM sensor and good wiring, the issue may be mechanical (e.g., tone ring, timing chain wear) or a rare PCM fault.

Parts You'll Likely Need

• Camshaft Position Sensor (OEM #6.7L Cummins: 4921686 or superseding 2872279. 5.7L/6.4L HEMI: 5149054AC or 5149141AF.) — This is the primary electronic component that fails or is replaced during diagnosis. On the 6.7L Cummins, the same sensor is often used for both the camshaft and crankshaft positions. It is highly recommended to use OEM parts to avoid repeat failures.
  Trusted brands: Mopar (for HEMI), Cummins (OEM), Bosch, Standard Motor Products
  OEM price range: $60-$120
  Aftermarket price range: $25-$50

Related Codes That Often Appear With This One

• P0340 — P0340 indicates a general malfunction in the camshaft position sensor circuit, while P0344 specifies an intermittent fault. They often appear together as the intermittent problem becomes more persistent.
• U1424 — This is a network code for 'Implausible Engine Torque Signal Received'. It can be a secondary code triggered by the P0344, as the faulty cam signal prevents the PCM from accurately calculating engine performance.
• P1524 — This code relates to the oil pressure being out of range, often seen on HEMI engines. It can appear with P0344 when a low oil level is the root cause, affecting both the VVT system (triggering P0344) and the oil pressure reading.

Technical Service Bulletins (TSBs) & Recalls

• 68080819A: "Camshaft Position Sensor If replacing a camshaft position sensor for P0340 and/or P0344 fault codes, please review information below and contact Andrew Action..."
• 05149141A: "Camshaft Position Sensor If replacing a camshaft position sensor for P0340, P0344...fault codes, please review information below and contact Tom Nies..."

Platform-Specific Known Issues

• Chrysler TSB #68080819A and #05149141A specifically address P0344 on 2014 models. They instruct technicians to contact specific engineers before replacing the camshaft position sensor, indicating a known issue with misdiagnosis where the root cause was often not the sensor itself.
• On 5.7L and 6.4L HEMI engines, a critically low engine oil level can cause the VVT system to malfunction, which in turn sets a P0344 code. Always check the oil level before beginning repairs for this code on a HEMI.

Mechanic-Grade Diagnostic Values

• Camshaft Position Sensor 5V Supply Voltage — expected: 4.5 - 5.2 Volts. Failure: Voltage below 4.5V or above 5.2V indicates a problem in the supply circuit or PCM.
• Camshaft Position Sensor Signal Circuit Resistance (to PCM) — expected: Below 5.0 Ohms. Failure: Resistance above 5.0 Ohms indicates excessive resistance in the signal wire.
• Camshaft Position Sensor Signal Circuit Resistance to Ground — expected: Above 100 Ohms. Failure: Resistance below 100 Ohms indicates a short to ground in the signal circuit.
• Camshaft Position Sensor Signal (Oscilloscope) — expected: A clean square wave pattern that changes with engine RPM.. Failure: Glitches, dropouts to zero, or a complete flatline signal while the engine is cranking/running indicates an intermittent fault.

Scan Tool Commands That Help

• wiTECH (Dealer Tool): Cam/Crank Relearn — Required after replacing major timing components, the engine, or sometimes after replacing the cam/crank sensors to re-synchronize the signals for the PCM.
• wiTECH (Dealer Tool): ECU Reset — Often performed in conjunction with the 'Cam/Crank Relearn' function to clear adaptive values from the Powertrain Control Module before the relearn process begins.

Wiring & Ground Locations

• Camshaft Position Sensor (CMP) Signal at PCM — For Cummins engines, this corresponds to Pin 24 on the ECM connector.. Allows a technician to test the signal directly at the control module, bypassing all vehicle wiring to determine if the fault is in the harness or the PCM itself.
• Crankshaft Position Sensor (CKP) Signal at PCM — For Cummins engines, this corresponds to Pin 22 on the ECM connector.. Useful for diagnosing an edge case where an intermittent crankshaft sensor signal is causing the PCM to incorrectly flag the camshaft sensor with a P0344 code.
• Camshaft Position Sensor Location (6.7L Cummins) — Located on the left front of the engine.. This is the starting point for any visual inspection of the sensor, connector, and wiring harness.
• Crankshaft Position Sensor Location (6.7L Cummins) — Located on the lower front of the engine.. Important for inspection and potential replacement when a P0344 code cannot be solved by addressing the camshaft sensor or its wiring.

Real Owner Repair Stories

• YouTube channel 'Parts shooter' (Dodge 5.7L HEMI) — Intermittent Check Engine Light for P0344, stalling.
  ❌ Tried (didn't work) Replaced the camshaft position sensor with an aftermarket part. The code returned, although less frequently.
  ✅ What actually fixed it Replacing the CRANKSHAFT position sensor. The technician, following a tip from Identifix, theorized that electrical noise or a failing crank sensor was causing the PCM to misinterpret the cam signal. After replacing the crank sensor, the P0344 code was resolved.
• RamForum.com user (2010 Ram 1500 HEMI) — Immediate P0344 code and limp mode after starting.
  ❌ Tried (didn't work) Replaced Camshaft sensor with Mopar part., Replaced Crankshaft sensor with Mopar part., Replaced the Throttle Body., Verified voltage at the cam sensor connector.
  ✅ What actually fixed it The user did not post a final resolution, which is a common outcome highlighting the difficulty of this code. It implies the problem was likely a hard-to-find wiring issue or a rare PCM fault, as the common parts had already been replaced with OEM versions.

OEM Part Supersession History

• 4921686 → 2872279 — Standard part update/revision by the manufacturer.
  Heads up: No known incompatibility. Part number 2872279 is the correct current replacement for 4921686 for the 6.7L Cummins cam/crank sensor.