P1399 Dodge: Understanding, Diagnosing, and Resolving This Trouble Code

The P1399 Dodge code is a generic On-Board Diagnostic (OBD-II) code that indicates an intermittent problem in the synchronization circuit between the camshaft position sensor (cam sensor) and the crankshaft position sensor. Essentially, your vehicle’s Powertrain Control Module (PCM) detects that the timing between these two vital signals is lost irregularly, but not consistently enough to trigger a more specific code. This fault can lead to engine performance issues, poor combustion, and even potential damage if left untreated. Understanding the causes, symptoms, and diagnostic process is crucial for any Dodge owner facing this problem.

What is the P1399 Code and What are its Symptoms?

The P1399 Dodge code triggers when the PCM perceives an inconsistency or loss of signal between the crankshaft sensor and the camshaft sensor during engine startup or operation. This synchronization is essential for precisely controlling fuel injection and spark plug ignition. Without it, the engine cannot operate optimally. Symptoms associated with this code are often intermittent at first but can become more pronounced:

• Hard starting or engine cranks but won’t start: The PCM cannot synchronize ignition and injection.
• Rough idle or stalling: The engine may shake, misfire, or even stall at idle or low speed.
• Loss of power and performance: A noticeable loss of power during acceleration is common.
• Increased fuel consumption: Inefficient combustion leads to higher gasoline consumption.
• Check Engine Light illuminates: The light turns on to signal the fault and stores the P1399 code in the PCM’s memory.

Main Causes of the P1399 Code on a Dodge

Several factors can cause a P1399 Dodge code. The intermittent nature of the problem often suggests an electrical connection issue or a failing component that hasn’t completely failed.

• Faulty camshaft position sensor: This is one of the most common causes. The sensor itself may be defective and sending an erratic or absent signal.
• Faulty crankshaft position sensor: Although less frequently the cause than the cam sensor, a failing crankshaft sensor can also trigger this code.
• Wiring or connector problems: Frayed, corroded, shorted, or loose wires in the circuit of either sensor are a very common cause of intermittent P1399.
• Internal mechanical issues: In rare cases, the problem can be mechanical. An excessively worn or incorrectly tensioned timing chain or belt can affect the timing between the crankshaft and camshaft.
• Ignition module or coil failure: On some models, a problem with the ignition system can be misinterpreted as a timing issue.
• Problem with the PCM: Although very rare, an internal failure of the engine control module itself is a possibility.

How to Diagnose and Repair a P1399 Code?

Diagnosing the P1399 Dodge code requires a methodical approach. It is highly recommended to use an OBD-II scanner capable of reading live data to observe the sensor signals.

Step 1: Visual Inspection

Start with a thorough inspection of all wiring and connectors associated with both sensors. Look for obvious signs of damage, corrosion, burning, or loose connections. Ensure the connectors are fully seated. This simple step often resolves the issue.

Step 2: Sensor Testing

Using a multimeter, you can test the sensor resistance (following the specifications in the repair manual for your specific Dodge model) to see if it is within the normal range. You can also test the sensor output signal with an oscilloscope for a more precise diagnosis, checking that the signal is clean and consistent when the engine is idling.

Step 3: Reference Check

Ensure the gap between the sensor and the reluctor ring (the toothed rotor it reads) is correct and that there is no metallic debris stuck to the sensor’s magnet that could disrupt the signal.

Step 4: Replacement and Road Test

If the visual inspection and tests point to a faulty sensor, replace it with an OEM quality or equivalent part. After replacement, clear the code with your scanner and perform a road test to ensure the P1399 code does not return and the symptoms have disappeared.

Conclusion: Don’t Neglect P1399

Although the P1399 Dodge code may sometimes seem harmless because it is intermittent, it signals an underlying problem that can affect your engine’s reliability and integrity. Ignoring this code can lead to more serious driving problems, complete breakdown, or costly damage. A systematic diagnostic approach, starting with the simplest and least expensive checks (wiring), will allow you to resolve the issue effectively and get your Dodge back on the road in perfect working order.