Open Circuit Code on 2016 Dodge Ram

The open circuit code on 2016 Dodge Ram is a common OBD-II diagnostic trouble code that signals a broken or disconnected electrical path in your truck’s sensor or wiring system. This code triggers your check engine light and can cause poor performance, reduced fuel economy, and drivability issues if left unchecked. In this guide, we break down exactly what causes open circuit codes, how to read them with a scan tool, and the most practical fixes you can do at home or with a mechanic.

If your 2016 Dodge Ram is flashing a check engine light and your diagnostic scanner is showing an open circuit code, you are not alone. This is one of the most common issues truck owners face, and it can be frustrating when you do not know what it means. But here is the good news: most open circuit codes are straightforward to diagnose and fix. Whether you are a DIY mechanic or just want to understand what your shop is telling you, this guide has you covered.

An open circuit code on 2016 Dodge Ram vehicles points to a break in the electrical path that a sensor or component relies on. Think of it like a garden hose with a kink in it. Water (or in this case, electrical current) cannot flow through properly, and the system throws a warning. The good news is that once you identify the broken link, the repair is usually simple and affordable.

In this article, we will walk through everything you need to know. We will cover what open circuit codes actually mean, the most common codes you will see on a 2016 Dodge Ram, the tools you need to diagnose them, and step-by-step fixes for each scenario. By the end, you will feel confident tackling this issue head-on.

Key Takeaways

• Open circuit codes mean a broken electrical path: A sensor or wire has lost its connection, causing the ECM to detect missing voltage or signal.
• Common causes include damaged wiring, corroded connectors, and blown fuses: These are the top culprits on the 2016 Dodge Ram.
• A diagnostic scan tool is essential: You need to read the specific DTC to pinpoint which circuit is open.
• Many fixes are DIY-friendly: Replacing a connector, repairing a wire, or swapping a sensor can often be done in under an hour.
• Ignoring open circuit codes can lead to bigger problems: Poor fuel economy, engine misfires, and transmission issues can develop over time.
• Always clear codes after repairs and test drive: This confirms the fix worked and the code does not return.
• Some open circuit codes are urgent: Codes related to the transmission or fuel system should be addressed immediately.

What Does an Open Circuit Code Mean?

An open circuit code is a diagnostic trouble code (DTC) that tells your truck’s engine control module (ECM) there is a break in an electrical circuit. In simple terms, something is disconnected, damaged, or broken in the wiring path between a sensor and the ECM.

Every sensor in your 2016 Dodge Ram sends a signal back to the computer. That signal travels through wires and connectors. If any part of that path is broken, the ECM cannot read the sensor. It then logs an open circuit code and turns on your check engine light.

How Open Circuits Differ from Short Circuits

It helps to understand the difference between an open circuit and a short circuit. An open circuit means the path is broken. Electricity cannot flow at all. A short circuit means the path is connected where it should not be, causing too much current to flow. Both trigger check engine lights, but they require different diagnostic approaches.

On the 2016 Dodge Ram, open circuit codes are more common than short circuits. This is because the wiring harness is exposed to heat, vibration, and road debris over time. Connectors can corrode, and wires can chafe against sharp edges and break.

Common Symptoms of an Open Circuit Code

When your 2016 Dodge Ram throws an open circuit code, you may notice some of these symptoms:

• Check engine light is on or flashing
• Reduced fuel economy or poor mileage
• Rough idle or engine misfires
• Transmission shifting issues or limp mode
• Gauge readings acting erratically (speedometer, temperature gauge, etc.)
• Difficulty starting the engine
• Poor acceleration or hesitation when pressing the gas

Some open circuit codes do not cause noticeable symptoms at all. You might only discover them during a routine emissions test or when the check engine light randomly comes on. Either way, you should always address them promptly.

Most Common Open Circuit Codes on the 2016 Dodge Ram

The 2016 Dodge Ram uses a standard OBD-II system, which means it generates specific codes for different circuits. Here are the most common open circuit codes you will encounter.

Fuel System Open Circuit Codes

Codes in the P0000 to P0099 range deal with fuel and air metering. The most frequent open circuit codes on the 2016 Dodge Ram include:

• P0087 – Fuel Rail/System Pressure Too Low (open circuit in fuel pressure sensor)
• P0190 – Fuel Rail Pressure Sensor Circuit Malfunction
• P0191 – Fuel Rail Pressure Sensor Circuit Range/Performance

These codes often point to a faulty fuel pressure sensor, a damaged wiring harness running along the fuel rail, or a corroded connector at the sensor. The fuel system is critical, so do not ignore these codes.

Sensor Open Circuit Codes

Your 2016 Dodge Ram has dozens of sensors. When any of them lose their electrical connection, an open circuit code appears:

• P0115 – Engine Coolant Temperature Sensor Circuit Malfunction
• P0135 – Oxygen Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
• P0335 – Crankshaft Position Sensor Circuit Malfunction
• P0340 – Camshaft Position Sensor Circuit Malfunction
• P0420 – Catalyst System Efficiency Below Threshold (can be related to open O2 sensor circuits)

Each of these sensors needs a complete electrical circuit to function. When a wire breaks, a connector pulls apart, or corrosion builds up, the circuit opens and the code appears.

Transmission Open Circuit Codes

The transmission on the 2016 Dodge Ram is electronically controlled, which means it relies on solenoids and sensors with complete circuits:

• P0700 – Transmission Control System Malfunction
• P0741 – Torque Converter Clutch Circuit/Open
• P0751 – Shift Solenoid A Malfunction

Transmission open circuit codes should be taken seriously. They can lead to harsh shifting, slipping, or the transmission going into limp mode, which limits your speed and performance.

Tools You Need to Diagnose Open Circuit Codes

Diagnosing an open circuit code on your 2016 Dodge Ram does not require expensive professional equipment. Here is what you will need:

Essential Tools

1. OBD-II Scan Tool – A basic scan tool that reads and clears DTCs. A Bluetooth OBD-II adapter paired with a phone app works great and costs under $30.
2. Digital Multimeter – This is your most important tool. You will use it to test for voltage, resistance, and continuity in the circuit.
3. Wiring Diagram for Your Specific Engine – The 2016 Dodge Ram comes in several engine options (4.7L, 5.7L HEMI, 6.4L HEMI, EcoDiesel). Make sure you have the correct diagram.
4. Basic Hand Tools – Screwdrivers, pliers, and a wiring pick to access connectors.
5. Connector Cleaner and Electrical Tape – For cleaning corroded pins and sealing repaired wires.

Optional but Helpful Tools

• Backprobe Pins – These let you test sensor connectors without unplugging them.
• Circuit Tester Light – A quick way to check if power is reaching a connector.
• Wire Tracing Kit – Helps you follow a wire path through the harness if it is not obvious.

Having the right tools makes the job much faster and less frustrating. You do not need to buy everything at once. Start with a scan tool and a multimeter, and add tools as needed.

Step-by-Step Diagnosis Process

Diagnosing an open circuit code follows a logical process. Here is exactly how to do it on a 2016 Dodge Ram.

Step 1: Read the Code and Note the Circuit

Plug your scan tool into the OBD-II port under the dashboard. Read the code and write it down. The code tells you which system and which sensor circuit is affected. For example, P0115 points to the coolant temperature sensor circuit.

Step 2: Visual Inspection

Before you start testing, do a visual inspection. Look at the connector for the sensor that the code references. Check for:

• Pushed-out pins in the connector
• Corrosion or green/white buildup on the pins
• Broken or melted wires near the exhaust or engine
• Loose connectors that are not fully seated
• Damaged harness where wires chafe against metal edges

Often, a simple visual inspection reveals the problem. A pin that popped out of a connector or a wire that rubbed through is the easiest fix of all.

Step 3: Test for Continuity

Set your multimeter to continuity mode. Disconnect the connector at the sensor end. Place one probe on each pin of the connector. You should get a beep, indicating the circuit is complete. If you do not get a beep, the circuit is open, and you need to trace the wire to find the break.

Step 4: Test for Resistance

Set your multimeter to resistance (ohms). Measure the resistance across the sensor connector. Compare your reading to the specification in your repair manual. A very high or infinite resistance confirms an open circuit.

Step 5: Test for Voltage

Reconnect the connector and turn the key to the ON position (do not start the engine). Use your multimeter in voltage mode to check if the sensor is receiving reference voltage from the ECM. If there is no voltage, the open circuit is likely in the wiring between the ECM and the connector, not at the sensor itself.

Following these steps systematically eliminates guesswork. You will know exactly where the break is and what needs to be repaired.

Common Fixes for Open Circuit Codes

Once you have diagnosed the open circuit, here are the most common fixes for the 2016 Dodge Ram.

Repairing Damaged Wiring

If you find a broken wire, you can repair it by cutting out the damaged section and splicing in a new piece of wire. Use solder and heat-shrink tubing for a strong, reliable connection. Avoid using twist connectors alone, as they can vibrate loose over time.

Replacing a Faulty Connector

If the connector itself is damaged or corroded beyond repair, replace it. You can buy replacement connectors at most auto parts stores. Simply cut off the old connector, strip the wires, and crimp on the new connector. Make sure the pin assignments match exactly.

Replacing the Sensor

Sometimes the sensor itself fails internally, causing an open circuit. If the wiring and connectors check out fine, the sensor is likely the problem. Replacement sensors on the 2016 Dodge Ram are widely available and typically cost between $20 and $100 depending on the sensor type.

Fixing a Blown Fuse

Some circuits are protected by fuses. If a fuse is blown, the circuit is open and the sensor cannot function. Check the fuse box under the hood and inside the cabin. Replace any blown fuses with the correct amperage rating.

Repairing Ground Wires

Many sensors rely on a good ground to complete their circuit. A corroded or loose ground wire can mimic an open circuit. Locate the ground point for the affected sensor and clean it with a wire brush. Make sure the connection is tight and free of corrosion.

Preventing Open Circuit Codes on Your 2016 Dodge Ram

You cannot prevent every open circuit issue, but you can reduce the chances of them happening with regular maintenance and good habits.

• Inspect connectors during oil changes – Look for signs of corrosion or loose pins at common sensor connectors.
• Protect wiring near hot components – The exhaust and engine heat can melt insulation and break wires over time. Use heat shields and loom where needed.
• Address check engine lights promptly – The longer you drive with an open circuit, the more stress you put on other components like the catalytic converter and transmission.
• Keep connectors clean – Spray electrical contact cleaner on connectors once or twice a year to prevent corrosion buildup.
• Avoid after-market wiring that is not properly installed – Poorly installed accessories like LED lights or sound systems can create open circuits or damage existing wiring.

Taking these simple steps can save you time and money. A little prevention goes a long way with the electrical system on your 2016 Dodge Ram.

When to See a Professional Mechanic

While many open circuit codes are fixable at home, some situations call for a professional. If you have checked the wiring and connectors and cannot find the break, the issue may be inside the ECM itself or in a wire hidden deep in the harness. Additionally, transmission open circuit codes and codes related to the powertrain control module should be handled by a qualified technician if you are not comfortable working on those systems.

A professional mechanic has access to advanced diagnostic equipment like oscilloscopes and manufacturer-level scan tools. These tools can pinpoint intermittent open circuits that come and go, which are the hardest to diagnose at home.

Final Thoughts

An open circuit code on 2016 Dodge Ram trucks is a common but manageable issue. With the right tools and a systematic approach, you can diagnose and fix most open circuit problems yourself. The key is to not ignore the check engine light. Every code your truck throws is a clue, and an open circuit code is one of the more straightforward ones to track down.

Start with a visual inspection, test with a multimeter, and work through the wiring step by step. Most repairs take less than an hour and cost under $50 in parts. Your 2016 Dodge Ram will run better, shift smoother, and get better fuel economy once the circuit is restored.

Do not let an open circuit code sit on your shelf as a reminder of something you meant to fix. Grab your scan tool, pop the hood, and get it taken care of. Your truck will thank you for it.

Frequently Asked Questions

What does an open circuit code mean on a 2016 Dodge Ram?

An open circuit code means there is a break in the electrical path between a sensor and the engine control module. The circuit cannot complete, so the ECM cannot read the sensor signal. This triggers the check engine light and logs a diagnostic trouble code.

Can I drive my 2016 Dodge Ram with an open circuit code?

In most cases, you can drive short distances, but it is not recommended. An open circuit can cause poor engine performance, reduced fuel economy, and potential damage to other components like the catalytic converter. Have the code diagnosed and repaired as soon as possible.

How much does it cost to fix an open circuit code on a 2016 Dodge Ram?

The cost depends on the cause. Simple fixes like repairing a wire or cleaning a connector cost under $50. Replacing a sensor typically runs $20 to $100. If the issue is in the wiring harness deep inside the truck, labor costs can push the total to $150-$300.

What is the most common open circuit code on the 2016 Dodge Ram?

The most common open circuit codes are related to the oxygen sensor (P0135), coolant temperature sensor (P0115), and crankshaft position sensor (P0335). These sensors have exposed wiring that is vulnerable to heat, vibration, and road damage.

Will an open circuit code clear itself?

No, an open circuit code will not clear itself. The break in the circuit must be physically repaired. Once fixed, you can clear the code with a scan tool, and the check engine light should stay off if the repair is successful.

Do I need a wiring diagram to diagnose open circuit codes?

Yes, a wiring diagram is extremely helpful. It shows you the exact path of the wire, the pin assignments at each connector, and the expected voltage and resistance values. You can find wiring diagrams in repair manuals, online databases, or from Dodge dealer service departments.