Dodge U110C Code: Lost Communication with Fuel Level Sensor [2026]

The U110C diagnostic trouble code on your Dodge vehicle indicates a “Lost Communication with Fuel Level Sensor” error. Specifically, the Powertrain Control Module (PCM) is no longer receiving data packets from the fuel level sending unit over the Controller Area Network (CAN) bus. This is not a standard sensor failure code like a P0463; it is a networking issue where the “conversation” between components has been interrupted.

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Practically, this means your fuel gauge will likely drop to empty or behave erratically, even if your tank is full. Because the PCM relies on fuel level data to run EVAP system monitors and calculate driving range, this code will trigger your Check Engine light. Ignoring this error leaves you at risk of stalling in traffic due to an empty tank, as the vehicle can no longer accurately report how much gas is left.

Technical Definition and Severity of the U110C Code

The U110C code is a “U-series” network code, meaning it resides in the communication layer of your Dodge’s electronics. In a modern Dodge Charger, Ram, or Durango, the fuel level sensor does not just send a simple voltage to a needle on the dash. Instead, the signal is often processed by a module—frequently the Totally Integrated Power Module (TIPM) or the Instrument Cluster—and then broadcast across the CAN bus for the PCM to read. When the PCM expects that data packet and finds a “void,” it stores the U110C code.

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The Criticality of Communication Signals

In most Dodge architectures, the fuel level signal travels through several “handshakes” before reaching the PCM. Understanding this path is vital for troubleshooting:

• The Sensor: A variable resistor inside the fuel tank that changes based on float height.
• The Wiring: Physical copper wires that carry that analog signal to a localized module.
• The CAN Bus: The digital highway where that analog data is converted into a digital message.
• The Receiver: The PCM, which listens for the message to manage fuel trim and emissions tests.

Is U110C a High-Priority Repair?

While U110C usually won’t cause an immediate “crank-no-start” condition, it is considered moderately severe. Beyond the inconvenience of a dead fuel gauge, the PCM will suspend certain self-diagnostic tests. This can prevent you from passing an emissions inspection. Furthermore, if the communication break is caused by a short in the CAN bus, it could eventually lead to other modules “falling off” the network, potentially causing more serious driveability issues.

Common Dodge-Specific Failure Points and TIPM Roles

Dodge vehicles from the mid-2000s through the late 2010s are notorious for specific electrical bottlenecks. If you are seeing U110C, your first instinct shouldn’t be to drop the fuel tank. Instead, you should look at the hubs where all your wiring converges. In many Dodge models, the primary culprit is the Totally Integrated Power Module, or TIPM.

The TIPM as a Gateway Failure

The TIPM is essentially a smart fuse box with its own internal circuit boards. It serves as the gateway for most communication on the vehicle. Because the TIPM is located in the engine bay, it is constantly exposed to heat cycles and moisture. Over time, internal relays or solder joints can crack. If the internal trace responsible for passing the fuel level data fails, the PCM will lose the signal, resulting in U110C. You should check for “green crust” or white powder on the underside of the TIPM connectors, as this indicates moisture intrusion that disrupts digital signals.

Corroded Pins at the PCM and Chassis Harness

Another common Dodge-specific failure point involves the PCM connectors. Depending on your model, the PCM might be located behind the passenger side headlight or tucked into a fender well. These locations make the wiring harness vulnerable to road salt and water. Specific points to inspect include:

• Connector C2 or C3: These often house the communication pins. Look for bent, recessed, or corroded pins.
• Chassis Ground G104: Many Dodge fuel systems share a ground point on the frame rail. If this ground is rusted, the sensor signal becomes too “noisy” for the CAN bus to translate.
• The Fuel Pump Connector: Located on top of the tank, this 4-pin or 5-pin connector often melts or corrodes due to its proximity to the road.

Digital vs. Analog Interference

You must distinguish between a dead sensor and a dead signal. If you have a scan tool, look for “Fuel Level Percentage” in the live data stream. If the data is “N/A” or “Error,” the network is the problem. If the data shows “0%” but you know the tank is full, the sensor or its immediate wiring is the culprit. Dodge vehicles frequently suffer from “chafing” where the wiring harness rubs against the transmission bellhousing or the frame, which can ground out the CAN bus wires (usually a twisted pair of white/blue or white/yellow wires), killing the communication entirely.

Diagnostic Challenges with CAN Bus Communication

The U110C code is unique because it is a “U-code,” which specifically refers to communication errors across the Controller Area Network (CAN Bus). Unlike a standard “P-code” that tells you a sensor is broken, a U110C indicates that the data message simply isn’t arriving. This makes diagnostics particularly tricky because the sensor itself might be functioning perfectly, but the “conversation” between the fuel module and the PCM has been interrupted.

Understanding Signal “Noise” and Interference

In most Dodge vehicles, CAN Bus wires are twisted together to prevent electromagnetic interference. If these wires become frayed or if the twist is compromised near a repair site, “noise” can enter the circuit. This noise acts like static on a radio, preventing the Fuel Level Sensor signal from being understood. Professionals often look for specific environmental factors that disrupt this data flow:

• High Resistance: Micro-corrosion inside a connector that slows down data packets until they “time out.”
• Signal Droppage: Occasional data loss caused by a vibrating harness or a loose engine mount tugging on a wire.
• Module Conflict: Another failing module on the same bus (like a bad ABS module) “clogging” the network with error messages, causing the fuel data to get lost in the shuffle.

Intermittent vs. Hard Faults

One of the biggest headaches with the U110C is its tendency to be intermittent. You might see your fuel gauge drop to empty and the check engine light pop on, only for it to function normally the next morning. These “ghost” codes are often the result of temperature changes expanding and contracting metal pins in the wiring connectors. This is a common quirk in older Ram trucks and Durangos, where moisture and heat cycles eventually take a toll on the integrity of the terminal pins.

Critical Components in the Fuel Level Monitoring Path

To successfully resolve a U110C code, you have to look beyond the fuel tank. The signal travels through a specific pathway of hardware, and any one of these components can be the culprit. Understanding the architecture of your Dodge’s electrical system is half the battle in identifying the breakdown point.

The Fuel Pump Assembly and Sending Unit

While the code points to communication, the source of the data is the Fuel Level Sending Unit, which is typically integrated into the fuel pump module. In many Dodge applications, a float arm moves a rheostat that changes resistance based on the fuel level. If the “fingers” on this rheostat wear out or become coated in sulfur deposits from poor-quality fuel, the signal becomes erratic. Eventually, the computer deems the data unreliable and throws the U110C code to warn you that it can no longer trust the input.

The TIPM and PCM Connection

Dodge vehicles from the mid-2000s and early 2010s are famous for their Totally Integrated Power Module (TIPM). Think of the TIPM as the “brainy” fuse box of the vehicle. It often acts as a gateway for communication signals. If the internal circuitry of the TIPM begins to fail—often due to moisture intrusion or heat—it can stop relaying the fuel level data to the instrument cluster and PCM. Beyond the modules, pay attention to these physical weak points:

• Exposed Chassis Wiring: Harnesses that run along the frame rail are prone to road salt damage and debris impact.
• Grounding Points: Rusty or loose ground bolts on the frame that disrupt the return path for the sensor signal.
• Connector Pins: Receded or bent pins at the fuel pump pigtail connector, often caused by previous maintenance or rough terrain.

Final Thoughts on the U110C Code

Dealing with a U110C “Lost Communication” code in your Dodge can be frustrating, especially when your fuel gauge starts acting like it has a mind of its own. Remember, this code is less about a mechanical failure and more about a digital breakdown. By focusing on the health of the CAN Bus network and inspecting the physical wiring path between the fuel tank and the TIPM, you can narrow down the cause without unnecessarily replacing expensive modules.

Your next step should be a thorough visual inspection of the wiring harness for signs of wear or corrosion. If the problem persists, consider using a high-quality scan tool to check for other “U” codes that might point to a larger network issue. Stay patient, check your grounds, and you’ll have your Dodge back on the road with a reliable fuel gauge in no time!