U1109 – Lost communication with LIN steering wheel controls (Dodge)

Dodge-specific code — factory diagnostic data

Last updated: April 10, 2026

Definition source: Dodge factory description · Autel MaxiSys Ultra & EV. Diagnostic guidance is based on factory-defined fault logic for this code.

U1109 means the steering wheel buttons may stop working, or work only sometimes, on your Dodge Charger. You may lose audio controls, cruise switches, or menu navigation at the wheel. According to Dodge factory diagnostic data, this code indicates the vehicle lost communication with the LIN steering wheel controls. This is a manufacturer-specific network code, so the exact module relationships can vary by platform. The good news is that U1109 rarely proves a “bad button” first. Most fixes come from finding a power, ground, connector, or LIN bus fault that breaks communication.

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U1109 Quick Answer

U1109 on a Dodge Charger points to a loss of LIN network communication with the steering wheel control switches. Diagnose the LIN wire, switch module power/ground, and connectors before replacing any parts.

What Does U1109 Mean?

Official definition: “Lost communication with LIN steering wheel controls.” In plain terms, a control module on the vehicle stopped hearing from the steering wheel switch electronics. In practice, the vehicle cannot trust steering wheel button inputs, so features tied to those buttons may fail or act intermittently.

What the module actually checks: the receiving module monitors expected LIN bus activity and valid switch messages. When those messages drop out for a calibrated time or fail validity checks, it stores U1109. Why that matters: the code points to a communication path problem first. It does not confirm a failed switch pack. You must prove the LIN bus and the switch module’s power and ground stay intact under real steering column movement.

Theory of Operation

On Dodge platforms that use LIN for steering wheel controls, the wheel buttons connect to a small electronics module that talks on a single-wire LIN network. A higher-level controller acts as the LIN master and requests data. The steering wheel control electronics respond with button status messages. The receiving module then routes those requests to other modules, like audio or cruise control, over the vehicle network.

U1109 sets when the LIN master stops receiving proper responses from the steering wheel control node. An open circuit, short, corrosion, or a loose clock-spring related connection can interrupt the LIN line. Low voltage to the steering wheel control node can also silence it. Intermittent faults often appear during turns or tilt adjustments because the harness and column parts move.

Symptoms

Symptoms usually affect steering wheel buttons and the technician’s ability to see related modules on a scan tool.

• Scan tool Steering wheel control data missing, not updating, or intermittent network-related faults alongside U1109
• Steering wheel buttons Audio, menu, phone, or cruise buttons inoperative or respond late
• Intermittent operation Buttons work until you turn the wheel or adjust the column
• Radio behavior No response to volume/seek inputs from the wheel, while radio face buttons still work
• Cruise control Cruise switches do not set or cancel from the steering wheel
• Warning messages Steering wheel control or “service” messages depending on cluster configuration
• Multiple U-codes Other communication loss codes appear if shared power or ground drops out

Common Causes

• Open LIN circuit to the steering wheel controls: A broken LIN wire stops message traffic, so the receiving module flags lost communication.
• Short to ground on the LIN wire: Grounding the LIN line holds it low and prevents valid data frames from forming.
• Short to power on the LIN wire: Power on the LIN line holds it high and blocks the master and slave from pulling the bus correctly.
• High resistance in a connector or splice: Corrosion or a loose terminal distorts the LIN signal and causes intermittent dropouts.
• Clock spring (steering wheel spiral cable) internal fault: A damaged ribbon path can open or short the LIN path as the wheel turns.
• Steering wheel control switch module failure: An internal fault can stop the LIN slave from responding to the master’s polls.
• Loss of power or ground to the steering wheel controls: A dead module cannot wake up and communicate on the LIN network.
• Low system voltage or unstable ignition feed: Voltage sag during crank or heavy loads can reset modules and drop LIN communication.
• Network gateway or receiving module issue: A module that manages or interprets LIN data can falsely report a loss if it resets or loses its own power/ground.

Diagnosis Steps

Use a scan tool that can run a full network scan and display Dodge module data. Bring a DVOM with min/max capture and back-probing pins. A wiring diagram matters here, since LIN routing varies by platform. Have a load tool or headlamp bulb for circuit loading. If available, use an oscilloscope for a clean LIN waveform check.

1. Confirm U1109 as stored, pending, or history. Record freeze frame and all related DTCs. For this communication code, focus on ignition state, vehicle speed, system voltage, and any other U-codes. Freeze frame shows when the fault set. A scan tool snapshot helps catch an intermittent dropout during a road test.
2. Run a full network scan and note which modules respond. Check whether the scan tool shows steering wheel control data or a related LIN device status. If multiple modules drop offline, diagnose power or main network issues first. A single missing function points you toward the LIN branch.
3. Check fuses and power distribution for circuits feeding the steering wheel control system and any module that reports the fault. Verify the fuse has power on both sides with the circuit loaded. Do not rely on visual fuse checks. A weak fuse connection can pass a continuity test and fail under load.
4. Verify power and ground integrity for the reporting module and the steering wheel controls circuit. Use voltage-drop testing under load, not just static voltage. Command an output or turn the ignition on to load the circuit. Keep ground drop under 0.1V with the circuit operating. Fix any high drop before chasing network faults.
5. Inspect the steering column and wheel-area harness routing. Look for pinch points, chafing, and prior repair work. Pay attention to tilt and telescope movement zones. Check for pulled terminals at connectors near the column and under the dash. Damage here often creates an intermittent U1109.
6. Inspect connector condition at the steering wheel controls, clock spring connections, and any intermediate connectors or splices on the LIN line. Look for green corrosion, moisture tracks, spread terminals, and partially seated locks. Perform a light tug test on the LIN wire at each terminal. A terminal that moves often causes a momentary open.
7. Test the LIN circuit for shorts with the ignition off. Disconnect the modules at both ends of the LIN segment when service information allows it. Check the LIN wire to ground and to battery positive for unwanted continuity. A short will hold the bus and force a loss of communication.
8. Check LIN bias and activity with ignition ON. Measure at an accessible point on the LIN wire while the circuit is powered, since bias only appears with ignition on. If you use a scope, look for digital activity rather than a fixed line. A flat line points to an open, a short, or a dead module. Do not treat ignition-off voltage readings as a valid reference.
9. Load-test the suspected LIN wire and its connections. Use an appropriate test load and monitor voltage drop across connectors and splices while wiggling the harness. Focus on the clock spring area while turning the wheel slowly lock-to-lock. If the fault appears only during steering input, the spiral cable becomes a primary suspect, but verify the circuit first.
10. Verify steering wheel control operation and scan data while you manipulate the harness. Watch for switches dropping out, button states freezing, or the LIN device status changing. Capture a scan tool snapshot at the moment the data drops. Compare it to freeze frame conditions to see if the failure repeats under similar voltage or motion.
11. After repairs, clear DTCs and rerun the network scan. Road test and operate steering wheel buttons through multiple wheel positions. Confirm U1109 does not return as pending or stored. If the monitor requires two trips to confirm, complete two drive cycles and recheck.

Professional tip: Treat U1109 as a circuit integrity problem until testing proves otherwise. A clock spring fault often looks like a “module failure,” but the root cause can be a single high-resistance terminal. Use voltage-drop tests and wiggle testing together. That combo finds failures that continuity tests miss.

Possible Fixes

• Repair LIN wire open or short: Restore correct routing and conductor integrity, then protect the harness from future chafe.
• Clean and tighten connectors: Remove corrosion, repair damaged terminals, and ensure full connector seating and lock engagement.
• Restore power or ground feeds: Repair fuse contacts, ignition feed issues, or ground points that fail voltage-drop testing.
• Repair or replace the clock spring after circuit proof: Replace only after you confirm an intermittent open or short through wheel rotation testing.
• Repair splice or junction point issues: Rebuild compromised splices using proper methods and strain relief.
• Replace a failed steering wheel control switch/module after verification: Confirm the LIN line and power/ground remain good before condemning the component.

Can I Still Drive With U1109?

You can usually drive a Dodge Charger with U1109 because the fault targets the LIN communication used by the steering wheel controls. The engine, transmission, and base braking typically keep operating. Expect some steering wheel buttons to stop working or work intermittently. Pay attention to anything that changes vehicle control, such as cruise control behavior or warning chimes that no longer respond. If the fault appears with multiple network codes, a dead instrument cluster, or repeated resets, park the vehicle and diagnose it. Network issues can spread and create no-start or stall concerns when they involve shared power, grounds, or gateway paths.

How Serious Is This Code?

U1109 ranges from inconvenience to a true network reliability concern. It stays minor when only steering wheel audio, phone, or menu switches drop out. It becomes more serious when cruise control functions behave unpredictably, cluster messages appear and disappear, or several modules log communication DTCs together. A LIN fault can point to a shorted switch module, water intrusion in the clockspring area, or a wiring rub that also affects other steering column circuits. Treat it as a safety issue if horn operation, driver warning indicators, or cruise cancel inputs act incorrectly. Confirm the network and power supply integrity before you trust the vehicle on long trips.

Common Misdiagnoses

Technicians often replace the steering wheel switch pod or clockspring first because the symptom sits in the steering wheel. That approach wastes money when the real problem is a poor ground, a backed-out terminal at the column connector, or a LIN wire shorted to voltage from chafed harness tape. Another common miss involves ignoring other stored U-codes and low-voltage history. A weak battery or charging issue can cause repeated module dropouts that look like a LIN failure. Avoid guesswork by confirming scan tool data, checking for consistent module wake-up, and performing connector inspection and voltage-drop testing under load before condemning any steering wheel component.

Most Likely Fix

The most common confirmed repair directions target wiring and connections, not parts. Start with repairing poor terminal fit, corrosion, or damage at the steering column connectors and the steering wheel control LIN circuit. Next, isolate the LIN branch by unplugging the steering wheel controls or related inline connectors, then rechecking communication and code behavior. If communication returns with a device unplugged, that device or its shorted wiring likely loads the LIN line. Only after you prove correct power, ground, and a healthy LIN signal should you consider replacing a steering wheel control module or clockspring assembly, followed by proper configuration if required.

Repair Costs

Network and communication fault repairs vary by root cause — wiring/connectors are often the source, but module-level repairs or replacements can be significantly more expensive.