C1506 – Left front tire pressure trigger module performance (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.

C1506 means the TPMS system on your Dodge Charger has trouble confirming proper operation of the left front tire pressure trigger module. You will usually see a TPMS warning light and may lose reliable pressure readings. According to Dodge factory diagnostic data, this is a manufacturer-specific code defined as “Left front tire pressure trigger module performance.” In plain terms, the vehicle expected a normal TPMS “wake up/trigger and response” behavior at the left-front location, but the system did not see it. That points to a performance problem, not a guaranteed bad part.

🔍Decode any Dodge Charger VIN — free recalls, specs & safety ratings — free VIN decoder with NHTSA data

C1506 Quick Answer

On Dodge vehicles, C1506 sets when the TPMS cannot verify normal performance of the left front tire pressure trigger module. Start by confirming cold tire pressures match the door placard, then verify the trigger tool, wiring, and sensor response before replacing parts.

What Does C1506 Mean?

Official definition: “Left front tire pressure trigger module performance.” Practically, the TPMS warning may stay on because the system cannot reliably “excite” and read the left-front tire’s sensor during a trigger event. That matters because the module uses this response to identify the sensor and confirm that corner’s pressure reporting works when commanded.

What the module checks: the TPMS control logic commands a left-front trigger event and expects a valid sensor response within a normal time and quality window. Why it matters for diagnosis: a “performance” DTC can come from low tire pressure, a weak sensor battery, RF interference, a damaged trigger circuit, or a tool/relearn issue. The code points to a suspect area, not a confirmed failed component.

Theory of Operation

Under normal operation, each wheel’s TPMS sensor measures pressure and temperature. It transmits data by radio frequency to the vehicle’s receiver logic. During service, a TPMS trigger tool can “wake” a sensor so the vehicle can learn its ID and confirm it reports from the correct location.

C1506 sets when the left-front trigger function does not behave normally. The system may not wake the sensor, may not receive a clean response, or may see an unexpected response. A weak TPMS sensor battery, an incorrect relearn state, or a trigger/receiver path problem often causes this performance fault.

Symptoms

You will usually notice one or more of these TPMS-related symptoms on a Dodge Charger:

• TPMS lamp stays on or flashes, then stays on
• Pressure display missing, dashes, or “no reading” for one tire
• Intermittent fault TPMS works sometimes, then drops out after driving
• Relearn failure left-front position will not train during sensor learn
• Wrong location left-front reads another wheel’s pressure after rotation
• Chime/message “Service Tire Pressure System” type message (cluster wording varies)
• Cold-weather pattern fault appears more often in low temperatures

Common Causes

• Low or incorrect tire pressure: A pressure below the door-placard cold specification can prevent the left front trigger process from validating sensor response.
• TPMS sensor battery end-of-life: The wheel sensor uses a non-replaceable lithium battery that typically lasts 5–10 years, and a weak battery can cause slow or missing responses that look like a performance fault.
• Sensor not learned or wrong ID assigned: After rotation, wheel service, or module replacement, the system may look for the wrong sensor ID at the left front position and flag performance.
• RF interference or poor trigger coupling: Aftermarket electronics, nearby transmitters, or wheel/tire changes can reduce signal strength and disrupt the trigger-to-sensor handshake.
• Damaged TPMS sensor or incorrect installation: A cracked sensor housing, bent stem, or incorrect mounting angle can reduce transmit power and delay responses.
• Wheel/tire mismatch affecting sensor wake-up: Certain tire constructions, wheel coatings, or sealants can attenuate the trigger field and cause inconsistent activation.
• Connector corrosion at the trigger module or harness: Moisture intrusion raises resistance and degrades trigger output so the sensor response falls outside expected timing.
• Open/short/high resistance in trigger module power, ground, or control circuits: Wiring damage near the wheelhouse or along the chassis can reduce module output and create intermittent performance faults.
• Trigger module internal fault: An internal driver or logic fault can prevent consistent triggering even when power, ground, and wiring test good.

Diagnosis Steps

Use a calibrated tire pressure gauge, a scan tool that supports Dodge TPMS data and relearn, and a quality DVOM. Keep a wiring diagram and connector views handy for the TPMS/trigger circuits. A test light helps load circuits during checks. Plan for a short road test so the sensors transmit updated data.

1. Check actual cold tire pressure in all four tires with a calibrated gauge. Compare readings to the door-placard specification and correct any low or uneven pressures. Record the starting pressures so you can confirm the fix later.
2. Connect the scan tool and confirm C1506 status as pending, stored, or confirmed. Record freeze frame or failure records, focusing on ignition state, battery voltage, vehicle speed, and any TPMS-related DTCs. Freeze frame shows the conditions when the fault set, while a scan tool snapshot captures live data during your road test.
3. Run a full module scan and note which modules report TPMS or chassis faults. Verify the scan tool can communicate with the TPMS-related module(s) used on this Dodge platform. A missing module on the network changes the direction toward power, ground, or network issues.
4. Check for obvious tire/wheel causes before electrical work. Look for mismatched tire sizes, sealant use, recent wheel swaps, or physical damage near the left front wheel that could affect triggering.
5. Inspect the left front wheelhouse and chassis harness routing related to the trigger module circuit path. Focus on rub-through points, prior collision repairs, loose fasteners, and water intrusion. Fix any harness damage before deeper testing.
6. Check related fuses and power distribution feeds for the TPMS/trigger system. Do this before you back-probe any control module connector. A hairline fuse crack or poor fuse terminal tension can create intermittent performance faults.
7. Verify power and ground integrity to the trigger module using voltage-drop testing under load. Command any available TPMS test or trigger function with the scan tool, or use an appropriate load, then measure voltage drop on the power feed and ground. Keep ground drop under 0.1V with the circuit operating because a high-resistance ground can pass a continuity test and still fail under load.
8. Inspect trigger module and related connectors for backed-out pins, corrosion, and poor terminal tension. Perform a light tug test on suspect wires and check for green crust or moisture trails. Restore pin fit and clean or repair terminals as needed.
9. Use the scan tool to view TPMS data and compare the left front sensor’s reported pressure, temperature, and update rate to the other wheels. If the left front shows stale data or frequent dropouts, treat it as a response problem and continue with trigger and sensor validation. If all wheels show dropouts, suspect interference, a power/ground issue, or a central receiver problem depending on platform design.
10. Perform a relearn procedure if tire rotation, sensor replacement, wheel swap, or module service occurred. Follow the Dodge-specific relearn routine and confirm the system assigns the correct sensor ID to the left front position. After relearn, drive the vehicle long enough for sensors to transmit and update, since many systems require speed and time to refresh wheel data.
11. If the scan tool supports it, run an actuator or trigger test to command the left front trigger function and observe whether the sensor responds. If the command works on other corners but not the left front, prioritize the left front trigger circuit, connector condition, and module output. If no corners respond, return to power, ground, and system-level inputs.
12. Clear DTCs and perform a verification drive under similar conditions to the freeze frame. Recheck for pending versus confirmed status and confirm the TPMS data updates normally. A hard fault often returns quickly, while an intermittent performance fault may need multiple drive cycles to reset.

Professional tip: If C1506 returns as pending only, treat it as an intermittent performance issue and capture a scan tool snapshot during a drive over bumps or during turns. That snapshot often shows the exact moment the left front sensor stops updating. Use that time stamp to focus your harness inspection on movement-related rub points.

Possible Fixes

• Set tire pressures to placard spec and equalize side-to-side: Correct cold pressures first, then retest TPMS data update and code status.
• Perform TPMS relearn and verify left front sensor ID assignment: Complete the Dodge relearn routine after any wheel or sensor service and confirm the left front position matches the correct sensor.
• Repair wiring/connector issues at the left front trigger circuit path: Fix rub-through, corrosion, loose terminals, or water intrusion, then confirm proper trigger operation.
• Replace the TPMS sensor if battery or response proves weak: Replace the complete sensor when tests show low battery or inconsistent responses, since the battery is not serviceable.
• Replace the left front trigger module only after circuit verification: Confirm correct power/ground voltage-drop results and good wiring before condemning the module.
• Address RF interference sources: Remove or relocate interfering electronics and retest sensor response consistency.

Can I Still Drive With C1506?

You can usually drive a Dodge Charger with C1506, but you should treat the TPMS warning as a safety alert, not a nuisance. This code means the vehicle sees a performance problem with the left front tire pressure trigger function, so the system may not reliably wake up, identify, or validate that tire’s sensor during a check. The car will still steer, brake, and accelerate normally. However, you lose a key safeguard against underinflation, overheating, and tire damage. Before any further driving, verify cold tire pressures in all four tires with a calibrated gauge. Inflate to the door-placard specification and recheck for slow leaks. If the warning persists, avoid high-speed driving and heavy loads until you confirm sensor data and system operation.

How Serious Is This Code?

C1506 usually ranks as a moderate severity chassis code. It rarely creates immediate drivability problems. The real risk comes from what you might miss. A tire can run low without a dependable warning, which increases stopping distance and heat buildup. In severe cases, it can contribute to a blowout. If the Charger shows a flashing TPMS lamp that later stays on, the system likely has a fault rather than low pressure. Treat that as more urgent because the system may stop reporting accurate pressures. You should also take it seriously if temperatures swing, if you recently changed wheels, or if the tire loses air. Those conditions raise the chance of tire damage.

Common Misdiagnoses

Technicians often replace a TPMS sensor immediately because the code mentions the left front position. That wastes money when the real issue is pressure imbalance, a wheel swap without relearn, or a weak sensor battery that only fails intermittently. Another common mistake involves trusting dash readings without verifying cold pressures with a gauge. Shops also miss connector and wiring issues at the TPMS receiver or related harness routing because the sensor “looks fine.” Improper relearn procedures cause repeat comebacks, especially after rotations. Finally, some assume a module failure without checking scan tool data, signal plausibility, and whether the system can see any sensors consistently. Verify inputs and communication first, then choose the repair.

Most Likely Fix

The most frequent confirmed repair directions for C1506 on a Dodge Charger involve restoring reliable sensor identification and wake-up performance for the left front tire location. Start by correcting all four cold tire pressures to the door-placard specification and addressing any leaks. Next, perform the correct TPMS relearn after any wheel change, sensor replacement, or rotation. If the left front sensor shows intermittent dropouts or weak transmission compared to others, a depleted internal sensor battery becomes likely. TPMS sensor batteries are not serviceable, so replacement of the sensor follows verification. Do not commit to a sensor or module until scan tool data, relearn results, and basic circuit checks support that conclusion.

Repair Costs

Repair cost depends on whether the confirmed root cause is wiring, connector condition, a sensor, a module, or the labor needed to diagnose the fault correctly.