Dodge C150D – Right Rear Tire Pressure Trigger Module Voltage High

Dodge-specific code — factory diagnostic data

Last updated: May 6, 2026

Definition source: Dodge factory description. Diagnostic guidance is based on factory-defined fault logic for this code.

C150D sets when the wireless control module sees the supply voltage at the right rear TPMS trigger module higher than its operating range. The trigger module is a small antenna and electronics package mounted in the wheel well that wakes the in-tire sensor and relays its data to the central module. A high-voltage reading typically indicates a wiring fault that has shorted the supply line to a higher-voltage source, or a failed trigger module reporting incorrect voltage.

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C150D Quick Answer

On a Dodge with trigger-module TPMS, C150D means the right rear trigger module is reporting an over-voltage condition on its supply circuit. Common causes are a short between the supply line and a battery feed in the harness, a failed trigger module, water intrusion at the wheel-well connector, or a damaged ground that allows supply voltage to climb. The TPMS warning light will typically be illuminated and pressure data from the right rear may not display.

The Diagnostic Procedure

You will need a scan tool that reads Dodge wireless control module codes, a DVOM, a TPMS sensor activation tool (helpful but not required for this fault), the appropriate wiring diagram, and basic hand tools to access the right rear wheel well.

1. Confirm C150D and inventory all TPMS-related codes. Faults at multiple wheels point at a wiring or central module problem rather than a single trigger module failure.
2. Check battery state of charge and charging system output. Low or unstable supply can cause modules to misreport supply voltage, especially during cranking and warm-up.
3. Raise the right rear of the vehicle safely and remove the inner wheel well liner enough to access the trigger module. Note the connector and harness routing — there is often a strain-relief loop near the body that can chafe.
4. Inspect the trigger module connector for water intrusion, road salt corrosion, and damaged terminals. The right rear is on the spray side of the rear tyre and accumulates contamination quickly.
5. With the key on, measure voltage at the trigger module power supply pin (with the connector still seated, backprobe). The reading should match the system voltage specification — check service data for the exact range. A reading well above battery voltage indicates a hard short to a higher-voltage source.
6. If the voltage at the connector is correct but the code persists, replace the trigger module — its internal voltage measurement reference has drifted and is reporting a high reading.
7. If the voltage at the connector is high, isolate the short. Disconnect the trigger module and re-measure at the harness. Trace the supply circuit back through the underbody to find where a short can have occurred — common points are at chassis bracket pass-throughs, near the fuel tank, and at any prior body repair.
8. Verify the trigger module ground integrity. A high-resistance ground can cause supply voltage to read elevated relative to the module’s reference point. Measure voltage drop on the ground circuit under load.
9. Repair the wiring fault, replace the trigger module if condemned, clear the code, and drive the vehicle to allow the TPMS to relearn and clear the warning light.

Common Causes

• Short between supply circuit and a higher-voltage source: Most common single cause. Often results from a chafed wire grounding to a constant-power circuit at a body or chassis pass-through.
• Failed trigger module: The module’s internal voltage reference drifts after years of moisture exposure and the module reports an incorrect supply voltage. Replacement is the fix.
• Water intrusion at the connector: The wheel-well-mounted connector sees direct spray from the tyre and accumulates road salt over time. Corrosion across pins creates abnormal voltage readings.
• Poor or open ground: A high-resistance ground at the trigger module shifts the module’s reference voltage. The module reads supply voltage as elevated even though the actual supply is normal.
• Recent body or suspension repair with miswired harness: Aftermarket subframe replacement or wheel-well work that clipped or rerouted the harness incorrectly.
• Wireless control module fault: Rare. The central module misreads voltages on multiple trigger modules — usually presents with codes at several wheels rather than just one.

Severity & Driving

C150D does not affect drivability. The engine, brakes, and steering work normally. You will lose tyre pressure monitoring at the right rear wheel and the TPMS warning light will be on. The vehicle will not warn you if that tyre starts losing pressure — you must check it manually with a gauge until the fault is repaired. In countries where TPMS is mandatory for inspection, the warning light may also cause an inspection failure. Repair before any long trip and check tyre pressures manually in the meantime.