mypros+
Error code reference

LG Range Error Code C-d1

Door locking information error (door lock motor or switch malfunction).

LG codesLG range codes

Door locking information error (door lock motor or switch malfunction).

First step from the service manual

Disconnect power. Remove harness connected with lock motor. Check micro switch (COM-NO) and measure resistance of lock motor coil (1750-1850 ohms at room temperature).

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

MyPros+ Max

Get the full diagnostic procedure for C-d1.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What C-d1 means on a LG range

The C-d1 error code on an LG range indicates a door locking information error, meaning the control board is not receiving the expected signal from the door lock assembly during a self-clean cycle or whenever the door latch mechanism is engaged. The door lock system consists of a lock motor that drives the latch mechanism and one or more micro switches that confirm the latch position. When these components fail to communicate the correct door position status, the control board throws C-d1 and halts operation to prevent an unsafe condition.

The lock motor is the most common point of failure in this system. At room temperature, a functioning lock motor coil should measure between 1750 and 1850 ohms. A reading significantly outside this range indicates a failed or degraded motor winding. The micro switch, which confirms the COM-to-NO contact state, can also fail mechanically if the contacts become worn, corroded, or physically damaged from repeated use. A failed switch will either remain open or closed regardless of door position, sending incorrect data to the control board.

Wiring harness issues can produce the same symptoms without any fault in the motor or switch themselves. A loose connector, a pinched wire near the hinge area, or a broken wire inside the harness can interrupt the signal path and trigger C-d1. Diagnosis should begin with a full power disconnect, followed by unplugging the harness from the lock motor and testing both the micro switch continuity and the motor coil resistance before suspecting the control board.

Source: manufacturer service documentation.

Common causes of C-d1

  1. 01

    Failed door lock motor

    Part replacement

    The lock motor coil can fail electrically, producing a resistance reading outside the 1750 to 1850 ohm specification when measured at room temperature. A shorted or open coil means the motor cannot drive the latch to its locked or unlocked position.

  2. 02

    Faulty micro switch

    Part replacement

    The micro switch inside the door lock assembly confirms latch position through its COM-to-NO contacts. If those contacts are worn, corroded, or stuck, the switch will report incorrect door status to the control board regardless of actual latch position.

  3. 03

    Loose or damaged wiring harness

    Wiring / connection

    The harness connecting the lock motor and switch to the control board can develop loose connectors or broken wires, especially near the door hinge area where repeated flexing occurs. Inspecting and reseating the harness connector is a required step before replacing components.

  4. 04

    Door latch mechanism physically obstructed or worn

    Wiring / connection

    Grease buildup, food debris, or mechanical wear can prevent the latch from fully engaging even if the motor and switch are functioning correctly. Inspecting the latch assembly for physical obstructions or worn components can reveal this cause.

  5. 05

    Control board not reading lock signals correctly

    Part replacement

    If the motor coil resistance is within spec, the micro switch tests correctly, and the wiring harness is intact, the control board itself may have failed and is misinterpreting or not receiving the lock signals. This is the least common cause and should only be considered after all other components are confirmed good.

See the test procedure for each cause

Frequently asked questions about C-d1

What does C-d1 mean on a LG range?
C-d1 is a door locking information error, indicating the control board cannot confirm the correct status of the door lock assembly. The fault points to the door lock motor, the micro switch that confirms latch position, or the wiring connecting these components. The range uses this signal to ensure the oven door is fully secured before or during a self-clean cycle. The appliance will not proceed with locking operations until the error is resolved.
Can I fix the C-d1 error myself?
A knowledgeable DIYer can perform initial diagnostics by disconnecting power, unplugging the lock motor harness, and testing the micro switch for continuity and the motor coil for resistance between 1750 and 1850 ohms using a multimeter. If a failed component is identified, replacing the door lock assembly is a moderately involved repair requiring removal of the back panel or door trim depending on the model. If wiring or the control board is suspected, professional service is recommended.
Is it safe to use my LG range with a C-d1 error?
Normal cooktop burner use is typically still available, but you should not attempt to run a self-clean cycle while C-d1 is active. The error exists specifically to prevent the oven from operating a high-heat cycle without a confirmed door lock, which is a safety function. Resolve the door lock fault before attempting any self-clean operation.
Will resetting my LG range clear the C-d1 error?
Disconnecting power for several minutes and restoring it may temporarily clear the error code from the display, but the fault will return if the underlying hardware problem is not corrected. A reset is useful for confirming whether the issue is intermittent or consistent, but it does not repair a failed motor, switch, or wiring connection.
How much does it cost to repair a C-d1 error on an LG range?
If the door lock motor and switch assembly needs replacement, the part typically costs between 40 and 120 dollars depending on the specific model. Adding professional labor for diagnosis and installation generally brings the total repair cost into the range of 150 to 300 dollars. If the control board is ultimately at fault, costs will be higher, often in the 200 to 450 dollar range for parts and labor combined.

Related LG range codes

All LG range codes
View all 39 LG range codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass