P1874 – OBD-II DTC

OBD-II DTC P1874 – Transmission Automatic 4-Wheel Drive Indicator (Lamp) Circuit Short To Battery

DTC P1874 meaning

DTC P1874 refers to a diagnostic trouble code that indicates a problem with the automatic transmission’s 4-wheel drive indicator circuit. Specifically, it signifies a short circuit to battery voltage within the circuit that controls the 4-wheel drive indicator lamp. This can lead to incorrect operation of the indicator light, which may not illuminate when it should or may remain illuminated when it should not.

DTC P1874 symptoms

Common symptoms associated with DTC P1874 may include:

• The 4-wheel drive indicator light is always on.
• The 4-wheel drive indicator light does not illuminate when engaged.
• Transmission shifting issues or erratic behavior.
• Potential loss of 4-wheel drive functionality.
• Other related warning lights may illuminate on the dashboard.

DTC P1874 causes

Several factors can lead to the occurrence of DTC P1874, including:

• A short circuit in the wiring of the 4-wheel drive indicator circuit.
• Faulty 4-wheel drive indicator switch.
• Damaged or corroded connectors in the transmission or transfer case.
• Issues with the transmission control module (TCM).
• Faulty transmission components affecting the indicator circuit.

DTC P1874 seriousness

The seriousness of DTC P1874 can vary based on the symptoms present. While it may not cause immediate safety concerns, it can lead to:

• Inability to determine the operational status of the 4-wheel drive system.
• Potential for further transmission issues if left unaddressed.
• Increased wear on transmission components due to improper operation.

It is advisable to diagnose and repair the issue promptly to avoid further complications.

How to diagnose DTC P1874

To diagnose DTC P1874, follow these steps:

1. Use an OBD-II scanner to confirm the presence of DTC P1874.
2. Inspect the wiring and connectors associated with the 4-wheel drive indicator circuit for damage or corrosion.
3. Test the 4-wheel drive indicator switch for proper operation.
4. Check for any additional DTCs that may provide more context to the issue.
5. Perform a visual inspection of the transmission control module and related components.
6. Use a multimeter to check for continuity and voltage in the circuit.

How to fix DTC P1874 step-by-step instructions

To fix DTC P1874, follow these step-by-step instructions:

1. Disconnect the battery to ensure safety while working on the vehicle.
2. Inspect and repair any damaged wiring or connectors in the 4-wheel drive indicator circuit.
3. Replace the 4-wheel drive indicator switch if it is found to be faulty.
4. Reconnect any connectors that were disconnected during inspection.
5. Reconnect the battery and clear the DTC using an OBD-II scanner.
6. Test drive the vehicle to ensure the 4-wheel drive indicator operates correctly and that the DTC does not reappear.

How to erase DTC P1874

To erase DTC P1874, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the ignition without starting the engine.
3. Navigate to the DTC menu on the scanner.
4. Select the option to clear or erase trouble codes.
5. Confirm the action and wait for the scanner to complete the process.
6. Disconnect the scanner and start the vehicle to verify that the DTC has been cleared.

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