C1204 – OBD-II DTC

OBD-II DTC C1204 – ABS Outlet Valve Coil Rear Circuit Short To Battery

DTC C1204 meaning

DTC C1204 refers to a diagnostic trouble code indicating a short circuit in the ABS outlet valve coil rear circuit to the battery. This code is part of the On-Board Diagnostics II (OBD-II) system, which monitors various vehicle systems, including the Anti-lock Braking System (ABS). When the ABS control module detects an abnormal voltage level in the outlet valve coil circuit, it triggers this code to alert the technician of a potential issue.

DTC C1204 symptoms

Common symptoms associated with DTC C1204 may include:

• Illumination of the ABS warning light on the dashboard
• Loss of ABS functionality
• Increased stopping distances during braking
• Unusual noises from the ABS module or valves
• Potential activation of the traction control or stability control warning lights

DTC C1204 causes

Several factors can lead to the occurrence of DTC C1204, including:

• Wiring issues such as frayed or damaged wires in the ABS outlet valve circuit
• Corrosion or poor connections at the ABS module or valve connectors
• Faulty ABS outlet valve coil
• Short circuits caused by moisture intrusion or physical damage
• Defective ABS control module

DTC C1204 seriousness

DTC C1204 is considered a serious issue as it directly affects the vehicle’s braking system. The ABS system is crucial for maintaining vehicle control during emergency braking situations. If left unaddressed, this code can lead to:

• Increased risk of skidding or loss of control during braking
• Potential for accidents due to compromised braking performance
• Inability to pass vehicle safety inspections

How to diagnose DTC C1204

To diagnose DTC C1204, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the C1204 code.
2. Inspect the ABS outlet valve circuit wiring for any visible damage or corrosion.
3. Check the connectors for secure connections and signs of wear.
4. Test the voltage and resistance of the ABS outlet valve coil using a multimeter.
5. Examine the ABS control module for any fault codes or issues.
6. Perform a continuity test on the wiring to ensure there are no shorts to the battery.

How to fix DTC C1204 step-by-step instructions

To fix DTC C1204, follow these step-by-step instructions:

1. Disconnect the vehicle’s battery to ensure safety while working on the electrical system.
2. Inspect and repair any damaged wiring or connectors in the ABS outlet valve circuit.
3. Replace the ABS outlet valve coil if it is found to be faulty.
4. Clean any corrosion from connectors and ensure all connections are secure.
5. Reconnect the battery and clear the DTC using an OBD-II scanner.
6. Test drive the vehicle to ensure the ABS system is functioning correctly and the code does not reappear.

How to erase DTC C1204

To erase DTC C1204, 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 “Erase Codes” or “Clear DTCs” option on the scanner.
4. Confirm the action to clear the trouble codes from the vehicle’s memory.
5. Disconnect the scanner and turn off the ignition.
6. Start the vehicle and check if the ABS warning light remains off.

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