P1912 – OBD-II DTC

OBD-II DTC P1912 – Kickdown Hold Relay Open or Short Circuit to Ground

DTC P1912 meaning

DTC P1912 refers to a diagnostic trouble code indicating a problem with the kickdown hold relay in a vehicle’s transmission system. This code specifically points to an open circuit or a short circuit to ground within the relay circuit. The kickdown hold relay is responsible for controlling the transmission’s ability to downshift during acceleration, enhancing performance and responsiveness.

DTC P1912 symptoms

Common symptoms associated with DTC P1912 may include:

• Delayed or harsh shifting of the transmission
• Inability to downshift when accelerating
• Check Engine Light illuminated
• Reduced engine performance
• Transmission slipping or erratic behavior

DTC P1912 causes

Several factors can lead to the occurrence of DTC P1912, including:

• Faulty kickdown hold relay
• Wiring issues such as frayed or damaged wires
• Corrosion or poor connections in the relay circuit
• Faulty transmission control module (TCM)
• Software issues within the vehicle’s control systems

DTC P1912 seriousness

The seriousness of DTC P1912 can vary based on the symptoms experienced. While it may not cause immediate safety concerns, it can lead to:

• Decreased vehicle performance
• Increased wear on transmission components
• Potential for further damage if left unaddressed

It is advisable to diagnose and repair the issue promptly to maintain optimal vehicle operation.

How to diagnose DTC P1912

To diagnose DTC P1912, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the P1912 code.
2. Inspect the kickdown hold relay for any visible damage or corrosion.
3. Check the wiring and connectors associated with the relay for signs of wear or short circuits.
4. Test the relay operation using a multimeter to ensure it is functioning correctly.
5. Examine the transmission control module for any faults or software updates.
6. Clear the code and perform a road test to see if the code returns.

How to fix DTC P1912 step-by-step instructions

To fix DTC P1912, follow these step-by-step instructions:

1. Disconnect the vehicle’s battery to ensure safety while working on electrical components.
2. Locate the kickdown hold relay and inspect it for damage or corrosion.
3. If the relay is faulty, replace it with a new one.
4. Inspect the wiring harness and connectors for any signs of damage or corrosion repair or replace as necessary.
5. Reconnect the battery and clear the DTC using an OBD-II scanner.
6. Perform a road test to verify that the issue has been resolved and that the code does not return.

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