P1289 – OBD-II DTC

OBD-II DTC P1289 – Aborted KOER – ICP Failure

DTC P1289 meaning

DTC P1289 refers to an “Aborted KOER – ICP Failure” in the On-Board Diagnostics II (OBD-II) system. This code indicates that during the Key On Engine Running (KOER) self-test, the system detected a failure related to the Injection Control Pressure (ICP) sensor or its circuit. The KOER test is designed to assess the engine’s performance and functionality while it is running, and a failure in this test suggests issues with the fuel injection system’s pressure management.

DTC P1289 symptoms

Common symptoms associated with DTC P1289 may include:

• Engine misfires or rough idling
• Decreased engine performance
• Difficulty starting the engine
• Increased exhaust smoke
• Check Engine Light (CEL) illuminated

DTC P1289 causes

Several factors can lead to the triggering of DTC P1289, including:

• Faulty ICP sensor
• Wiring issues or poor connections in the ICP circuit
• Faulty fuel injection control module
• Low oil levels or oil quality affecting the ICP
• Faulty high-pressure oil pump

DTC P1289 seriousness

DTC P1289 is considered a serious issue as it can lead to significant engine performance problems. If left unaddressed, it may result in further damage to the engine or fuel system components. It is advisable to diagnose and repair the underlying issues promptly to ensure the vehicle operates efficiently and safely.

How to diagnose DTC P1289

To diagnose DTC P1289, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the P1289 code.
2. Inspect the ICP sensor and its wiring for any visible damage or disconnections.
3. Check the engine oil level and quality, ensuring it meets the manufacturer’s specifications.
4. Test the ICP sensor using a multimeter to verify its output voltage and resistance.
5. Examine the high-pressure oil pump for proper operation.
6. Clear the DTC and perform a KOER test to see if the code reappears.

How to fix DTC P1289 step-by-step instructions

To fix DTC P1289, follow these step-by-step instructions:

1. Ensure the vehicle is parked on a level surface and the engine is off.
2. Check and top off the engine oil if necessary.
3. Inspect the ICP sensor and wiring for damage replace any faulty components.
4. Test the ICP sensor and replace it if it fails to meet specifications.
5. Examine the high-pressure oil pump and replace it if it is not functioning correctly.
6. Clear the DTC using an OBD-II scanner.
7. Start the engine and perform a KOER test to confirm the issue is resolved.

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