P1277 – OBD-II DTC

OBD-II DTC P1277 – Cylinder #2 High To Low Side Open

DTC P1277 meaning

DTC P1277 refers to a diagnostic trouble code indicating a high to low side open circuit condition in the fuel injector circuit for cylinder #2. This code is part of the On-Board Diagnostics II (OBD-II) system, which monitors various components of the vehicle’s engine and emissions systems. When the Engine Control Module (ECM) detects that the voltage level for the injector is not within the expected range, it triggers this code.

DTC P1277 symptoms

Common symptoms associated with DTC P1277 may include:

• Engine misfire or rough idling
• Decreased engine performance
• Increased fuel consumption
• Check Engine Light (CEL) illuminated
• Potential failure to start

DTC P1277 causes

Several factors can lead to the triggering of DTC P1277, including:

• Faulty fuel injector for cylinder #2
• Open or shorted wiring in the injector circuit
• Defective Engine Control Module (ECM)
• Corroded or loose electrical connectors
• Issues with the fuel delivery system

DTC P1277 seriousness

DTC P1277 is considered a serious issue as it can lead to engine performance problems and increased emissions. If left unaddressed, it may result in further engine damage or failure. It is advisable to diagnose and repair the issue promptly to ensure optimal vehicle performance and compliance with emissions regulations.

How to diagnose DTC P1277

To diagnose DTC P1277, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the P1277 code.
2. Inspect the wiring and connectors for cylinder #2 injector for any visible damage or corrosion.
3. Check the resistance of the fuel injector using a multimeter to ensure it is within specifications.
4. Test the voltage supply to the injector while the engine is running.
5. Examine the ECM for any faults or updates that may be necessary.

How to fix DTC P1277 step-by-step instructions

To fix DTC P1277, follow these step-by-step instructions:

1. Disconnect the battery to ensure safety while working on the electrical system.
2. Inspect and repair any damaged wiring or connectors in the injector circuit.
3. Replace the faulty fuel injector for cylinder #2 if it is found to be defective.
4. Reconnect the battery and clear the DTC using an OBD-II scanner.
5. Start the engine and monitor for any reoccurrence of the code.

How to erase DTC P1277

To erase DTC P1277, 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.
5. Disconnect the scanner and start the engine to ensure the code does not return.

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