B1289 – OBD-II DTC

OBD-II DTC B1289 – Servo Motor Potentiometer Airintake Right Circuit Open

DTC B1289 meaning

DTC B1289 refers to a diagnostic trouble code indicating an issue with the servo motor potentiometer circuit for the right air intake. This code is triggered when the powertrain control module (PCM) detects an open circuit in the potentiometer that regulates the position of the servo motor, which is responsible for controlling airflow into the engine. An open circuit means that there is a break in the electrical path, preventing the proper signal from being sent to the PCM.

DTC B1289 symptoms

Common symptoms associated with DTC B1289 may include:

• Check Engine Light illuminated
• Reduced engine performance
• Inconsistent or poor engine idle
• Increased fuel consumption
• Unusual engine noises

DTC B1289 causes

Several factors can lead to the triggering of DTC B1289, including:

• Faulty servo motor potentiometer
• Damaged wiring or connectors in the circuit
• Corrosion or poor connections at the potentiometer or PCM
• Defective PCM
• Issues with the air intake system

DTC B1289 seriousness

DTC B1289 is considered a moderate to serious issue. While it may not cause immediate catastrophic failure, it can lead to reduced engine efficiency, increased emissions, and potential long-term damage if not addressed. It is advisable to diagnose and repair the issue promptly to maintain optimal vehicle performance.

How to diagnose DTC B1289

To diagnose DTC B1289, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the DTC.
2. Inspect the wiring and connectors associated with the servo motor potentiometer for damage or corrosion.
3. Check the resistance of the potentiometer using a multimeter to ensure it is within specifications.
4. Test the servo motor operation to ensure it is functioning correctly.
5. Examine the PCM for any signs of failure or damage.

How to fix DTC B1289 step-by-step instructions

To fix DTC B1289, 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 related to the servo motor potentiometer.
3. Replace the servo motor potentiometer if it is found to be faulty.
4. Reconnect all connectors and wiring securely.
5. Reconnect the battery and clear the DTC using an OBD-II scanner.
6. Test drive the vehicle to ensure the issue is resolved and the DTC does not reappear.

How to erase DTC B1289

To erase DTC B1289, 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 the trouble codes.
5. Confirm the action and wait for the scanner to complete the process.
6. Disconnect the scanner and start the vehicle to ensure the DTC has been cleared.

Recommended tools for OBD-II diagnostics

Explore our expert picks: The Best OBD2 Scanners for 2025

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.