Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer is getting a signal that the power supply to the turbo boost controller on one side of the engine is too weak.
The engine control module (ECM) has detected that the voltage supply to the boost pressure positioner on Bank 2 is below the expected level.
The P1277 code indicates a problem with the electrical supply to the boost pressure positioner on Bank 2 of the engine. This positioner is responsible for controlling the turbocharger's boost pressure. If the supply voltage is too low, it may not function correctly, leading to performance issues.
• Reduced engine performance
• Check Engine Light illuminated
• Poor acceleration
• Possible engine stalling
• Faulty boost pressure positioner
• Wiring issues such as shorts or open circuits
• Defective ECM
• Blown fuse or relay
• Corroded or loose electrical connections
Boost Pressure: The increased pressure in the intake manifold produced by a turbocharger.
Positioner: A device that adjusts the position of a component, such as a turbocharger wastegate.
• Check for any other related diagnostic trouble codes.
• Inspect the wiring and connectors to the boost pressure positioner.
• Test the voltage supply to the boost pressure positioner.
• Check the fuse and relay related to the boost control system.
• Repair or replace damaged wiring or connectors.
• Replace the boost pressure positioner if faulty.
• Replace blown fuses or faulty relays.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $500
Moderate
• Ford F-150
• BMW 3 Series
• Volkswagen Golf
• Regularly inspect and maintain electrical connections.
• Ensure proper maintenance of the turbocharger system.
• Use quality replacement parts.
Sensor Issue
• Do not ignore the Check Engine Light; have the vehicle inspected.
• Avoid heavy acceleration until the issue is resolved.
Check with the vehicle manufacturer for warranty coverage on emissions-related components.
This code has been associated with issues in vehicles with turbocharged engines, particularly those with complex electronic boost control systems.
Moderate – While the vehicle may still be drivable, performance will be affected, and ignoring the issue could lead to further damage.
Driving with a Check Engine Light on may lead to increased emissions and can be illegal in some areas.
• Engine running
• Under load conditions
The boost pressure positioner is typically located near the turbocharger on Bank 2 of the engine.
Q: Can I drive with a P1277 code?
A: It's possible to drive short distances, but it's not recommended as it may cause further damage or reduced performance.
Q: What happens if I ignore this code?
A: Ignoring the code can lead to poor engine performance and potentially more expensive repairs in the future.
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