P2289 OBD-II Trouble Code: Injector Control Press Too High-Engine Off

P2289 code definition

Injector Control Press Too High-Engine Off

What the P2289 code means

P2289 is an OBD-II code for the engine control module (ECM) detecting the injector control pressure (ICP) sensor is registering a fuel pressure that is above specifications with the engine off.

What causes the P2289 code?

• The ICP sensor or the FRP (Fuel Rail Pressure) sensor is not biased correctly and reading incorrect pressures.

• The ICP sensor is registering the engine off fuel pressure above specified fuel pressure range.

• There is a defective FRP sensor detecting higher than normal pressures

What are the symptoms of the P2289 code?

• The Check Engine Light will be illuminated and the code will set in the ECM memory as a fault.

• The engine may run normal if the pressures are normal and rich if the pressure is too high.

• The engine may run rich if the fuel pressures are above specified range.

How does a mechanic diagnose the P2289 code?

• Scans for codes and documents the code in the ECM, and looks at the freeze frame data for failure

• Follows the manufacture pinpoint test procedures and specifications for checking fuel pressures

• Follows the manufacture pinpoint testing for the ICP code received

• Checks fuel pressure at specified engine RPM levels and compares it to specifications using a gauge

• Compares test readings with a gauge to the sensor readings for the ICP and FRP

Common mistakes when diagnosing the P2289 code?

• Clearing ECM memory codes before checking the freeze frame data for the main failure problem, so the failure may be duplicated and repaired

• Failing to follow the manufacturer pinpoint tests for the application

• Replacing the ICP, assuming the part is the failure without verification

How serious is the P2289 code?

Code P2289 indicates the engine ECM is detecting the ICP not getting a normal fuel pressure when the engine is off, and that the pressure is too high above specifications. This can lead to injectors leaking after the engine is off and flooding the engine with fuel.

What repairs can fix the P2289 code?

• Replacing the injector control pressure sensor (ICP) or the fuel rail pressure (FRP) sensor

• Repairing the wiring or connection to the ICP or FRP signal return if there is an abnormal reading caused from corrosion in the connections

• Replacing the ECM

Additional comments for consideration regarding the P2289 code

Code P2289 is most commonly caused by a biased ICP internally, or a FRP signal biased differently causing a disparity between the two readings. The fuel pressure testing will show which one of the two is not registering correct pressures.

Need help with a P2289 code?

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