Short to voltage in the cylinder 10 injector wiring or a chafed harness; Faulty cylinder 10 injector with an internal short or fault; Corroded, damaged or loose injector connector or control unit connector terminals; Wiring fault between the injector and control unit, such as a short to another powered circuit; Faulty injector driver inside the engine control unit; Incorrect cylinder numbering or wrong part fitted after earlier repairs.

P0289

Cylinder 10 Injector A Circuit High.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
2: AreaFuel and air metering (injector circuit)
89: FaultThe specific fault in that area

What it means

P0289 is the generic code for a high condition in the injector circuit for cylinder 10. The engine control unit monitors the injector driver circuit and sets the code when the voltage or current it sees is higher than expected, which usually points to a short to voltage or a fault in the driver. It only applies to engines with ten or more cylinders, and the wording 'Injector A' and the circuit layout vary by manufacturer and engine.

Symptoms

Malfunction indicator lamp on
Misfire or rough running, mainly on one cylinder bank
Hesitation or loss of power
Engine running on fewer cylinders or in a limp mode
Poor fuel economy or fuel smell
Hard starting or an occasional stall

Possible causes

Short to voltage in the cylinder 10 injector wiring or a chafed harnesslikely
Faulty cylinder 10 injector with an internal short or faultlikely
Corroded, damaged or loose injector connector or control unit connector terminalspossible
Wiring fault between the injector and control unit, such as a short to another powered circuitpossible
Faulty injector driver inside the engine control unitrare
Incorrect cylinder numbering or wrong part fitted after earlier repairsrare

How to diagnose

Read all stored codes and freeze frame data, and note any other injector or misfire codes on the same bank
Check the manufacturer's data for which cylinder is number 10 and which injector circuit is 'A' on this engine
Visually inspect the injector connector and harness for chafing, heat damage, oil contamination and corrosion
Check connector terminals for tension, pushed-back pins and moisture
Measure the injector coil resistance and compare it with specification
Check the injector circuit for a short to voltage with the ignition off and the control unit disconnected, following the wiring diagram
Command the injector with a suitable test function or swap it with a known good cylinder to see if the fault follows it
Check the supply and ground to the control unit and, only after the wiring is proven good, consider the control unit driver

How to fix

Repair or replace the damaged wiring and fix the cause of the chafing
Replace the faulty cylinder 10 injector, with new seals as the manufacturer specifies
Clean or replace corroded or damaged connectors and terminals
Repair the short between the injector circuit and any powered circuit
Repair or replace the engine control unit if the driver is confirmed faulty, then carry out any required coding

Can I keep driving?

Medium severity

Short, gentle driving to a garage is usually possible, but a stuck or misfiring injector can wash oil from the bore and overheat the catalytic converter. Avoid heavy loads and book the repair soon.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.