Broken, chafed, or disconnected wire in the manifold tune valve solenoid circuit; Corroded or loose electrical connector at the solenoid or at the PCM; Failed manifold tune valve solenoid (open or shorted internally); Seized or binding manifold tune valve actuator linkage, causing the solenoid to overheat and fail; PCM driver circuit fault, though this is less common than wiring or solenoid failure; Aftermarket or damaged intake components that interfere with the solenoid or its wiring

DTC codes / GM codes / P1289

P1289 · GMManifold Tune Valve Solenoid Circuit Open Or Shorted

Q: What does code P1289 mean?

Manifold Tune Valve Solenoid Circuit Open Or Shorted. P1289 on a GM vehicle means the powertrain control module (PCM) has detected an open or shorted circuit in the manifold tune valve solenoid, which is used on some engines to alter intake runner length or volume for better low-end and high-end torque. The PCM commands the solenoid on or off and monitors the circuit for expected voltage or current feedback; when the feedback falls outside the expected range, it sets this code and may disable the valve's operation.

P1289 on a GM vehicle means the powertrain control module (PCM) has detected an open or shorted circuit in the manifold tune valve solenoid, which is used on some engines to alter intake runner length or volume for better low-end and high-end torque. The PCM commands the solenoid on or off and monitors the circuit for expected voltage or current feedback; when the feedback falls outside the expected range, it sets this code and may disable the valve's operation.

SystemPowertrain

Code typeGM specific

SeverityLow

Fix difficultyIntermediate

AreaFuel and air metering (injector circuits)

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms
Slight loss of low-end torque or a subtle flat spot during acceleration
Rough or unstable idle quality on engines equipped with the manifold tune valve
Reduced fuel economy in some cases due to the PCM running a default tuning strategy
In rare cases, a mild hesitation when the PCM commands the valve to change position

Common causes, most likely first

Broken, chafed, or disconnected wire in the manifold tune valve solenoid circuit
Corroded or loose electrical connector at the solenoid or at the PCM
Failed manifold tune valve solenoid (open or shorted internally)
Seized or binding manifold tune valve actuator linkage, causing the solenoid to overheat and fail
PCM driver circuit fault, though this is less common than wiring or solenoid failure
Aftermarket or damaged intake components that interfere with the solenoid or its wiring

How to diagnose and fix it

Inspect the manifold tune valve solenoid connector and wiring for damage, corrosion, or looseness, and repair as needed
Measure the resistance of the solenoid with a multimeter and compare it to the manufacturer's specification to check for an open or shorted coil
Check for battery voltage and ground at the solenoid connector with the key on and the PCM commanding the valve, using a scan tool or test light
Perform a wiggle test on the harness while monitoring solenoid resistance or circuit voltage to reveal intermittent faults
If the circuit and solenoid test good, check the PCM connector for corrosion and verify the PCM driver operation with a bidirectional scan tool
Replace the manifold tune valve solenoid if it fails electrical or mechanical testing, and clear the code to verify the repair

Manifold tune valve circuit checks that save time

A stuck or carbon-fouled manifold tune valve can burn out the solenoid and set P1289, so always check that the valve moves freely before installing a new solenoid.
The PCM may set P1289 intermittently due to a wire that only breaks contact when the engine moves under load, so a simple static resistance check can miss the fault.
Some GM engines use the manifold tune valve only during specific operating conditions, so a failed solenoid may not produce any driveability complaint and the code can be the only clue.
A poor ground connection at the engine block or chassis can mimic a solenoid circuit fault, so verify ground integrity before condemning the PCM or the solenoid.
After replacing the solenoid, confirm the repair by commanding the valve with a scan tool and watching for the expected change in manifold absolute pressure (MAP) or intake air flow.

Can I keep driving with P1289?

You can generally continue driving with P1289 because the fault mainly affects intake tuning and does not create an immediate safety risk, but avoid heavy throttle or towing until the circuit is repaired to prevent worsening driveability or fuel economy.

Tools that help

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Guidance is general and written for GM vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.