Carbon buildup or sludge on the throttle plate and bore, restricting movement; Faulty throttle position sensor (TPS) or its electrical connector; Damaged or corroded wiring in the TPS circuit (signal, ground, or reference voltage); Sticking or binding throttle body assembly, including a worn internal motor or gear; ECM software issue or faulty ECM (less common); Intake air leaks after the throttle body affecting throttle position correlation

DTC codes / Nissan codes / P1243

P1243 · NissanThrottle Position Insufficient

Q: What does code P1243 mean?

Throttle Position Insufficient. P1243 on Nissan vehicles means the engine control module (ECM) has detected that the throttle position sensor signal does not change enough when the throttle valve is commanded to move. The computer expects the throttle plate to open or close a certain amount, but the sensor reports little or no corresponding movement, so the ECM flags the throttle position as insufficient.

P1243 on Nissan vehicles means the engine control module (ECM) has detected that the throttle position sensor signal does not change enough when the throttle valve is commanded to move. The computer expects the throttle plate to open or close a certain amount, but the sensor reports little or no corresponding movement, so the ECM flags the throttle position as insufficient.

SystemPowertrain

Code typeNissan specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering (injector circuits)

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms
Reduced engine power or limp mode, especially during acceleration
Hesitation or stumble when pressing the accelerator pedal
Unusual transmission shift behavior, such as harsh or delayed shifts
Poor fuel economy or rough idle in some cases

Common causes, most likely first

Carbon buildup or sludge on the throttle plate and bore, restricting movement
Faulty throttle position sensor (TPS) or its electrical connector
Damaged or corroded wiring in the TPS circuit (signal, ground, or reference voltage)
Sticking or binding throttle body assembly, including a worn internal motor or gear
ECM software issue or faulty ECM (less common)
Intake air leaks after the throttle body affecting throttle position correlation

How to diagnose and fix it

Inspect the throttle body for carbon buildup and clean it with approved throttle body cleaner
Check the TPS connector and wiring for corrosion, loose pins, or damage; repair as needed
Perform a throttle position sensor voltage sweep with a scan tool or multimeter to verify smooth operation
Compare commanded throttle position from the ECM to actual TPS reading to confirm the fault
Check for intake air leaks between the throttle body and engine
Replace the throttle body or TPS if cleaning and wiring repairs do not resolve the issue
Relearn the throttle position and idle air volume using a scan tool after repairs

Why throttle position codes often mislead

A dirty throttle body is the most common cause of P1243 on Nissan vehicles, and cleaning it often resolves the code without replacing any parts.
The code can set intermittently due to a loose TPS connector that only loses contact during engine vibration or temperature changes.
A failing accelerator pedal position sensor can mimic a throttle position problem, so always compare both pedal and throttle sensor readings.
After replacing the throttle body or TPS, a throttle relearn procedure is mandatory; skipping it will cause the code to return immediately.
Some aftermarket throttle bodies have calibration issues that trigger P1243 even when the part is new, so OEM or known-good used parts are safer.

Can I keep driving with P1243?

You can usually drive the vehicle to a repair shop, but avoid heavy acceleration or sustained high speeds because the engine may enter limp mode without warning. If the car feels unsafe or stalls, stop driving and have it towed.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

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