Throttle position sensor (TPS) internally worn or faulty, producing an out-of-range voltage at rest; Loose, corroded, or damaged electrical connector at the TPS; Chafed, shorted, or open wiring in the TPS circuit between the sensor and the PCM; Throttle plate not fully closing due to carbon buildup on the throttle body bore; Improperly adjusted or sticking throttle linkage or cruise control cable holding the plate slightly open; PCM calibration issue or faulty PCM (rare, but possible after other causes are ruled out)

DTC codes / Ford codes / P1124

P1124 · FordThrottle Position Sensor Out of Self-Test Range

Q: What does code P1124 mean?

Throttle Position Sensor Out of Self-Test Range. P1124 on a Ford means the throttle position sensor (TPS) voltage fell outside the range the powertrain control module (PCM) expects during its key-on self-test, so the PCM cannot confirm the throttle plate is resting at the correct closed position. The computer compares the TPS signal against a calibrated window at ignition-on and flags the code when the reading is too high or too low for that moment.

P1124 on a Ford means the throttle position sensor (TPS) voltage fell outside the range the powertrain control module (PCM) expects during its key-on self-test, so the PCM cannot confirm the throttle plate is resting at the correct closed position. The computer compares the TPS signal against a calibrated window at ignition-on and flags the code when the reading is too high or too low for that moment.

SystemPowertrain

Code typeFord specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms
A slightly higher or lower than normal idle speed after startup
Hesitation or a brief stumble when accelerating from a stop
Poor throttle response or a lag when pressing the accelerator pedal
In some cases, the engine may enter limp mode with reduced power
Occasional stalling when coming to a stop or during low-speed maneuvers

Common causes, most likely first

Throttle position sensor (TPS) internally worn or faulty, producing an out-of-range voltage at rest
Loose, corroded, or damaged electrical connector at the TPS
Chafed, shorted, or open wiring in the TPS circuit between the sensor and the PCM
Throttle plate not fully closing due to carbon buildup on the throttle body bore
Improperly adjusted or sticking throttle linkage or cruise control cable holding the plate slightly open
PCM calibration issue or faulty PCM (rare, but possible after other causes are ruled out)

How to diagnose and fix it

Connect a scan tool and read TPS voltage with the key on and engine off to confirm it is outside the self-test window
Visually inspect the TPS connector and wiring for corrosion, looseness, or damage, and repair as needed
Clean the throttle body bore and plate to remove carbon deposits that prevent full closure
Check throttle linkage and cruise control cable for binding or incorrect adjustment, and correct as necessary
Backprobe the TPS signal, reference, and ground wires to verify voltages and check for opens or shorts
Replace the TPS if voltage is erratic or out of specification after wiring and mechanical checks
Clear the code and perform a key-on self-test to verify the repair, then road test to confirm no recurrence

Why a clean throttle body often fixes P1124

Carbon buildup on the throttle plate is a frequent cause of P1124 because it holds the plate slightly open, pushing the TPS voltage above the self-test limit even though the sensor itself is healthy.
A TPS that tests fine with a multimeter can still set P1124 if the PCM's self-test window is narrow and the sensor's closed-throttle voltage has drifted due to normal wear.
Technicians sometimes replace the TPS only to find the code returns because the throttle cable or cruise control linkage was holding the plate open; always check mechanical closure first.
P1124 can be set by a low battery or voltage drop during cranking, so verify battery condition and charging system before condemning the sensor.
On some Ford models, the TPS is integrated into the throttle body assembly, making cleaning and wiring checks even more important before considering replacement.

Can I keep driving with P1124?

You can usually drive the vehicle short distances to a repair shop, but avoid aggressive acceleration or heavy loads because the PCM may be using a default throttle strategy that affects performance and emissions. If the engine idles poorly or stalls, have it checked promptly.

Tools that help

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