What are the common causes of the P0120 code on a Lincoln?

cause_throttle_position, cause_wiring_damage, cause_connector_corrosion, cause_throttle_body

How much does it cost to fix the P0120 code?

The estimated repair cost for the P0120 code is $100 - $400. This includes parts and labor.

P0120Lincoln NautilusYıllar: 1996 - 2026

Throttle/Pedal Position Sensor/Switch A Circuit Malfunction

ASE Sertifikalı Teknisyen Tarafından İncelenmiştir

Araç Sürülür Mü?Driving with a P0120 code can be hazardous. The engine's computer relies on the TPS signal to accurately control fuel delivery, ignition timing, and transmission shift points. A faulty signal can lead to erratic idle, sudden loss of power, hesitation during acceleration, or the vehicle entering 'limp mode,' severely limiting speed and power. In some cases, it can cause the engine to stall unexpectedly, increasing the risk of an accident. It is advisable to diagnose and repair this issue promptly to ensure safe vehicle operation.

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Bu ne anlama geliyor?

Code P0120 indicates a malfunction in the Throttle Position Sensor (TPS) 'A' circuit. The PCM monitors the TPS to determine throttle blade angle.

Yasal Uyarı: Bu arıza kodu standart OBD2 sisteminin bir parçasıdır ve 1996-2026 yılları arasında üretilen Lincoln Nautilus modelleri için geçerli olabilir. Ancak bu spesifik kodun varlığı, aracınızın tam motor konfigürasyonuna ve üretim yılına bağlıdır.

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Yaygın Nedenler

Arızalı gaz kelebeği konum sensörü (TPS)

Hasarlı, aşınmış veya kopuk kablo tesisatı

Korozyona uğramış veya gevşek elektrik konnektörü

Kirli veya arızalı gaz kelebeği gövdesi

Dikkat Edilmesi Gereken Belirtiler

Motor Arıza Lambası yanar
Zayıf hızlanma veya gecikmeli tepki
Motor devir dalgalanması
Motor beklenmedik şekilde stop eder
Düzensiz veya değişken rölanti hızı
Araç düşük güç / acil moduna girer

Nasıl Teşhis Edilir

Begin with a thorough visual inspection of the Throttle Position Sensor (TPS) and its associated wiring harness. Look for any signs of physical damage, fraying, cuts, or pinched wires, especially where the harness might rub against engine components. Pay close attention to the electrical connector at the TPS itself and at the Powertrain Control Module (PCM). Disconnect and inspect the terminals for corrosion, bent pins, or loose connections. Clean any corrosion with electrical contact cleaner and apply dielectric grease upon reassembly if terminals are clean and secure.

With the ignition ON and engine OFF (KOEO), use a digital multimeter (DMM) or a capable scan tool to monitor the TPS 'A' signal voltage. Back-probe the signal wire at the TPS connector. At closed throttle, the voltage should typically be around 0.5V to 1.0V. Slowly open the throttle plate by hand (or have an assistant depress the accelerator pedal) to Wide Open Throttle (WOT). The voltage should increase smoothly and linearly, reaching approximately 4.0V to 4.8V at WOT, without any sudden drops, spikes, or flat spots. Any erratic readings, dead spots, or incorrect voltage ranges indicate a faulty sensor or circuit issue.

Still with KOEO, use your DMM to verify the 5-volt reference (Vref) signal and the ground circuit integrity at the TPS connector. Back-probe the Vref wire; it should read approximately 5.0V. Then, check the ground wire for continuity to a known good chassis ground (should read close to 0 ohms). A missing Vref or poor ground will directly cause a P0120. If Vref is absent, check the PCM's Vref output or for a short to ground in the Vref circuit. If the ground circuit shows high resistance, trace the ground wire back to its source.

If the TPS itself tests good and Vref/ground are present at the sensor, disconnect both the TPS and PCM connectors. Using your DMM, check for continuity and resistance on each wire (signal, Vref, ground) between the TPS connector and the PCM connector. Resistance should be very low, ideally less than 0.5 ohms. Also, check each wire for a short to ground and a short to power by checking resistance between each wire and chassis ground, and between each wire and a known 12V source. Wiggle the harness while performing these tests to identify intermittent connection issues that might not be apparent when the harness is static.

While P0120 is primarily a circuit malfunction, a physically sticking or binding throttle plate can sometimes cause the TPS to report erratic values if it's integrated or if the PCM detects an unexpected throttle angle for a given pedal input. Visually inspect the throttle body for excessive carbon buildup around the throttle plate, which could impede its smooth operation. Manually operate the throttle plate to ensure it moves freely without sticking or excessive resistance throughout its full range of motion. Clean the throttle body if significant carbon deposits are present.

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Replace the Throttle Position Sensor (TPS): This is the most common fix if the sensor itself is found to be faulty after voltage signal verification. Ensure the replacement part is of high quality, preferably OEM or a reputable aftermarket brand, as cheap sensors can quickly fail or provide inaccurate readings.

Repair or Replace Damaged Wiring/Connectors: If the diagnostic steps reveal damaged, corroded, or shorted wiring, or compromised connector terminals, these must be repaired or replaced. Use appropriate automotive-grade wiring and connectors, ensuring proper soldering and heat-shrink insulation for durable, long-lasting repairs.

Clean Throttle Body: If the throttle plate is sticking due to carbon buildup, it can put undue stress on the TPS or cause the PCM to interpret the sensor's output as erratic, especially if the sensor is integrated into the throttle body assembly. A thorough cleaning can restore smooth operation and prevent future issues.

PCM Software Update or Replacement: In rare cases, if all other components and wiring test perfectly, the issue might lie within the Powertrain Control Module itself. A PCM software update (reflash) might resolve a known calibration issue, or in extreme cases, the PCM may need to be replaced if its internal TPS driver circuit has failed. This should only be considered after exhausting all other diagnostic avenues.

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Diğer Popüler Lincoln Kodları

P0100 P0105 P0111

Throttle/Pedal Position Sensor/Switch A Circuit Malfunction

ASE Sertifikalı Teknisyen Tarafından İncelenmiştir

Bu ne anlama geliyor?

Code P0120 indicates a malfunction in the Throttle Position Sensor (TPS) 'A' circuit. The PCM monitors the TPS to determine throttle blade angle.

Nasıl Teşhis Edilir

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Bu ne anlama geliyor?

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Dikkat Edilmesi Gereken Belirtiler

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Diğer Popüler Lincoln Kodları

Scanning Engine...

Bu ne anlama geliyor?

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Dikkat Edilmesi Gereken Belirtiler

Nasıl Teşhis Edilir

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Diğer Popüler Lincoln Kodları