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DTC/P0122·Ford

P0122 on Ford: Causes, Symptoms and Fix Cost

Quick Answer
Moderate SeverityNot safe to driveFord

P0122 on a Ford means the ECU is seeing an abnormally low voltage on throttle position sensor circuit A, typically under 0.2V when it expects 0.5V to 4.5V. Most cars drop into limp mode with capped throttle.

Connect any standard Bluetooth OBD2 adapter to your Ford and Skanyx tells you what P0122 means on that engine, whether it is safe to keep driving, and what the fix should cost. Free on iPhone and Android.

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What does P0122 mean on a Ford?

The Quick Answer above is the generic definition. What follows is what is documented for the Ford models that log P0122, checked against manufacturer data and owner reports.

Ford F-150

2004-2010 (5.4L 3V Triton and 4.6L)

On these trucks the electronic throttle body wears at the sensor wiper track and starts reporting a low signal, and the APP (accelerator pedal position) sensor is also a known failure point. Check the harness where it passes near the intake manifold before ordering either part, because chafing there produces the same code.

What causes P0122 on a Ford?

Beyond the generic causes listed on the main P0122 page, these are the documented Ford-specific patterns:

Ford F-150Failed accelerator pedal position sensor rather than the TPS itself
Ford F-150Chafed harness where it passes near the intake manifold

How to diagnose P0122 on a Ford with OBD2

Follow these steps to pinpoint the root cause of P0122:

  1. Read all stored codes and note companion codes such as P0113, P0222, or P2135
  2. Watch live data for TPS1 voltage with key on, engine off. Below 0.2V confirms the low input
  3. Wiggle the throttle body connector and harness while watching live data to catch intermittent faults
  4. Backprobe the TPS signal, 5V reference, and ground pins with a multimeter. Reference should read 4.9 to 5.1V
  5. If reference and ground are good but signal stays near 0V, replace the TPS or throttle body
  6. If the 5V reference is missing, check the wiring back to the ECU for a short to ground
  7. After repair, clear codes and run the throttle body relearn per the manufacturer procedure
  8. Road test and confirm TPS voltage sweeps smoothly from ~0.5V at closed throttle to ~4.5V at WOT

How much does P0122 cost to fix on a Ford? (EUR)

Estimated repair costs for P0122 in EUR, compiled across makes. Expect Ford parts and labour towards the upper end of each range.

Repair Parts Cost Labor Cost Total Estimate DIY Difficulty
Clean and reseat throttle body connector €0–€10 €0–€40 €0–€50 Easy
Replace standalone throttle position sensor €30–€120 €40–€90 €70–€210 Easy
Replace electronic throttle body assembly €180–€550 €80–€180 €260–€730 Moderate
Repair damaged wiring or connector pins €10–€40 €60–€180 €70–€220 Moderate
ECU diagnosis and replacement (worst case) €400–€1200 €100–€250 €500–€1450 Professional

Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.

These codes commonly cluster with P0122 on Ford vehicles:

P0121FordP0123FordP0124P2135P0222

Looking for the full P0122 reference (all makes, full diagnosis flow, complete repair cost matrix)?

See the main P0122 guide
Skanyx · Ford

Diagnose P0122 on your Ford

Your car logged P0122. Skanyx reads it on any standard Bluetooth OBD2 adapter, tells you whether it is safe to keep driving, and breaks down the likely repair so you know the number before a shop quotes you. Free on iPhone and Android, and you do not need to be a mechanic to read it.

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