P0123 on Ford: How to Diagnose & Fix
Throttle/Pedal Position Sensor/Switch 'A' Circuit High Input
1 Ford model · 1 documented issue · 1 critical · $350-$700 repair
P0123 on Ford by model: symptoms, diagnosis and fix
The CD3 Edge uses a Ford electronic throttle body (ETB) with an integrated throttle position sensor. Non-conductive deposits build up on the internal sensor contacts, so the PCM sees an implausible or drifting throttle plate position and drops the vehicle into failsafe/limp mode - the amber wrench warning lights up and engine output is cut to near-idle power, often at highway speed with no warning. Owners describe the vehicle 'just quitting on me' merging or passing, sometimes clearing after a key cycle and then recurring more frequently. Cleaning the throttle bore does not fix it because the fault is on the electronic contacts inside the sealed unit, not carbon on the plate. Ford extended ETB coverage on other models (program 13N03, certain 2.5L and 3.0L vehicles) but not the Edge, whose 3.5L/3.7L ETB failures were the subject of class-action lawsuits, and the failure is heavily represented in NHTSA complaints for the Edge.
Common Symptoms
- Amber wrench warning light on the cluster
- Sudden loss of power / limp mode at speed
- Engine will not rev past idle until restarted
- Surging or erratic idle
- Intermittent stall at stops
- Fault clears after key cycle then returns
How to Fix
Replace the throttle body assembly with an updated Motorcraft unit - the internal fault cannot be repaired or cleaned out. Note the part number differs between 2007-2010 and 2011-2014 Edges, so order by VIN. After installation the PCM must relearn throttle position (KAM reset plus an idle relearn drive cycle). Check that the ETB connector and harness pins are not corroded or spread before condemning a second throttle body. Ford's extended ETB coverage did not include the Edge, so check your warranty status before paying out of pocket.
Sources for this issue (4)
- Throttle Body Service or Failure - 3.5L - Ford Edge Forumforum
- Throttle system limp mode issues HELP! - Ford Truck Enthusiasts Forumsforum
- Defective ETBs Are Sending Ford Vehicles into Limp Home Mode - FordProblemsarticle
- P0122 on 2007-2014 Ford Edge: Throttle Body Failure Causes, Symptoms, and Fixesarticle
P0123 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0123 mean on a Ford?
P0123 stands for "Throttle/Pedal Position Sensor/Switch 'A' Circuit High Input." This generic code means the PCM detected a higher-than-expected voltage from the throttle position sensor (or accelerator pedal position sensor) 'A' circuit. The computer uses this signal to know throttle/pedal opening for fuel, timing, and electronic throttle control, so an abnormally high reading disrupts those calculations. Symptoms can include erratic idle, hesitation, surging, poor or sudden acceleration, and limp-home mode, making prompt diagnosis important. On Ford it is documented across 1 model: Edge.
What are the most common causes of P0123?
The most common causes of P0123 are: Faulty throttle position sensor, Short to voltage in the TPS signal circuit, Open sensor ground causing high reading, Damaged or corroded TPS connector, Worn throttle body / TPS contacts, Chafed wiring shorting to a power wire, Faulty PCM (rare). The specific cause varies by vehicle.
How much does it cost to fix P0123 on a Ford?
Published repair estimates on Ford range from $350 to $700 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.