P2138 on Ford: Symptoms, Causes & DIY Fix
Official technical diagnostic wire for fault code P2138 (P2138: Throttle/Pedal Position Sensor/Switch D / E Voltage Correlation) specifically affecting Ford vehicles (F-150, F-250 Super Duty, Explorer, Mustang, Escape).
1. Symptoms of P2138 on Ford
When the Engine Control Module (ECM/PCM) on your Ford logs fault code P2138, drivers commonly observe:
2. Most Likely Causes on Ford
Historical warranty claims and technical repair bulletins for Ford point to the following failure distribution:
3. Step-by-Step DIY Repair Guide for Ford
Interface with the diagnostic port or system console using verified scanning hardware. Record freeze-frame data, active sub-codes, and timestamps to isolate whether P2138 is static or intermittent. on Ford vehicles (F-150, F-250 Super Duty).
Visually inspect the physical component (Gas Pedal Position Sensor Assembly), connector pins, and associated wiring harnesses for signs of corrosion, thermal melting, or loose grounding clips. on Ford vehicles (F-150, F-250 Super Duty).
Measure reference voltages and resistance thresholds against manufacturer factory specifications. Replace any component failing nominal impedance tolerances. on Ford vehicles (F-150, F-250 Super Duty).
Install genuine OEM replacement hardware or execute registry / service commands. Ensure all mounting bolts are torqued to factory specifications. on Ford vehicles (F-150, F-250 Super Duty).
Erase the fault code from non-volatile memory. Perform a standard verification cycle (e.g. 15-minute mixed drive or system stress benchmark) to ensure monitors reset to 'Ready' state without recurrent fault flags. on Ford vehicles (F-150, F-250 Super Duty).
P2138 Guides by Ford Model
Select your specific Ford model below for exact OBD-II DLC port locations, wiring diagrams, and engine displacement specs:
Other Common Diagnostic Codes on Ford
Troubleshoot other high-frequency Check Engine Light fault codes reported across Ford vehicles:
4. Ford P2138 FAQs
What causes code P2138 to trigger on a Ford?
On Ford vehicles, P2138 is most frequently caused by Component aging, oxidation, or degraded internal circuit element (Gas Pedal Position Sensor Assembly) or Wiring harness abrasion, loose terminal pin, or ground voltage float. Factory sensor degradation or wiring harness wear near the engine bay are common factors.
Can I safely drive my Ford with code P2138?
No. Immediate shutdown / repair required to prevent permanent hardware destruction or total system lockup. Given that P2138 carries a Critical severity rating on Ford vehicles, we advise performing diagnostic scanning via the OBD-II port before extended driving.
How much does it cost to fix P2138 on a Ford?
DIY replacement parts typically range between $180 - $480 (DIY: $50 - $140). If serviced at an authorized Ford dealership, expect an additional $120–$250 in professional labor based on their $120/hr hourly rate.