P1140 — Pedal Position Sensor A Circuit Intermittent

For Ford vehicles

water in fuel condition

powertrain (engine/transmission)

Is it safe to drive?

Short-term driving is OK In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.

How to diagnose with an OBD scanner

  1. Read the code and freeze frame Connect an OBD2 scanner, confirm P1140 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
  2. Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
  3. Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the pedal position sensor a for damage, corrosion, chafing or poor contact.
  4. Subsystem check Reproduce the fault: wiggle the harness and tap the pedal position sensor a while watching the live signal; heat and vibration usually make intermittent faults appear.
  5. Subsystem check Measure reference voltage, ground and signal continuity at the component connector.
  6. Subsystem check Wiggle-test the harness while watching the signal in live data — dropouts reveal broken wires.
  7. Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P1140 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for P1140 (parts and labor, USD, independent shop rates): Control module repair: $300–$1,000; Replace the faulty sensor or actuator: $150–$500; Repair wiring or connectors: $80–$250. Overall, fixing P1140 usually costs between $80 and $1,000. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

How do I diagnose P1140 myself?

Start with a scan: confirm P1140, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the pedal position sensor a, and verify the suspect component against live data before buying parts.

What is the most common cause of P1140?

The most common causes are: faulty sensor or actuator of the affected circuit, control module driver fault, poor ground connection.

Will P1140 clear itself?

Sometimes P1140 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

How much does it cost to fix P1140?

Control module repair — $300–$1,000; Replace the faulty sensor or actuator — $150–$500; Repair wiring or connectors — $80–$250. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

What are the symptoms of P1140?

Drivers most often notice: Check Engine Light on, the affected system operates intermittently or not at all, increased fuel consumption in some cases, possible limp mode depending on the affected component.

When your scan tool displays P1140, the engine control unit has identified an inconsistent signal issue within the pedal position sensor A circuit. This falls under the powertrain category of OBD2 codes, meaning it involves either engine management or transmission operations. The word "intermittent" is the key detail here — the ECU detected correct readings at times but also registered faulty ones, suggesting a physical problem rather than a permanently failed component. These types of faults are notoriously tricky because everything can appear normal during testing, yet the issue resurfaces once you drive away.

The pedal position sensor monitors how far you press the accelerator. The ECU relies on this input to calculate fuel delivery, throttle response, and in some cases transmission shift points. When the signal drops out or fluctuates unexpectedly, the module logs P1140 once the fault occurs enough times under specific driving conditions. The code will not set from a single glitch — the pattern must repeat. Freeze frame data captured alongside P1140 records engine load, RPM, coolant temperature, and vehicle speed at the exact moment of failure, which becomes your roadmap for reproduction during diagnosis.

Intermittent sensor faults almost always trace back to something mechanical: a loose terminal inside a connector, a wire broken beneath intact insulation, or a ground connection that loses contact when the engine moves during acceleration. These problems worsen with heat and vibration, which explains why symptoms may appear only after the engine warms up or during certain maneuvers. The ECU does not set this code lightly — it waited until the fault pattern confirmed itself, so take the warning seriously even if the check engine light is currently off.

Common symptoms of P1140

  • Check engine light is illuminated on the dashboard
  • The accelerator or related system operates inconsistently or fails to respond
  • Fuel economy may drop noticeably during the fault window
  • Limp-home mode activation is possible depending on which circuit is affected

What causes P1140?

  • A connector pin that is loose, backed out, or corroded
  • Intermittent contact due to engine vibration or thermal expansion
  • A wire broken inside its insulation with outer sheath still intact
  • Insufficient ground connection at the sensor or ECU
  • An internal driver fault within the control module
  • A blown fuse supplying power to the affected circuit
  • The pedal position sensor or its downstream actuator has failed
  • An open circuit or short-to-ground in the wiring harness

How to diagnose P1140

  1. Connect your OBD2 scanner and verify P1140 is stored in the ECU memory. Save the freeze frame data immediately — this snapshot contains engine load, RPM, temperature, and speed values at the moment the fault was recorded, which shows exactly what conditions triggered the code.

  2. Look for any other stored trouble codes. Related diagnostic trouble codes often point toward the root cause or confirm which section of the circuit is affected. Additionally, search manufacturer technical service bulletins for your specific make and model — some P0xxx codes have published factory fixes or software updates available through the manufacturer website or NHTSA database.

  3. Perform a thorough visual inspection of the wiring harness and connectors feeding the pedal position sensor. Look for damaged insulation, corrosion, bent pins, or any connector that shows signs of moisture intrusion or looseness.

  4. Actively reproduce the fault by gently wiggling the harness while monitoring live data from the sensor. Tapping on the sensor housing and operating the pedal can also trigger intermittent dropouts that confirm the problem location.

  5. Use a multimeter to check reference voltage, ground integrity, and signal continuity at the sensor connector with the harness disconnected. Compare your readings against manufacturer specifications.

  6. Clear the code after confirming your findings, then complete a full drive cycle including the specific conditions from the freeze frame data. P1140 should not return if the repair is complete.

How to fix P1140

Address the least expensive and most common failure points before considering component replacement:

  • Wiring repair or connector replacement: $80–$250
  • Pedal position sensor or related actuator replacement: $150–$500
  • Control module diagnosis and repair: $300–$1,000

How much does it cost to fix P1140?

The actual repair cost depends entirely on which component triggered the fault. Based on independent shop labor rates in the United States, here are typical scenarios for P1140 including parts and labor. Wiring harness repairs or connector replacements typically run $80–$250. If the sensor itself or its associated actuator has failed, expect to pay $150–$500 for the replacement. When the control module requires diagnosis or repair, costs jump to $300–$1,000 depending on whether it can be repaired or needs replacement. Overall, fixing P1140 usually falls between $80 and $1,000. Proper diagnosis before purchasing parts always saves money — the most expensive fix is rarely the first one to try.

Can you drive with P1140?

In most cases your vehicle remains drivable, though you may experience reduced performance or notice certain auxiliary functions disabled. If the malfunction causes stalling, prevents the engine from starting, or triggers warnings related to braking or steering, treat the situation as urgent and have it diagnosed immediately.

Related OBD2 codes