P0720 Code: Ford Focus (2012-2018) - Causes, Symptoms & Fixes

Code: P0720 on a 2012-2018 Ford Focus

Important data note

• Real NHTSA data provided for this request shows: No owner complaints found for this make/model/year/issue combination.
• Official recalls: No recalls found in NHTSA database for this make/model/year.
• No recalls or TSB citations are included here because they do not appear in the supplied data. This guide uses general automotive knowledge for diagnostic reasoning and Ford Focus specifics where applicable, while clearly noting data limitations.

CODE MEANING AND SEVERITY

• What P0720 means

  • P0720 is the Generic OBD-II code for “Output Speed Sensor Malfunction.” In Ford applications this is tied to the vehicle speed/shaft speed sensor circuit that feeds the powertrain control module (PCM) or transmission control module (TCM). The sensor signal is used for vehicle speed calculation, shifting logic, and certain drivetrain controls.

• Where it applies on a 2012–2018 Ford Focus

  • Most Focus models use a transmission speed sensor (output speed sensor, OSS) that provides the transmission output shaft speed signal to the PCM/TCM. A fault here can trigger P0720 and illuminate the check engine light, often with other related codes (e.g., P0700 or P0715/P0716 in some vehicles).

• Severity and symptoms

  • Severity: Moderate. Can affect speedometer accuracy, cruise control, and transmission shift behavior. If ignored long enough, can lead to drivability issues or the vehicle entering limp mode.
  • Common symptoms include a faulty or erratic speedometer, cruise control inoperative or intermittent, rough or unusual shifting, and possible transmission warning indicators.

COMMON CAUSES ON FORD FOCUS

• Faulty Output/Vehicle Speed Sensor (OSS or VSS)

  • The sensor itself may be worn, contaminated, or damaged, producing an inconsistent or no signal.

• Faulty wiring or connector between OSS and PCM/TCM

  • Damaged insulation, corroded or loose pins, or water intrusion at the sensor connector can create intermittent or open circuits.

• Damaged or dirty signal tone ring (reluctor ring) on the transmission

  • Missing teeth, nicks, or contamination on the ring can cause irregular pulses to the sensor.

• Ground or power supply problems

  • A bad ground or poor 12V supply to the sensor circuit can cause incorrect readings.

• Transmission or TCM/PCM issues

  • Infrequent but possible: a failing TCM/PCM or corrupted software/calibration can produce or mask OSS signals.

• Other related sensor issues

  • In some Focus configurations, the OSS works in concert with other speed sensors or modules; a failure elsewhere can mimic OSS symptoms or trigger related codes.

SYMPTOMS

• Speedometer behavior

  • Speedometer may read correctly, read low/high, or quit reading entirely.

• Cruise control

  • Cruise control may engage inconsistently or not engage at all.

• Transmission behavior

  • Harsh shifting, delayed upshifts or downshifts, or shifting into a non-optimal gear; potential reluctance to move from a stop if the speed signal is lost.

• MIL (Check Engine Light)

  • The PCM/ECU stores P0720 and may also generate other related codes if the signal is being used for other controls.

• Other indicators

  • In some cases, the ABS system can show warning lights if the vehicle’s speed signal is not being used properly by multiple systems.

DIAGNOSTIC STEPS

Note: When diagnosing P0720, confirm with a scan tool that shows live data for the OSS/VSS signal and the vehicle speed readout. Also verify that no other fault codes mask or contribute to the issue.

• Step 1: Retrieve codes and data

  • Use a capable OBD-II scanner with live data to confirm P0720 and to view the OSS/VSS signal and vehicle speed value vs. actual road speed (if you can determine the actual speed safely).

• Step 2: Check vehicle speed data live vs. actual speed

  • Compare the VSS reading on the scanner to the vehicle’s actual speed (you can wheel-test or use a GPS speed readout). Large discrepancies indicate OSS or wiring issues.

• Step 3: Inspect the OSS sensor and wiring

  • Location: typically on the transmission output shaft area; locate the sensor and its connector.
  • Visual inspection: check for oil leaks, corrosion, damaged plastic, or bent pins. Inspect the wiring harness for chafing, worn insulation, or signs of water ingress.
  • Connector check: unplug and inspect the connector for bent pins, corrosion, or loose fit. Apply dielectric grease to seal and re-seat.

• Step 4: Test the OSS sensor (electrical and signal quality)

  • With the sensor disconnected, measure resistance across the sensor terminals (reference the Ford service data for the expected range; if unknown, compare to a known-good unit or the OEM spec).
  • Reconnect and measure supply and ground: verify 12V supply to the sensor (if applicable) and verify a solid ground at the sensor harness.
  • If accessible, monitor the sensor’s output signal with the scanner as the transmission output speed changes (eg., by cycling the gear selector or manually rotating the output shaft when possible, if the vehicle is safely secured).

• Step 5: Inspect the tone ring and signal integrity

  • Look for damaged or missing teeth on the tone ring (reluctor) near the OSS; any discontinuity can cause missed pulses and P0720-like symptoms.
  • For gearboxes that allow it, rotation with the harness disconnected can help determine if the sensor responds and if the signal appears as a clean pulse train when rotating.

• Step 6: Check for other drivetrain codes

  • P0700 and related transmission codes (P0715, P0716, P0721, P0722, etc.) can accompany P0720. Investigate any additional codes as they point to related components or symptoms.

• Step 7: Consider PCM/TCM health and software

  • If wiring and sensor check out, a software calibration update or, rarely, a faulty PCM/TCM could be involved. In this case, dealership-level reprogramming or module replacement may be indicated.

• Step 8: Decide on replacement or repair path

  • If the OSS sensor tests out of range or shows an obvious fault, replace the sensor.
  • If wiring or connector faults are found, repair or replace the wiring harness and connectors, then re-test.
  • If tone ring damage is found, that may necessitate more extensive transmission service.

• Step 9: Post-repair verification

  • Clear codes, drive normally, and re-scan to verify P0720 is cleared and no new codes appear.
  • Confirm live data shows the OSS signal is now consistent with the vehicle’s speed, and the speedometer/cruise control behave normally.

RELATED CODES

• Transmission and speed-sensing family codes commonly seen with P0720 or in the same symptom cluster include:
  • P0700: Transmission Control System Malfunction (generic)
  • P0715: Input/Turbine Speed Sensor Circuit Malfunction
  • P0716: Input/Turbine Speed Sensor Range/Performance
  • P0721: Output Speed Sensor Performance (if your scanner references this family)
  • P0722: Output Speed Sensor Range/Performance
  • P0723/P0724 (varies by OEM and generation; generally related to sensor performance or circuit)
• Note: Exact code availability can depend on software/scan tool interpretation and model-year specifics.

REPAIR OPTIONS AND COSTS (2025 PRICES)

Prices vary by region, shop, and whether the transmission is manual/automatic or a Powershift setup. The figures below are typical U.S. market ranges as of 2025.

• Output/Vehicle Speed Sensor (VSS/OSS) replacement

  • Parts: typically $40–$120
  • Labor: about $40–$120
  • Total: roughly $100–$240

• Wiring harness or connector repair

  • Parts: few dollars for a connector repair kit or a short harness repair section
  • Labor: 1–2 hours (depending on access and exposure)
  • Total: roughly $150–$500

• Tone ring (reluctor ring) replacement

  • Part: rare; in many cases involves transmission service
  • Labor: 2–5+ hours depending on accessibility
  • Total: typically $400–$1,500+ if the ring is damaged and requires disassembly

• Transmission control module (TCM) repair/reflash

  • Part or reflash: $50–$600 for software updates; full TCM replacement: $600–$1,400 or more (parts + labor)
  • Installation labor: 1–4 hours depending on access and whether replacement is required

• Transmission removal/rebuild (rare for OSS-only fault)

  • Parts: heavy component cost
  • Labor: 6–12+ hours depending on model
  • Total: often $1,000–$4,000+ in extreme cases

• PCM/ECM-related issues (less common for P0720 alone)

  • Repair can involve reprogramming or replacement; costs vary widely

Tips to minimize costs

• Start with the simplest fix: OSS sensor and wiring harness inspection/replacement if needed.
• If the issue persists after sensor replacement and wiring repair, reassess for PCM/TCM or tone-ring problems.
• Confirm whether your Focus uses a Powershift (Ford 6DCT) or traditional automatic, as this can affect service steps and costs.

DIY vs PROFESSIONAL

• DIY-friendly aspects

  • Replacing the OSS sensor is typically a straightforward task for a reasonably capable DIYer, especially if the sensor is accessible with basic tools.
  • Electrical tests (voltage, resistance, continuity) and data-logging for OSS vs. actual speed are well within DIY skill with an adequate scan tool and a multimeter.
  • Step-by-step guidance: locate sensor, unplug harness, unscrew sensor, install new sensor, reattach harness, clear codes, test drive.

• When to go to a professional

  • If the transmission is a Powershift (6DCT) or you suspect a tone-ring issue or internal transmission fault, professional service is strongly advised.
  • If multiple codes appear or if PCM/TCM software updates are required, dealer or transmission specialist intervention is recommended.
  • If you lack the proper diagnostic gear or experience with transmission electricals, avoid deep disassembly.

• Practical approach for DIY

  • Gather: OBD-II scanner with live data, multimeter, basic hand tools, dielectric grease, and the OEM sensor if possible.
  • Work safely: ensure the vehicle is parked on level ground, wheels chocked, and the battery is disconnected when disconnecting major electrical harnesses.
  • Document wiring harness routes before removing any components to ensure proper reassembly.

PREVENTION

• Regular electrical inspection

  • Periodically inspect the OSS/VSS sensor and its harness for oil leaks, dirt, corrosion, or damaged insulation.
  • Look for pin corrosion at the connector; apply dielectric grease to seals after cleaning.

• Protect wiring

  • Route harnesses away from heat sources, moving parts, and water exposure when feasible.
  • Keep clips and grommets in good condition to avoid chafing.

• Maintain software and calibrations

  • Ensure PCM/TCM software is up to date with Ford-recommended calibrations for your specific Focus model and transmission type.

• Routine transmission care

  • Follow Ford’s recommended transmission service intervals for your specific model (oil/change intervals for certain automatics or Powershift units). A well-maintained transmission reduces the likelihood of sensor or related failures.

• Driving habits

  • Gentle acceleration and avoiding severe loads at low speeds can reduce wear on the transmission and sensor systems.

Data limitations and transparency

• The provided data indicates no recorded NHTSA owner complaints or recalls for the 2012–2018 Ford Focus related to P0720. That does not guarantee the absence of real-world issues in all markets or model configurations; rather, it reflects the specific data snippet given.
• P0720 diagnosis and repair should be guided by symptoms, live data, and, when available, Ford service documentation for the exact transmission type (e.g., traditional automatic vs. Powershift 6DCT) in your vehicle.
• Always verify current part prices and labor costs with your local shop, dealer, or parts supplier, as regional variations can be significant in 2025.