P0722 Code: Output Speed Sensor Circuit No Signal

The P0722 diagnostic trouble code (DTC) indicates a critical problem with your vehicle’s output speed sensor circuit. Specifically, the powertrain control module (PCM) is not receiving a signal from the output speed sensor (OSS). This sensor is essential for monitoring transmission output shaft speed, which helps the PCM determine proper shift points, torque converter clutch operation, and overall transmission performance.

When the P0722 code is stored, you may experience one or more of the following symptoms, ranging from mild to severe:

The P0722 code can be triggered by several issues related to the output speed sensor circuit. Understanding these causes can help with accurate diagnosis:

Follow these detailed steps to properly diagnose the P0722 code. Always prioritize safety and consult your vehicle’s service manual for specific instructions.

1. Initial Code Scan & Documentation

   Use an OBD-II scanner to confirm the P0722 code and check for any additional codes that might provide more context. Document all codes, freeze frame data, and monitor live data if possible.

   P0722 – Output Speed Sensor Circuit No Signal
   Freeze Frame: RPM 2450, VSS 0 mph, TPS 45%
2. Comprehensive Visual Inspection

   Thoroughly inspect the output speed sensor, its wiring harness, and connector for obvious damage, corrosion, or loose connections. Check the sensor mounting and tone wheel if accessible. Look for:

   • Damaged or frayed wires
   • Corroded connectors
   • Loose sensor mounting
   • Evidence of fluid leaks
   • Physical damage to the sensor or tone wheel
3. Sensor Resistance Testing

   Using a digital multimeter, measure the resistance of the output speed sensor. Compare with manufacturer specifications (typically between 200-1500 ohms).

   Expected: 200-1500Ω (consult service manual)
   Measured: [Your reading] Ω
4. Voltage Supply Testing

   With the ignition on (engine off), check for reference voltage at the sensor connector (usually 5V or 12V). Also verify proper ground connection.

   Reference Voltage: ~5V or 12V (consult service manual)
   Ground Circuit: Should show continuity to ground
5. AC Voltage Signal Testing

   With the engine running (if safe), use an AC voltmeter to check for an AC voltage signal from the sensor while rotating the output shaft. The voltage should fluctuate as speed changes.

   AC Voltage: Should increase with wheel speed
   Pattern: Clean sine or square wave (use oscilloscope if available)
6. Comprehensive Wiring Inspection

   Check for continuity in the wiring between the sensor and PCM. Also check for shorts to ground or power in the signal circuit. Perform voltage drop tests on power and ground circuits.

7. Advanced Scope Testing

   If available, use an oscilloscope to view the sensor waveform. A healthy sensor will produce a clean sine or square wave pattern that increases in frequency with speed.

8. Tone Wheel Inspection

   If accessible, inspect the tone wheel (reluctor ring) for damage, missing teeth, or excessive runout that could affect sensor reading.

Required Tools for Diagnosis

The cost to repair a P0722 code varies significantly depending on the specific cause, your vehicle make/model, and labor rates in your area:

Common Repair Scenarios

Time Estimates

Sensor Replacement: 1-2 hours

Wiring Repair: 1-3 hours

Transmission Work: 4-8+ hours

Vehicle Models Commonly Affected

P0722 can occur in any vehicle with an electronic transmission, but it’s more common in certain models:

• Ford: F-150, Explorer, Focus, Mustang
• GM: Silverado, Tahoe, Malibu, Impala
• Chrysler: Jeep Grand Cherokee, Dodge Ram, Chrysler 300
• Honda: Accord, Civic, Odyssey
• Toyota: Camry, Corolla, Tacoma

Prevention Tips

Safety Concerns

Professional vs DIY Repair