What are the common causes of the P0722 code on a Gmc?

cause_speed_sensor_out, cause_wiring_damage, cause_connector_corrosion, cause_transmission_fluid

How much does it cost to fix the P0722 code?

The estimated repair cost for the P0722 code is $150 - $600. This includes parts and labor.

P0722Gmc YukonAnnées: 1996 - 2026

Output Speed Sensor Circuit No Signal

Vérifié par un technicien certifié ASE

Est-il sûr de conduire ?Driving with P0722 is generally not recommended for extended periods. The transmission relies heavily on the output speed sensor signal for proper shift scheduling, torque converter lock-up, and potentially speedometer operation. Without this signal, the transmission may exhibit harsh or erratic shifting, remain stuck in a single gear (limp mode), or fail to shift at all. This can lead to unpredictable vehicle behavior, potential loss of power, and an increased risk of an accident, especially at higher speeds or in heavy traffic. Continued driving with this condition can also cause accelerated wear or damage to internal transmission components due to incorrect operation.

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Qu'est-ce que cela signifie ?

Code P0722 indicates a problem with the transmission output speed sensor.

Avertissement : Ce code de diagnostic fait partie du système OBD2 standard et peut s'appliquer aux modèles Gmc Yukon fabriqués de 1996 à 2026. Cependant, veuillez noter que la présence de ce code dépend de la configuration exacte du moteur, des options et de l'année de production.

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Causes courantes

Capteur de vitesse de sortie défectueux

Faisceau de câblage endommagé ou cassé

Connecteur électrique corrodé ou desserré

Liquide de transmission bas, sale ou brûlé

Symptômes à surveiller

Le voyant moteur est allumé
Lecture erratique du compteur de vitesse
Changement de vitesse brutal
La transmission glisse entre les vitesses

Comment Diagnostiquer

**1. Initial Scan, Visual Inspection, and Freeze Frame Data Analysis:** Connect a professional-grade scan tool to the vehicle's OBD-II port. Confirm the presence of P0722 and check for any other related codes, such as P0720, P0721, P0723 (other OSS circuit issues), or P0500 series codes (Vehicle Speed Sensor issues), as these can provide additional context. Record any freeze frame data, which captures engine parameters at the moment the code was set. Visually locate the Output Speed Sensor (OSS) on the transmission (typically on the tail shaft housing or output shaft area). Inspect the sensor and its wiring harness for any obvious signs of physical damage, frayed wires, corrosion, loose connections, or rodent damage. Pay close attention to the connector itself for bent pins or a compromised seal.

**2. Circuit Integrity and Power/Ground Verification:** With the ignition off, disconnect the OSS electrical connector. Using a Digital Multimeter (DMM), perform continuity checks on the sensor's circuit wiring from the sensor connector back to the Powertrain Control Module (PCM) or Transmission Control Module (TCM) connector (refer to the vehicle's specific wiring diagram for pinouts). Check for opens, shorts to ground, or shorts to voltage on all wires in the circuit. Next, with the ignition on (engine off), verify proper power and ground supply at the OSS connector. Most OSS sensors are a 3-wire design: power (typically 5V or 12V), ground, and signal. Ensure the specified voltage is present and the ground circuit has low resistance.

**3. Output Speed Sensor Functionality Test:** This is a critical step. Safely lift the drive wheels off the ground using appropriate jack stands. With the sensor connected, start the engine and place the transmission in drive (or a forward gear) to allow the wheels to spin slowly. Using a DMM set to AC voltage, back-probe the signal wire at the OSS connector. You should observe an AC voltage signal that increases in frequency and amplitude as the wheel speed increases. If no signal is present, or it is erratic/intermittent, the sensor is likely faulty. For a more definitive test, an oscilloscope can be used to observe the waveform, looking for a clean, consistent square wave signal that corresponds to the output shaft rotation.

**4. PCM/TCM Input Verification (If Sensor Signal is Good):** If the OSS is producing a good, consistent signal and the wiring integrity from the sensor to the control module has been confirmed, the next step is to verify that the PCM/TCM is actually receiving this signal. Back-probe the signal wire at the PCM/TCM connector while the wheels are spinning. If the signal is present at the sensor and along the wiring, but not at the control module's input pin, there might be an internal wiring issue within the harness or a problem with the control module's pin connection itself. If the signal is present at the module's input, but the P0722 code persists and symptoms remain, the PCM/TCM could be faulty, though this is a less common failure point than the sensor or wiring.

**5. Internal Transmission Tone Ring Inspection (Advanced):** If the sensor, wiring, and PCM/TCM input are all verified to be functioning correctly, the problem may lie within the transmission itself. The output speed sensor relies on a tone ring (or reluctor wheel) on the transmission's output shaft to generate its signal. Damage to this tone ring (e.g., broken teeth, excessive wear, or interference from debris) would prevent the sensor from generating a proper signal, even if the sensor itself is good. This typically requires transmission removal and partial disassembly for inspection and repair, which is a more extensive and costly procedure.

Solutions Courantes

**Replace the Output Speed Sensor (OSS):** This is the most common solution. If the sensor fails the functionality test or shows signs of physical damage, replacing it with a quality OEM or reputable aftermarket part will often resolve the P0722 code.

**Repair or Replace Damaged Wiring/Connector:** Inspect and repair any frayed, corroded, or broken wires in the OSS circuit. If the electrical connector itself is compromised (e.g., bent pins, excessive corrosion, or a poor seal), replace the connector pigtail to ensure a solid connection.

**Clean Connector Pins:** Sometimes, simply disconnecting the OSS connector, thoroughly cleaning the pins with electrical contact cleaner, and then reconnecting it can restore proper signal transmission, especially in vehicles exposed to moisture, dirt, or road salt.

**Address Internal Transmission Tone Ring Damage:** In rare cases, if the sensor and wiring are confirmed good, the issue lies with a damaged or obstructed tone ring on the transmission's output shaft. This requires transmission removal and partial disassembly to repair or replace the tone ring, which is a more involved and costly repair.

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Estimation de réparation

$150 - $600

Pièces$30 - $150 (Output Speed Sensor); $15 - $50 (Connector Pigtail, if needed)

Main-d'œuvre$75 - $300 (Sensor replacement and basic diagnosis); $150 - $600 (Extensive wiring diagnosis/repair); $800 - $2000+ (If internal transmission repair for tone ring is required)

Difficulté de réparation (DIY)

Difficile

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Output Speed Sensor Circuit No Signal

Vérifié par un technicien certifié ASE

Qu'est-ce que cela signifie ?

Code P0722 indicates a problem with the transmission output speed sensor.

Comment Diagnostiquer

Solutions Courantes

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Symptômes à surveiller

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