P0722 on GMC
Output Speed Sensor Circuit No Signal
P0722 on GMC vehicles indicates output speed sensor circuit no signal. Au7o has documented this code across 1 GMC model — most commonly on Sierra 3500HD. This code means the transmission control module is receiving no signal at all from the output speed sensor, which measures how fast the transmission's output shaft (and therefore the vehicle) is turning. The computer relies on this sensor to time gear shifts, control the torque converter, and confirm road speed, so when the signal drops out it suspects a broken circuit or dead sensor. You may notice harsh or erratic shifting, the transmission staying in one gear, or an inaccurate or dead speedometer. It is an electrical/no-signal fault rather than just an out-of-range reading. Typical repair costs on GMC range from $500 to $3,500, depending on the specific model and root cause.
Common Causes of P0722
- •Failed output (vehicle) speed sensor
- •Broken, corroded, or loose sensor wiring or connector
- •Open or shorted circuit between sensor and TCM
- •Damaged sensor reluctor/tone ring on the output shaft
- •Metal debris or contamination on the sensor tip
- •Poor ground or power supply to the sensor
- •Faulty transmission control module (less common)
P0722 on GMC by Model
GMC Sierra 3500HD(1 issue)
- Allison 1000 Transmission Control Module and Sensor Failures2008-2019
The Allison 1000 transmission paired with the Duramax diesel in 2008-2015 Sierra 3500HD trucks has a high failure rate for the Transmission Control Module (TCM). A class action suit was filed covering these years. Additional issues include input/output speed sensor failures causing no-forward/reverse conditions, and certain 2012 trucks built with incorrect thrust bearings.
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What does P0722 mean on GMC?▼
P0722 stands for "Output Speed Sensor Circuit No Signal." This code means the transmission control module is receiving no signal at all from the output speed sensor, which measures how fast the transmission's output shaft (and therefore the vehicle) is turning. The computer relies on this sensor to time gear shifts, control the torque converter, and confirm road speed, so when the signal drops out it suspects a broken circuit or dead sensor. You may notice harsh or erratic shifting, the transmission staying in one gear, or an inaccurate or dead speedometer. It is an electrical/no-signal fault rather than just an out-of-range reading. On GMC specifically, this code is documented across 1 model.
What causes P0722 on GMC vehicles?▼
Common causes on GMC: Failed output (vehicle) speed sensor, Broken, corroded, or loose sensor wiring or connector, Open or shorted circuit between sensor and TCM, Damaged sensor reluctor/tone ring on the output shaft, Metal debris or contamination on the sensor tip. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0722 on a GMC?▼
Repair costs on GMC range from $500 to $3,500, depending on the specific model and root cause.
Which GMC models have P0722 documented?▼
Au7o has documented P0722 on 1 GMC model: Sierra 3500HD.