What Does P0722 Mean?
The output speed sensor circuit is not producing any signal. The TCM expects to see a speed signal when the vehicle is moving but receives nothing. This is a more severe condition than P0721 (range/performance) because there is a complete loss of signal. The driver will likely notice the transmission stuck in one gear (limp mode), an inoperative speedometer, and possibly cruise control and ABS issues.
Safety Warning
The transmission will likely be in limp mode (one gear only), the speedometer may not function, and ABS/traction control may be disabled. Driving is possible at low speeds but dangerous at highway speeds without a speedometer and with limited transmission function. Repair immediately.
Common Causes
35%
Failed output speed sensor (open coil or cracked element)
25%
Open circuit in the wiring between the sensor and TCM
20%
Disconnected or severely corroded sensor connector
10%
Completely missing or shattered reluctor ring
10%
TCM not receiving signal due to internal fault or connector damage
Diagnostic Steps
1
Verify the OSS PID reads 0 RPM in live data while driving. If it reads 0 at all speeds, the signal is completely absent.
2
Check the OSS connector — ensure it is connected, locked, and free of corrosion. A disconnected sensor is a common cause of a no-signal code.
3
Measure the sensor resistance. Should be within the manufacturer's specified range (typically 300-1,200 ohms). An open reading (OL) confirms a failed sensor.
4
If the sensor resistance is correct, measure AC voltage output at the sensor connector while spinning the output shaft (raise vehicle on a lift, put in gear at low speed). Should produce an AC signal proportional to speed.
5
Check wiring continuity from the sensor connector to the TCM. An open circuit in either the signal or ground wire prevents signal transmission.
6
Inspect the sensor mounting area for excessive play or damage that could indicate reluctor ring failure.
Estimated Repair Cost
$100 - $500
Parts + labor, varies by vehicle and location
The output speed sensor circuit is not producing any signal. The TCM expects to see a speed signal when the vehicle is moving but receives nothing. This is a more severe condition than P0721 (range/performance) because there is a complete loss of signal. The driver will likely notice the transmissio...
The most common cause of P0722 (Output Speed Sensor Circuit No Signal) is: Failed output speed sensor (open coil or cracked element)
Typical repair costs for P0722 range from $100 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The transmission will likely be in limp mode (one gear only), the speedometer may not function, and ABS/traction control may be disabled. Driving is possible at low speeds but dangerous at highway speeds without a speedometer and with limited transmission function. Repair immediately.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0722 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission
Difficulty
Type
Generic (SAE)
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