P0722 Code: Output Speed Sensor Circuit No Signal

What the P0722 code means

The output speed sensor measures the speed of the shaft that goes to the wheels. On many vehicles it is also the source for the speedometer and the cruise control.

The sensor generates pulses whose frequency depends on the speed or the quantity being measured. Without pulses, the computer cannot calculate the quantity and uses a substitute value. That is what sets the P0722 code.

Without this signal the transmission goes into limp mode and the speedometer can drop to zero. Also check for ABS codes, because some vehicles combine both signals. See the sensor guide to learn how to test it.

First check that the sensor is getting power and ground. Then, with the component moving, measure the signal with an oscilloscope or a multimeter on the frequency scale. If there are no pulses with correct power, the sensor is bad. If there are pulses at the sensor but not at the computer, the wire is cut.

P0722 code symptoms

• Check engine light on.
• Limp mode and a wrong speedometer.
• Speedometer dead or erratic.
• The transmission does not shift.

Likely causes of the P0722 code

1. Sensor without power, from a fuse or the reference.
2. Signal wire cut between the sensor and the computer.
3. Failed sensor that does not generate pulses.
4. Damaged or dirty reading element, with broken or dirty teeth.

How to diagnose the P0722 code step by step

1. Read the sensor value on the scan tool and compare it with what is expected.
2. Inspect the connector for corrosion, water and loose pins.
3. Check power and ground with the key on: a correct reference and less than 0.1 volt drop on the ground.
4. Measure the signal with the connector plugged in and see whether it changes with the condition.
5. Do a wiggle test of the wiring with the scan tool in graph mode.
6. Check the continuity of each wire back to the computer (under 1 ohm).
7. Compare it with the ABS wheel speeds on the scan tool.

How to fix the P0722 code

• Repair the connector or the wiring.
• Replace the sensor if the tests confirm it is bad.
• Correct the real condition if there is one.
• Clear the P0722 code and verify with a road test.

Technical reference data

• Inductive or Hall effect sensor; the frequency is proportional to speed.
• Reference values only: check the manufacturer data for your vehicle.

Brand-specific notes

The source reports this code as frequent on pickup trucks with an automatic transmission.

P0722 on Ford

Frequent on Ford pickups with an automatic transmission.

P0722 on GM

Frequent on GM pickups with an automatic transmission.

Frequently asked questions about P0722