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P0722 = total signal loss, not erratic. Speedometer is usually pegged at zero, cruise control disabled, transmission stuck in 3rd or limp mode. Almost always a wiring open or completely failed sensor - quick to diagnose with a scope or multimeter. Output sensors on Amazon ↑
🗺️ Where Is the Problem?
Blueprint view - P0722 fault localized to the transmission control system / solenoid body
These are statistical causes across ALL vehicles - your exact car may rank differently
For example, on a Honda 4-cyl the downstream O2 sensor causes P0722 64% of the time, but on a GM 5.3L V8 the catalytic converter is the cause 71% of the time. Get a probability ranking built specifically for your year, make, model, and mileage.
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🎯 Top Causes & Probability
60%
#1 - Most Likely
Open / Failed Output Speed Sensor
The OSS has died completely - either internal coil open or magnet broken. With no signal at all, cruise control disables and the speedometer reads zero. Replace the sensor and verify the new one with a scope before clearing codes.
🔩 Part
$30–$130
👨🔧 Labor
$100–$280
⚡ DIY Difficulty
Medium
30%
#2 - Check First
Open Wire / Bad Connector
A complete signal loss often means the wire is broken, not just chafed. Common at the connector pigtail near the trans case where heat fatigues the insulation. Pin-out inspection and continuity test are mandatory.
🔩 Part
$20–$120
👨🔧 Labor
$120–$320
⚡ DIY Difficulty
Medium
10%
#3 - Less Common
Internal Reluctor Failure
The toothed reluctor wheel has shattered or sheared from the output shaft. Trans must be opened. Often accompanied by other internal damage.
🔩 Part
$100–$400
👨🔧 Labor
$1,500–$3,000
⚡ DIY Difficulty
Hard
🚗 Most Affected Vehicles
🔧 Step-by-Step Diagnosis
- Verify speedometer and cruise behavior - Both should be inoperative with P0722. If speedometer works normally, suspect ABS-side speed sensor instead and recheck which sensor the code refers to.
- Continuity test the OSS circuit - With key off, ohm out the sensor pins at the TCM connector. Any open circuit reading confirms a broken wire or dead sensor coil.
📍 Find a Trusted Shop Near You
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Tips for Choosing a Shop
- Ask if they charge a diagnostic fee and whether it applies toward the repair
- Request a written estimate before approving any work
- Ask specifically about the part brand - OEM vs. aftermarket matters for this code
- Check Google reviews for recent mentions of the specific repair you need