P0720 on a 2012 Jeep Wrangler
Transmission Output Speed Sensor Malfunction
P0720 on a 2012 Jeep Wrangler indicates transmission output speed sensor malfunction. It usually stays drivable short-term but should be diagnosed promptly. The most common cause is failed output shaft speed sensor element (typically $150–$500). Confirm the root cause before replacing parts.
What does P0720 mean on a 2012 Jeep Wrangler?
P0720 is set when the transmission control module does not receive a valid signal from the output shaft speed sensor. The TCM uses this signal to compare actual transmission output to expected output for the selected gear and engine RPM — if the signal is missing or implausible, gear ratio calculations fail and the TCM cannot shift correctly. The vehicle typically drops into limp mode (stuck in a default gear, often 3rd or 4th) until the signal is restored.
This guide covers P0720 across the 2010-2014 Jeep Wrangler generation — the symptoms, causes, and diagnostic steps below apply to every model year from 2010 through 2014.
Is it safe to drive a 2012 Jeep Wrangler with P0720?
In most cases a 2012 Jeep Wrangler stays drivable for short trips with P0720 active, but diagnose and repair it promptly. This is a high-severity code — ignoring it can lead to further damage or a failed emissions test.
What are the symptoms of P0720 on a 2012 Jeep Wrangler?
- Check Engine Light is illuminated
- Speedometer reads zero or fluctuates erratically
- Transmission locked into a single gear (limp mode)
- Hard, harsh, or no shifts
- Cruise control inoperative
- Vehicle may shudder or hesitate at the moment of shift
- Often paired with P0700 (transmission control malfunction)
What causes P0720 on a 2012 Jeep Wrangler?
| Cause | Likelihood | Estimated repair (USD) |
|---|---|---|
| Failed output shaft speed sensor element | Most common | $150–$500 |
| Damaged sensor connector or harness | Common | $80–$350 |
| Metal debris on the sensor tip (from internal transmission wear) Cleaning the sensor face is a free first attempt. | Common | $100–$400 |
| Damaged tone ring or reluctor wheel inside the transmission | Occasional | $1,500–$4,500 |
| Transmission fluid contamination preventing the sensor from reading | Occasional | $200–$700 |
| Wiring fault between the sensor and the TCM | Occasional | $100–$500 |
| Failed TCM signal input (rare) | Rare | $500–$1,500 |
How to diagnose this on a 2012 Jeep Wrangler
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Locate the output speed sensor on this transmission
The output shaft speed sensor is typically a two-wire sensor threaded into the rear of the transmission case (RWD vehicles) or the side of the transaxle (FWD vehicles). Some vehicles have it on the transfer case for 4WD. Confirm location in the service manual.
Tools: Vehicle-specific service information
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Check connector and visible wiring
Sensor connectors near the transmission case are exposed to heat, road debris, and sometimes fluid leaks. Unplug and inspect for corrosion, transmission fluid migration up the harness, or visible damage. Clean and re-seat.
Tools: Connector unlock tool, Electrical contact cleaner
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Measure sensor resistance
Most output speed sensors are magnetic or Hall-effect with a typical resistance of 200–1500 Ω. Compare to the service manual. Infinite resistance means an open sensor; near zero means shorted. Either way, replace.
Tools: Multimeter, Service spec sheet
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Verify signal output during rotation
On a lift with the rear wheels free to rotate, spin a rear wheel slowly by hand while watching the output speed PID. The reading should change in proportion to wheel rotation. No response confirms a dead sensor or damaged tone ring.
Tools: Vehicle lift, Scan tool with output speed PID
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Inspect sensor tip for debris
Remove the sensor and look at the magnetic tip. Steel slivers stuck to the magnet are normal — large chunks or clutch material is a warning sign that the transmission is shedding material. Clean the tip and reinstall as a first attempt; consider transmission fluid analysis if heavy debris was present.
Tools: Socket, Magnet pick or wire brush
NHTSA complaints & recalls for the 2012 Jeep Wrangler
Owner-reported safety complaints and official recalls filed with the U.S. National Highway Traffic Safety Administration for the 2012 Jeep Wrangler. Use these to gauge how common a problem is on your specific vehicle before you start chasing Jeep Wrangler diagnostics.
- POWER TRAIN 282
- ENGINE 171
- STEERING 204
- ELECTRICAL SYSTEM 147
- AIR BAGS 128
10 active recalls
- AIR BAGS:FRONTAL:PASSENGER SIDE:INFLATOR MODULE Jan 2019
Chrysler (FCA US LLC) is recalling certain 2010 Dodge Ram 3500, Ram 4500/5500, 2010-2011 Dodge Dakota, 2010-2014 Dodge Challenger, 2010-2015 Dodge Challenger, Chrysler 300, and 2010-2016 Jeep Wrangler vehicles. Upon deployment of the driver's frontal air bag, excessive internal…
NHTSA campaign 19V018000 - SEAT BELTS:FRONT:ANCHORAGE Sep 2019
Chrysler (FCA US LLC) is recalling certain 2011-2018 Jeep Wrangler right hand drive vehicles. The driver's seat belt buckle mounting strap may fracture and separate from the seat frame.…
NHTSA campaign 19V680000 - AIR BAGS:FRONTAL:PASSENGER SIDE:INFLATOR MODULE Jan 2018
Chrysler (FCA US LLC) is recalling certain 2009-2013 Jeep Wrangler, Chrysler 300, Dodge Challenger and Dodge Charger vehicles, and 2009-2011 Dodge Dakota vehicles sold, or ever registered, in the states of Alabama, California, Florida, Georgia, Hawaii, Louisiana, Mississippi, Sou…
NHTSA campaign 18V021000 - AIR BAGS:FRONTAL:PASSENGER SIDE:INFLATOR MODULE May 2016
Chrysler (FCA US LLC) expanded the affected population to include 73,712 2005-2009 RAM 2500 trucks produced at the St. Louis North Assembly Plant. With this change, Chrysler is recalling certain model year 2004-2008 RAM 1500, 2005-2009 RAM 2500, 2006-2009 RAM 3500, 2007-2010 RAM…
NHTSA campaign 16V352000
How do I fix P0720 on a 2012 Jeep Wrangler?
- Clean debris off the output speed sensor tip
- Replace the output shaft speed sensor with an OEM part
- Repair sensor connector or harness damage
- Service transmission fluid (drop pan, replace filter and gasket)
- Internal transmission repair if tone ring or shaft damage is confirmed
About the 2010-2014 Jeep Wrangler
The 2010-2014 Jeep Wrangler was commonly sold with the following powertrains: 3.6L Pentastar V6, 2.0L Turbo I4, 3.0L EcoDiesel V6. Common trims include Sport, Sport S, Sahara, Rubicon.
Why P0720 puts the transmission into limp mode
The TCM continuously compares output shaft speed to engine RPM and selected gear to verify it is actually getting the gear ratio it commanded. Without a valid output speed signal:
- Ratio verification fails (sets P0731-P0734 in some cases)
- Shift point timing breaks (cannot tell vehicle speed for upshifts)
- Torque converter lockup logic fails (depends on accurate speed)
Limp mode is a protection — the TCM picks a safe default gear and holds it until the signal returns. Drive a short distance to a shop; do not attempt long trips in limp mode.
P0720 with metal on the sensor tip
A small amount of metallic dust on the magnetic sensor tip is normal — it’s the natural wear of bearings and gears over the life of the transmission. Large flakes or clutch material is not normal and indicates internal damage that will eventually cause shifting problems beyond the sensor. If you find heavy debris, do a fluid service and inspect the pan magnet too — together they tell the story of what’s happening inside.
P0720 vs P0500 (Vehicle Speed Sensor)
These can look similar but come from different sources:
- P0500 — vehicle speed signal missing (often the ABS wheel speed sensor on modern vehicles)
- P0720 — transmission output shaft speed signal missing specifically from the transmission’s own sensor
On vehicles where the TCM derives “vehicle speed” from the output shaft sensor, both codes can set together from a single sensor failure.
P0720 on a 2012 Jeep Wrangler: frequently asked questions
What does diagnostic trouble code P0720 mean on a 2012 Jeep Wrangler?
P0720 is set when the transmission control module does not receive a valid signal from the output shaft speed sensor. The TCM uses this signal to compare actual transmission output to expected output for the selected gear and engine RPM — if the signal is missing or implausible, gear ratio calculations fail and the TCM cannot shift correctly. The vehicle typically drops into limp mode (stuck in a default gear, often 3rd or 4th) until the signal is restored.
What are the symptoms of P0720 on a 2012 Jeep Wrangler?
Check Engine Light is illuminated. Speedometer reads zero or fluctuates erratically. Transmission locked into a single gear (limp mode). Hard, harsh, or no shifts. Cruise control inoperative. Vehicle may shudder or hesitate at the moment of shift. Often paired with P0700 (transmission control malfunction)
What causes P0720 on a 2012 Jeep Wrangler?
Failed output shaft speed sensor element (most-common). Damaged sensor connector or harness (common). Metal debris on the sensor tip (from internal transmission wear) (common). Damaged tone ring or reluctor wheel inside the transmission (occasional). Transmission fluid contamination preventing the sensor from reading (occasional). Wiring fault between the sensor and the TCM (occasional). Failed TCM signal input (rare) (rare)
Is it safe to drive a 2012 Jeep Wrangler with P0720?
In most cases a 2012 Jeep Wrangler stays drivable for short trips with P0720 active, but it should be diagnosed and repaired promptly — this is a high-severity code. Ignoring it can lead to further damage or a failed emissions test.