OBD-II trouble code
P0708: Transmission Range Sensor "A" Circuit High
SAE J2012 circuit high: a measured value on the range-sensor circuit is above the normal span. On the Ford PWM table for the 6R80, 6R140, 10R60, and 10R80 that is a duty cycle over 92%. The same Ford book maps an open on a digital range sensor to this code as well. Hyundai/Kia TSB 19-AT-024H uses it for a short or multiple inputs on the 6-speeds it lists.
Quick facts
- System
- Powertrain
- Category
- Transmission / Shift Control
- Severity
- Medium severity
- Drivable
- Usually safe to drive short-term
- Repair cost range
- $250 – $900 (transmission position sensor replacement)
- DIY difficulty
- Intermediate DIY
Browse every code in P0700–P0799, or start from the full code library.
What does P0708 mean?
Circuit high is a measurement above the monitor's normal span. Worn contacts, an unplugged connector, a short to power, and an illegal combination of range bits have all been published under this number, on different vehicles.
In the 2024–2025 Ford PCED, the table for the 6R80, 6R140, 10R60, and 10R80 sets P0708 when duty cycle is over 92%. The digital-range-sensor line in that book maps an open on a digital sensor to the same code. One Ford number covers two sensors. Fusion 6F35 Pinpoint Test J lists the P0708 trigger as a range-sensor circuit open. GM's 14 OBDG04 TCM Summary Tables set P0708 when POS1 or POS2 is over 4.84 V for 200 ms. That file does not name a vehicle. The 2009 Allison file titles the code Transmission Range Sensor High Input and then describes an illegal electrical state for at least 1 second, or long-term parity errors on the 4-bit range input. That is not a high-voltage limit and it is not a mileage wear story.
Hyundai/Kia TSB 19-AT-024H (November 2019) defines P0708 as a range-switch short or multiple inputs on the 6-speed vehicles it lists, and it defines P0707 as the open. A page that swaps those two will fail the diagnosis on those cars. There is no published cycle count that says this code arrives only at high mileage.
Common causes
- A connector left unplugged, or terminals that do not latch, on a calibration that stores an open as P0708
- A sense circuit shorted to power, where the chart's high limit is a voltage or a duty cycle
- A digital range sensor with an open circuit, on the Ford digital-sensor line that maps that open to P0708
- Multiple range inputs at once, which is the P0708 definition in Hyundai/Kia TSB 19-AT-024H for the 6-speeds it lists
- An illegal range-bit state or a parity error, as described in the 2009 Allison certification file for the vehicles that file covers
- A failed sensor, after the connector and the harness match the chart
Symptoms
- Check engine light on
- Gear display stuck, blank, or showing two ranges
- No-crank, or cranking outside Park and Neutral
- Failsafe gear on the calibrations that command one
- Reverse lamps that do not match the lever
- A range PID that stays high while the lever moves
Diagnostic steps
- 1.Confirm which sensor this transmission uses, and which definition the chart gives P0708. A PWM duty cycle over 92%, a digital open, a 14 OBDG04 signal over 4.84 V, an Allison parity fault, and a Hyundai short-or-multiple-input are not one measurement.
- 2.Parking brake on, wheels chocked. Compare each detent with the range PID. A passenger reads the tool, or you record the trace. Look for two ranges indicated together, which is the condition TSB 19-AT-024H names for P0708 on its 6-speed list.
- 3.Ignition off. Inspect the connector for a loose latch, water, and pushed-out terminals. An unplugged digital sensor is one of the opens the Ford book maps to this code. Reseat and recheck the PID before replacing the sensor.
- 4.Run the pinpoint. Fusion 6F35 Pinpoint Test J treats P0708 as an open and checks the circuits with the limits in that test. Do not transfer those limits to another unit. On a PWM sensor, read frequency and duty cycle the way that Ford table describes, rather than ohming pins to ground.
- 5.On the 6-speed vehicles in TSB 19-AT-024H, follow that bulletin's short-or-multiple-input flow for P0708. The bulletin also lists a 4th-gear failsafe, a blank gear display, and an intermittent no-crank in Park or Neutral among the symptoms it covers.
- 6.If the switch is under the pan, prove the external circuits at the case connector first. Pan-off work needs a lift or stands and fluid that has cooled.
- 7.After the repair, confirm one range indication per detent and cranking only in the ranges the chart allows.
Repair cost
$250 – $900 (transmission position sensor replacement)
Replacement of the position sensor is the job these sites price. RepairPal, updated 3 September 2026, averages $394–$511 parts and labor. YourMechanic, retrieved 25 October 2026, lists $269 on a 2013 Ford Fusion, $306 on a 2012 Jeep Grand Cherokee, $501 on a 2014 Ford F-350, and $852 on a 2012 Audi S5. The $250–$900 pair rounds that spread. It does not price a terminal repair, and YourMechanic's side-of-case description does not price a valve-body switch. Nothing in the cited monitors makes replacement the automatic outcome.
Estimate your repair
Run the numbers for your vehicle
Open the Repair Cost Estimator with transmission range sensor / neutral safety switch replacement preselected. Adjust labor rate and vehicle category to fit your situation.
DIY vs shop
This is an intermediate DIY job. It usually involves diagnostic steps, specialty parts, and some careful work in tight spaces. If you have the tools and a service manual or trustworthy video for your specific vehicle, it is achievable in a weekend. Otherwise, a competent independent shop will be faster.