P0708

Transmission Range Sensor Circuit High

Severity: High
Driving: Drive only to a garage

The transmission range sensor signal is stuck high - typically shorted to voltage or an open earth. The module has no believable indication of which gear you have selected, so it will refuse to shift normally and will usually hold one gear.

Possible causes

CommonWiring shorted or open between the sensor and the module
CommonCorroded or water-filled connector at the sensor
CommonFailed range sensor
PossibleChafed harness under the vehicle
PossibleLoss of the sensor reference voltage or earth

What you might notice

Transmission stuck in one gear
Gear position display blank or wrong
Engine will not start
Reversing lights not working
Check engine light on

What to check, in order

Unplug the sensor and check whether the high reading persists at the harness. If it does, the fault is in the wiring, not the sensor.
Inspect the connector for corrosion and water. This connector sits low and takes constant road spray.
Check the reference voltage and earth at the sensor before condemning it.
Follow the harness along the transmission looking for chafe damage against the case or a bracket.
Check the fluid level and condition while the vehicle is raised.

Read this code from your own car

Plug an ELM327 adapter into the OBD-II port under the dashboard. Pin16 reads every stored, pending and permanent code, explains each one like this page does — offline, with no account — and shows what the car recorded when the fault was set.

Get Pin16 on Google Play

Where this code sits

B · Body C · Chassis P · Powertrain U · Network and communication