P0706
PowertrainTransmission Range Sensor Circuit Range/Performance
Usually this is a smaller job than the fear it puts in you, because the range sensor (sometimes called the inhibitor switch or PRNDL switch) is a bolt-on part rather than something buried inside the gearbox. The PCM works out which gear you've selected from this sensor, and when the voltage it sees doesn't match a valid position, or jumps about as you move the lever, P0706 lands. The trouble is the symptoms feel dramatic: wrong gear on the dash, harsh shifts, limp mode. Most of the time the fix is the sensor or its connector, not the transmission itself.
ⓘ Information only. This page provides general educational information about fault code P0706. We do not assess the urgency or safety implications of any specific fault. That requires in-person diagnosis by a qualified mechanic. Full terms.
Recommended next steps
Whether a fault is urgent, drivable, or routine depends entirely on the cause on a specific vehicle, and that can only be determined by a qualified mechanic with diagnostic equipment. If a warning light is illuminated, the most reliable next step is professional diagnosis.
What does P0706 mean?
P0706 is a Powertrain (engine, transmission, fuel system) fault code. It indicates: Transmission Range Sensor Circuit Range/Performance.
This is a standardised OBD-II code. The technical definition is the same regardless of the make or model of vehicle, although specific causes and symptoms can vary between vehicles.
Symptoms commonly associated with this code
Symptoms that drivers often report alongside this code. Not all may apply to every case:
- • Engine warning light on, often with the gear indicator on the dash showing the wrong letter or flashing
- • Harsh or delayed engagement when you shift from Park into Drive or Reverse
- • Gearbox dropping into limp mode, leaving you stuck in one or two gears with no kickdown
- • Reverse lights not coming on when you select R
- • Engine cranking and starting in a gear other than Park or Neutral, which is a genuine safety concern
- • Shifter feeling notchy or stuck when moving the selector
Possible causes
Causes commonly associated with P0706, listed in approximate order of typical investigation. The actual cause on a specific vehicle can only be confirmed by professional diagnosis.
- 1. The range sensor itself sending erratic or out-of-range voltage, the most common cause and usually the cheapest to put right
- 2. Corroded, chafed or loose wiring between the sensor and the control module, very common on older cars where the harness runs near the bellhousing and cops the heat
- 3. Dirty or spread connector terminals at the sensor plug, giving an intermittent signal that comes and goes
- 4. Shift linkage out of adjustment so the sensor reads the wrong position relative to where the lever actually is
- 5. Old or contaminated ATF interfering with sensor operation, more relevant on gearboxes with an integrated switch sitting in the fluid
- 6. Internal valve body faults messing with the hydraulic side, less common but worth ruling out
- 7. A failing transmission control module misreading good data, rare, check everything else first
How mechanics typically diagnose
A typical diagnostic sequence used by mechanics, provided here for educational reference only. Diagnostic work should be performed by a qualified mechanic with the appropriate tools and training.
- 1. Watch live range sensor data on a scanner while you walk the lever through P, R, N, D and back. A healthy sensor jumps cleanly to a distinct value for each position. If a position reads blank, sticks, or flickers, you've found your fault
- 2. Read all stored codes and the freeze frame so you know what the car was doing when it logged. Pair this with any other gearbox codes that turned up
- 3. Inspect the sensor connector and the harness around it for corrosion, melted insulation or a plug that isn't fully seated. Wiggle-test it with live data running
- 4. Check whether the engine will crank in Drive or Reverse. If it does, the sensor or linkage is telling the car the wrong gear and that needs sorting before anything else
- 5. Confirm the shift linkage is adjusted properly so the lever position matches the sensor position. A bit out and the sensor straddles two ranges
- 6. Back-probe the sensor circuit with a multimeter for continuity and resistance against the spec if voltage looked off and the wiring looked suspect
Common questions about P0706
What can go wrong if I just keep driving it like this? +
The headline risk is the engine starting while the car thinks it's in the wrong gear. If the sensor reports Neutral when you're actually in Drive, the car can lurch forward the moment it fires up, which is no joke on a sloped driveway or in a tight car park. On top of that the gearbox will often drop into limp mode, so you're stuck with one or two gears and no proper acceleration for joining a motorway or overtaking. It's drivable in a get-it-home sense, but not something to live with for weeks.
How quickly do I need to get this sorted? +
Treat it as days, not months. Once a car starts confusing its gear positions you're rolling the dice on starting in gear and on getting stranded in limp mode at the worst moment. It won't usually leave you on the hard shoulder immediately, but the failure mode is unpredictable. Get the sensor and wiring looked at before your next long run rather than after.
Is it the sensor that's failed, or is it the wiring and plug? +
Could be either, and the only way to know is the live data wiggle-test rather than guessing. If the signal drops out cleanly when you move the harness or tap the connector, your money's on the wiring or a corroded plug, which is cheap to fix. If the values are wrong with the loom dead still, the sensor itself is the likely culprit. Plenty of P0706s get cured by cleaning and reseating the connector before anyone spends a penny on parts, so check that first.
Information only, not professional advice
The information on this page is provided for general guidance and educational purposes only. It is not a substitute for diagnosis or repair advice from a qualified mechanic. Always verify any fault before paying for repairs. carfaultcodes.co.uk accepts no liability for decisions made based on this information. Full terms →