Q: P0705 - 2007 Scion tC

asked by on October 13, 2016

Since i installed my remote start,engine light on after couple of hours.the code was P0705.the mechanic already fixed the problem by changing the sensor.the engine light came on again after 8 hrs.whats gonna be the problem?thanks

My car has 156000 miles.
My car has an automatic transmission.

Hello and thanks for contacting YourMechanic. The code P0705 means the transmission range sensor circuit has a fault. This is usually caused by the sensor on the transmission failing. After installing the remote start switch, if you did not hook it into the transmission range selector, then the computer will not know when to start the vehicle. If you hooked up the remove start switch correctly, then the code is saying the there is a communication error between the transmission range sensor and the computer. Check the harness to the sensor for any debris or corrosion. I recommend replacing the transmission range sensor if you have not already changed it. If you changed the sensor already, then check to see if there is power to the plug on the harness to the sensor. Check the ground if there is already power, however, if the there is no power, then trace the wires back to the computer and check the wires on the computer for power. If there is power at the computer, then there is a break in the harness between the computer and the sensor. If there is no power, then check the power and ground to the computer. If the power and ground on the computer is okay, then you would need a new computer.

I recommend back tracking all of the connections that you made when you installed the remote start switch and see if the switch is tied into the computer correctly. If you need assistance with diagnosis, I recommend seeking out a professional to pinpoint the cause of the Check Engine Light code.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing


Experienced Mechanic?

Earn up to $70/hr

What others are asking

My car won't go in 2nd gear

If you can select all other gears but 2nd, then the issue is likely to be internal to the transmission (as opposed to the clutch). To be sure, the external shift mechanism should be inspected but if that checks out,...

After driving my car, the next day will not start. It turns over but will not start 1993 Lexus LS400

Hello - the first task is to get any problem codes, whether the Check Engine is illuminated or not. The next step is to determine whether you have spark at the plugs, or the fuel pump runs on those days...

Rattling Sound coming from underneath the car.

Hi there. Sounds like one of the heat shields on the exhaust system has broken a weld and is vibrating as the engine is revved up. Jack the vehicle up and put on jack stands. Go under the vehicle and...

Car hard to turn with a new power steering pump 2007 Ford Taurus

Hi there - I suspect the steering rack may be worn out, and is binding. This would cause the hard steering you are experiencing, regardless of having a new power steering pump. I would recommend a steering system inspection by...

Where is the instrument panel to find the trip reset button to press and hold in order to reset the trip mileage?

Hi there. When resetting the trip mileage on your vehicle, look at the steering wheel and just behind it is the instrument panel (the part that has all of the gauges). Look on the instrument panel for a black small...

Dashboard gauges don't work

There is still a ground path problem from the engine to the instrument cluster, whether through the chassis or not. Might be worth running a new ground wire directly from the engine block to the ground connector on the instrument...

Alternator dead short when power applied.

Firstly, with the battery disconnected you will have continuity between the positive cable to the ground of the body or engine if you have any components hooked up or have fuses in. You are getting a complete circuit through some...

Cleaning two-stroke and four-stroke engines

2-stroke engines don't have an oil sump. There is no actual oil in the engine to lubricate it. So you have to mix oil with gasoline. Usually, it is in a 40:1 ratio, with 40 parts gasoline and one part...

How do I remove the tonneau cover?

The tonneau cover can be removed to save space. To remove the tonneau, push one of the ends of the cover housing in, then pull the tonneau cover out of its position.

Related articles

P0699 OBD-II Trouble Code:Sensor Reference Voltage “C” Circuit High
P0699 means a fault in the sensor reference C circuit, which also affects the alternative fuel, body, anti-lock brake, and other control modules.
P004E OBD-II Trouble Code: Turbocharger/Supercharger Boost Control “A” Circuit Intermittent/Erratic
P004E means that there is an electrical malfunction with the turbocharger or supercharger boost control due to a leak, or a stuck westgate.
P0506 OBD-II Trouble Code: Idle Control System RPM lower Than Expected
P0506 code definition When the P0506 diagnostic trouble code is stored by the Powertrain Control Module (PCM), it is an indication that...