P0705 – Meaning, Causes, Symptoms, & Fixes

Code P0705 Definition

The engine control module (ECM) and/or transmission control module (TCM) is not receiving a proper signal from the transmission range sensor/switch.

What Does P0705 Mean?

When code P0705 is triggered, the ECM or TCM is not seeing what gear the transmission is in (park, reverse, neutral, drive, or low). If the ECM or TCM can’t verify that the transmission is in park or neutral, it will not allow the vehicle to start. Based on the design of the vehicle, the transmission range sensor/switch (TRS) may be located externally of the transmission (which is easily replaced). It could also be located internally to the transmission and require replacement of the valve body or replacement of the entire transmission assembly to resolve the concern.   

What Are The Symptoms Of Code P0705?

  • Check Engine Light
  • Possible no start
  • Possible start in drive or reverse
  • May only start if you push on shifter
  • Delayed gear engagement
  • Reverse lights don’t illuminate when in reverse
  • No gear position displayed
  • Harsh engagement into gear

*No noticeable adverse conditions in some cases

What Is The Cause Of Code P0705?

  • Faulty Transmission Range Sensor/Switch (TRS)
  • Faulty Valve Body (TRS can be part of this)
  • Faulty Transmission (TRS can be part of this)
  • Misadjusted TRS
  • Frayed or damaged wiring to the TRS
  • Humidity in Tail Lights

How Serious Is Code P0705? – Moderate

This trouble code may have no effect on the function of the car, but it can also cause the car not to start or to start in gear. You are advised to resolve this concern quickly in order to protect yourself and others from harm. 

Code P0705 Common Diagnosis Mistakes

The most common diagnosis mistake is replacing the TRS without checking to see if it was out of adjustment. 

Tools Needed to Diagnose:

  • FIXD
  • Basic Hand Tools
  • Vehicle Specific Service Manual

How To Diagnose And Repair Code P0705?

Difficulty of Diagnosis and Repair (2 out of 5)

  1. Check to see if there are any other codes along with P0705 and clear your Check Engine Light with FIXD.
  2. Check the freeze frame data in order to pinpoint the issue.
  3. Check to see if the Tail Lights have water droplets in them or the lenses are cracked. In some cases, this can cause the lights to short to each other and cause this code. Replace the Tail Lamp Assembly(s) if they are cracked or show evidence of humidity inside the housing.
  4. Locate the Transmission range sensor/switch. If it is internal, you will have to take it to a shop that is equipped to diagnose this type of transmission. If it is external, consult the vehicle’s service manual for an exact procedure to adjust the transmission range sensor/switch and adjust it properly.
  5. Also, check the wiring at the TRS for disconnection or fraying. Repair as needed.
  6. If all of these check out and the code is still populating, replace the transmission range sensor/switch.

Estimated Cost of Repair

For error code P0705, one or more of the below repairs may be needed to solve the underlying issue. For each possible repair, the estimated cost of repair includes the cost of the relevant parts and the cost of labor required to make the repair. 

  • Transmission Range Sensor/Switch $100-$350
  • Tail Lamp Assembly $200-$2000
  • Valve Body $400-$1000
  • Transmission $1800-$4500
  • Transmission Range Sensor/Switch Adjustment $100
  • Wiring repair/replacement $100-$1000

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