P0705 Code: Range Sensor Circuit — Meaning & Fix

Sun West Transmissions — Glendale, AZ. Free estimates, honest diagnosis and a 3-year / 40,000-mile warranty on qualifying rebuilds and replacements.

The P0705 code stands for “Transmission Range Sensor Circuit Malfunction (PRNDL Input).” In plain English, the computer is not getting a clear, believable signal telling it which gear position you selected: park, reverse, neutral, drive or a manual low gear. Because so many systems depend on that information, a P0705 can cause anything from a no-start to odd shifting to a backup light that does not work.

Sun West Transmissions in Glendale diagnoses range sensor faults on cars, trucks and SUVs. Here is what this code means and how it is fixed.

What the Transmission Range Sensor Does

The transmission range sensor, sometimes called a neutral safety switch, manual lever position sensor, or PRNDL switch, reports the shifter position to the computers. Depending on the design, it is mounted on the outside of the transmission where the shift cable attaches, or inside the transmission on the valve body. Some newer designs integrate it into the transmission control module.

The range sensor tells the vehicle:

• When it is safe to allow the engine to crank (park or neutral only)
• When to turn on the backup lights and backup camera
• Which gear range the driver selected, so the computer can command the right shift pattern
• When to allow certain features, such as remote start or the key release

Common Symptoms of P0705

• Check engine light
• Engine will not crank in park, or cranks only in neutral
• Engine cranks in gear, which is a safety concern
• Backup lights or camera not working
• Gear indicator on the dash blank, flashing or wrong
• Harsh shifts, wrong gear starts or limp mode

Common Causes of P0705

Misadjusted Range Sensor or Shift Cable

On externally mounted sensors, adjustment matters. If the sensor or shift cable is out of adjustment, the shifter position and the sensor reading disagree. Worn cable bushings can cause the same problem. See shift linkage repair.

Failed Range Sensor

Internal contacts wear, and heat and moisture can corrode them. External sensors on some trucks are exposed to road spray and dust, which is why they are a common failure point.

Wiring and Connector Problems

Damaged wiring, corroded pins or a loose connector at the sensor or computer can cause erratic signals. Harnesses near the exhaust can be damaged by heat.

Internal Harness or Valve Body Mounted Sensor

On transmissions with internal range sensors, the fix may require pan removal or valve body work. Fluid condition matters, because debris can affect internal electrical parts.

Computer or Software

Rarely, the problem is the control module or software. This is checked after the sensor, wiring and adjustment are verified. See TCM programming.

What You Can Safely Check

1. Watch the gear indicator as you move the shifter through each position with the brake held. Note any position where it does not match.
2. Check whether the backup lights work in reverse.
3. Note whether the engine starts only in neutral or only after jiggling the shifter.
4. Check for a loose or damaged shift cable at the transmission, without going under an unsupported vehicle.

If the engine will crank with the shifter in drive or reverse, do not use the vehicle until it is repaired. That is a safety hazard, because the vehicle could move as soon as it starts.

How We Diagnose and Fix P0705

At our Glendale shop, we read all transmission codes and watch the range sensor data on a scan tool while moving the shifter through each position. That shows whether the signal matches the shifter. We then inspect the sensor and cable adjustment, test the wiring and connector, and check fluid on internally mounted designs. Learn more on our computer transmission diagnostics page.

Many P0705 repairs are a sensor adjustment or replacement and wiring repair, without removing the transmission. When the sensor is internal, the work involves the valve body area. Related information is on our valve body repair page.

Is It Safe to Drive With P0705?

If the vehicle starts only in park or neutral, shifts normally, and the gear indicator is correct, a careful drive to the shop is usually fine. If the engine cranks in gear, if shifting is erratic, or if the transmission is in limp mode, limit driving and get it inspected promptly.

Related Codes

P0705 often appears with P0700, the general transmission flag. Range sensor problems can also cause symptoms that look like a transmission that won’t shift.

P0705 Code FAQ

Can a bad range sensor cause a no-start?

Yes. If the computer does not see park or neutral, it usually prevents the engine from cranking.

Is P0705 a serious problem?

It can be. It affects starting, shifting and backup lights, and in some cases can allow cranking in gear. It should be repaired promptly.

How much does it cost to fix P0705?

It depends on the vehicle and where the sensor is located. Call (623) 473-9800 for a free estimate.