What Does P0705 Mean?
The TCM has detected a malfunction in the Transmission Range Sensor (TRS) A circuit, also known as the PRNDL input or neutral safety switch. This sensor tells the TCM what gear position the driver has selected (Park, Reverse, Neutral, Drive, Low). When this sensor malfunctions, the TCM cannot determine the commanded gear. The driver may notice incorrect gear indicator display, no-start condition, delayed shifting, or the transmission defaulting to limp mode.
Common Causes
35%
Faulty transmission range sensor — worn contacts, internal short, or mechanical misalignment
25%
Misadjusted manual shift linkage or cable causing the sensor to read between positions
20%
Wiring or connector damage in the TRS circuit — corrosion, broken pins, or water intrusion
12%
Transmission range sensor mounting bolts loose or sensor housing cracked
8%
TCM internal fault in the range sensor input processing circuit
Diagnostic Steps
1
Monitor the TRS signal on the scan tool while slowly moving the gear selector through all positions (P-R-N-D-3-2-1). Each position should display correctly without dropouts, flickers, or invalid readings.
2
Inspect the shift linkage/cable from the gear selector to the transmission — verify it moves freely without binding, and the cable end bushings are intact. Worn bushings allow slack that causes between-position readings.
3
Test the TRS electrically by measuring resistance or voltage at the sensor connector in each gear position. Compare readings to the manufacturer service manual specification chart.
4
Check the TRS mounting on the transmission — if the sensor has slotted adjustment holes, verify alignment marks are correct. Some sensors require a special alignment procedure after installation.
5
Inspect the TRS connector and wiring for corrosion or fluid contamination — the sensor is mounted on the transmission and exposed to road spray, oil leaks, and heat.
Estimated Repair Cost
$100 - $500
Parts + labor, varies by vehicle and location
The TCM has detected a malfunction in the Transmission Range Sensor (TRS) A circuit, also known as the PRNDL input or neutral safety switch. This sensor tells the TCM what gear position the driver has selected (Park, Reverse, Neutral, Drive, Low). When this sensor malfunctions, the TCM cannot determ...
The most common cause of P0705 (Transmission Range Sensor A Circuit malfunction (PRNDL Input)) is: Faulty transmission range sensor — worn contacts, internal short, or mechanical misalignment
Typical repair costs for P0705 range from $100 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A faulty TRS can cause the starter to engage in gear (safety hazard), the reverse lights to not illuminate when in reverse, or the transmission to shift unpredictably. If the neutral safety function is compromised, the vehicle could potentially start in Drive or Reverse. Limit driving to reaching a repair facility if the transmission is in limp mode.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0705 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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