P0706 on 2006-2013 Chevrolet Impala: Transmission Range Sensor Fault, Causes, and Fixes

What's Unique About the 2006-2013 Chevrolet Impala

The 2006-2013 Chevrolet Impala belongs to the ninth generation, which primarily uses the 4T65-E automatic transmission for 2006-2011 models. A key feature of this platform is that the Transmission Range Sensor (TRS) is an external component bolted to the side of the transmission case, usually on the driver's side. This makes it much more accessible and easier to replace for a DIY mechanic. For the 2012-2013 model years, the Impala was updated with a 3.6L LFX V6 and a 6-speed 6T70 transmission. On these models, the range sensor function is handled by an Internal Mode Switch (IMS) located inside the transmission, making it a more complex, professional-level repair.

Symptoms You May Notice

• Check Engine Light is on
• Engine will not start or crank when in Park, but may start in Neutral.
• Incorrect gear selection displayed on the instrument cluster (PRNDL).
• All PRNDL segments on the dash display are lit up or highlighted simultaneously.
• Vehicle may enter 'limp mode,' getting stuck in a single gear.
• Harsh or delayed gear engagement.
• Reverse lights do not turn on when in Reverse.

Most Likely Causes

1. Faulty Transmission Range Sensor (Neutral Safety Switch) 🔴 High Probability → Shop Transmission Assembly On 4T65-E models (2006-2011), the sensor is mounted externally on the transmission, exposing it to road grime, moisture, and heat. Over time, the internal plastic splines and electrical contacts wear out or corrode, causing erratic signals.
   How to confirm: Use a scan tool to monitor the gear position data from the sensor while shifting. If the data is erratic, doesn't match the shifter position, or shows an invalid combination of signals, the sensor is likely bad. You can also test the sensor's internal contacts with a multimeter.
   Typical fix: Replace the Transmission Range Sensor. This involves disconnecting the shift linkage and electrical connector, removing the two bolts holding the sensor, and installing the new one. 🎬 Watch: How to replace the sensor without special tools. The new sensor must be properly aligned.
   Est. part cost: $40 - $150
2. Damaged Wiring or Connector 🟡 Medium Probability The wiring harness and connector for the sensor are located on the side of the transmission and can be damaged by road debris, heat, or corrosion from water and salt, especially in rust-belt regions.
   How to confirm: Visually inspect the wiring harness leading to the sensor for any signs of cracking, melting, or physical damage. Check the connector pins for corrosion, moisture, or a loose fit. Perform a wiggle test on the connector while monitoring live data on a scan tool.
   Typical fix: Repair the damaged section of wire or clean/replace the electrical connector.
   Est. part cost: $5 - $50
3. Misadjusted Transmission Range Sensor or Shift Linkage ⚪ Low Probability → Shop Transmission Assembly
   How to confirm: If the vehicle starts in Neutral but not Park, the sensor's alignment may be off. Check if the shift cable is loose, stretched, or if the sensor itself has rotated slightly on its mounting bolts.
   Typical fix: Loosen the sensor's mounting bolts and rotate it slightly until the correct gear position is read by the scan tool in both Park and Neutral. A common method is to place the shifter and the transmission lever in Neutral, then align the marks on the sensor's body and its central shaft before tightening the bolts.
   Est. part cost: $0

Rare But Worth Checking

• Faulty Transmission Control Module (TCM) or Powertrain Control Module (PCM): → Shop Transmission Assembly This is very rare. Before condemning the control module, all other possibilities must be exhaustively ruled out. A poor ground connection to the TCM/ECM is a more likely cause than internal module failure.

Diagnosis Steps

1. Scan for Codes: Use an OBD-II scanner to confirm P0706 and check for other related codes like P0700.
2. Check Battery Voltage: Ensure the battery is fully charged and the terminals are clean. Low voltage can cause erratic electronic behavior.
3. Inspect the Sensor and Wiring: Locate the Transmission Range Sensor on the driver's side of the transmission. Visually inspect the sensor, its connector, and the wiring harness for any obvious signs of damage, corrosion, or loose connections.
4. Test Sensor with Scan Tool: Connect a scan tool that can read live transmission data (e.g., GM Tech 2). Observe the 'Trans Range' or 'Gear Position' PID. As you move the shifter through P, R, N, D, etc., verify that the reading on the scan tool matches the shifter position instantly and without glitches. Watch for invalid signal combinations.
5. Check for No-Start in Park: A classic test for this issue is confirming if the car fails to start in Park but starts correctly when shifted to Neutral. This strongly points to a bad or misaligned sensor.
6. Check Adjustment: If the sensor is being replaced or suspected of misalignment, ensure it is aligned correctly. The standard procedure is to put the transmission's manual shift lever in the NEUTRAL position, then install the sensor, aligning the marks on the sensor body with the mark on the shaft.
7. Test the Sensor Manually: If a scan tool isn't available, you can disconnect the sensor and use a multimeter to test for continuity/resistance across the different pins as you manually move the selector lever, comparing your readings to a service manual diagram.
8. Replace the Sensor: If the sensor fails the tests or is the most likely cause after eliminating wiring issues, replace it with a new part.

Parts You'll Likely Need

• Transmission Range Sensor / Neutral Safety Switch (OEM #24229422) — This is the most common point of failure for the P0706 code on this vehicle. The ACDelco professional-grade equivalent is part number D2262C. 🎬 See this step-by-step guide to diagnose and replace the switch.
  Trusted brands: ACDelco, Dorman, Standard Motor Products
  OEM price range: $90-$150
  Aftermarket price range: $40-$80

Related Codes That Often Appear With This One

• P0700 — P0700 is a generic code that simply means the Transmission Control Module (TCM) has stored a fault code. It will almost always be present alongside a more specific transmission code like P0706.
• P0705 — This code indicates a malfunction in the entire sensor circuit, while P0706 points more specifically to a performance or range issue. They are very closely related and can appear together if the sensor signal is completely lost or nonsensical.

Platform-Specific Known Issues

• A recall (14048) was issued for the 2014 model year for a faulty transmission shift cable adjuster. While not for the 2006-2013 generation, a stretched or damaged shift cable can cause similar symptoms of gear indicator mismatch and should be inspected if a new range sensor does not resolve the issue.
• This platform is highly susceptible to transmission cooler line rust and leakage. Owners should periodically inspect the lines running from the transmission to the bottom of the radiator for wetness or drips, as a significant fluid loss can destroy the transmission, a far more costly repair than the P0706 fault.

Mechanic-Grade Diagnostic Values

• Transmission Range Sensor (TRS) Resistance (for 4T65-E) — expected: The 4T65-E uses a pressure switch manifold, not a variable resistor. The TCM reads a combination of open/closed states from pressure switches A, B, and C to determine gear. A scan tool is the proper way to read the switch states (e.g., Park/Neutral = C open, B open, A open).. Failure: A scan tool showing an invalid or irrational combination of switch states that doesn't correspond to any gear.
• Ground Circuit Voltage Drop at TCM/ECM — expected: Less than 0.1V (100mV). Failure: A reading higher than 0.1V indicates high resistance in the ground circuit (e.g., at G101 or G111), which can cause incorrect sensor readings and trigger P0706.

Scan Tool Commands That Help

• GM Tech 2 / GDS2: Data Display > Transmission Data > PRNDL Status — This is the primary diagnostic screen for P0706. It allows a technician to see the raw A, B, C, and P switch states that the TCM is receiving from the range sensor/pressure manifold. The technician can shift the lever through all positions and confirm the switch states match the service manual chart for each gear. An incorrect pattern confirms a sensor, wiring, or connector fault.

Wiring & Ground Locations

• G111 — On the transmission-to-engine bolt, located above the starter motor (for non-5.3L engines).. This is a primary ground point for the Transmission Control Module (TCM). Corrosion or a loose connection here can cause a voltage drop, leading to erratic signals and codes like P0706, even with a perfectly good sensor.
• G101 — Located at the front left of the engine, on the lower block.. This ground serves the Engine Control Module (ECM), Transmission Control Module (TCM), and the Park/Neutral Position Switch itself. A fault at this single point can disrupt the entire circuit.
• X175 (4T65-E) — The main 20-pin round electrical connector for the 4T65-E transmission, located on the side of the transmission case near the range sensor.. This is the main pass-through for all signals from the internal pressure switches. Corrosion, moisture, or bent pins in this connector are a common cause of P0706 and should be inspected before condemning the sensor.

Documented NHTSA Reports

While the following reports involve a different model (Tahoe), they represent documented instances from the same manufacturer where P0706 appeared alongside other transmission and communication faults. NHTSA ODI #11684054 and NHTSA ODI #11684061 describe cases where diagnostic trouble codes including P0700, P0717, P2714, P2716, and P0706 were present but not fully investigated by service centers. Similarly, NHTSA ODI #11673916 notes a case of delayed acceleration where P0706 and various U-codes were found, but the technician only replaced the battery without performing a test drive.

Real Owner Repair Stories

• ImpalaForums user post (2008 Chevrolet Impala LT 3.5L) — Check engine light with code P0706. Car would not start in Park, but would start in Neutral. Gear indicator on dash was erratic.
  ❌ Tried (didn't work) Replaced the external Transmission Range Sensor (Neutral Safety Switch) with a new aftermarket part. The problem persisted intermittently.
  ✅ What actually fixed it The owner traced the ground wire from the TCM. The ground connection at the engine block (likely G111) was found to be corroded. After removing the bolt, cleaning the terminal and the block surface with a wire brush, and re-securing the connection, the code was cleared and did not return. The starting and shifting issues were resolved.

OEM Part Supersession History

• 24229422 → 24298931 — Part consolidation and potential minor design updates by GM.
  Heads up: The new part number is a direct replacement for the original and is fully compatible with vehicles that used the 4T65-E transmission.

Model Year Variations Within This Range

• 2006-2011: These models primarily used the 4T65-E 4-speed automatic transmission. For P0706, the fault lies with the external Transmission Range Sensor (PN 24229422) or its associated wiring/grounds.
• 2012-2013: These models received the 3.6L LFX V6 and the 6T70 6-speed automatic transmission. The range sensing function is performed by an Internal Mode Switch (IMS) which is part of the TEHCM/valve body assembly inside the transmission. A P0706 code on these years points to an internal transmission issue, often failed pressure switch discs on the TEHCM, and is a much more involved repair.

Diagnostic Flowchart

Other Known Issues on This Vehicle

Issues unrelated to this code that are worth knowing about as an owner of this generation:

• HVAC Blend Door Actuator Failure 🟡 Low — Extremely common. Owners report a loud, repetitive clicking or tapping sound from behind the glove box. The plastic gears inside the actuator strip, causing the noise.
• Intermediate Steering Shaft Clunk 🟠 Medium — Very common. A clunking or popping noise is heard and felt through the steering wheel, especially during low-speed turns. The issue is a lack of grease in the collapsible intermediate shaft. (Ref: A Technical Service Bulletin (TSB) was issued for this problem, recommending replacement of the shaft. The OEM part was discontinued but aftermarket versions (like Dorman 425-158) are widely available.)
• Transmission Cooler Line Leaks 🔴 High → Shop Transmission Assembly — Common failure point. The metal lines that run from the transmission to the radiator are prone to rust and corrosion, leading to transmission fluid leaks. If not addressed, a major leak can lead to transmission failure due to fluid loss. The fittings at the radiator can also be a source of the leak.
• Excessive Engine Oil Consumption 🟠 Medium — Reported by many owners, particularly for the 2006 model year. Can be caused by worn piston rings or valve seals, leading to premature wear if oil levels are not monitored closely.
• Power Door Lock Actuator Failure 🟡 Low — A common electrical nuisance where one or more door locks stop working electronically.

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: For the 2006-2011 models with the external sensor, buying a used sensor from a low-mileage donor vehicle is a reasonable option to save money, as it is an easily accessible part. For the 2012-2013 models, a used TEHCM/valve body is not recommended due to the high labor cost of installation and the risk of the used part having the same inherent pressure switch failure.

Donor-vehicle mileage cap: roughly under 80000 miles for the part to have meaningful remaining life.

What to inspect on the donor part:

• Check the electrical connector pins for any signs of green or white corrosion.
• Ensure the plastic housing is not cracked or showing signs of heat damage.
• Verify the donor vehicle is from a region without heavy road salt use to minimize corrosion risk.
• Ask for the donor vehicle's VIN to confirm mileage and model year compatibility.

OEM-only on this vehicle (don't cheap out):

• For 2012-2013 models requiring TEHCM work, using a remanufactured OEM (ACDelco) TEHCM or a reputable aftermarket pressure switch repair kit is strongly advised over a junkyard part.

Aftermarket brands forum-validated for this vehicle:

• ACDelco (Professional Grade)
• Standard Motor Products (SMP)
• Dorman (often provides design improvements over OEM)

Brands owners have reported issues with on this vehicle:

• No-name, unbranded sensors from online marketplaces should be avoided, as their internal contacts may fail prematurely, leading to a repeat repair.

Real Owner Stories

Aggregated from forums and TSBs cited above. Mileages and costs reflect what owners reported in those sources.

Related OBD-II Codes

• P0700 — A general transmission control system malfunction code that often appears alongside P0706 to indicate the TCM has requested MIL illumination.

Frequently Asked Questions