P0705 on 2009-2015 Honda Pilot: Transmission Range Sensor Fixes

What's Unique About the 2009-2015 Honda Pilot

The 2009-2015 Honda Pilot (second generation) uses an external transmission range sensor that is a very common failure point. Unlike some vehicles with internal sensors, this makes for a much more straightforward DIY repair. The most prominent symptoms on this platform are a flashing 'D' (Drive) indicator light and a potential no-start condition, which are classic signs of this specific sensor failing on a Honda of this era. Wiggling the gear shifter to get the vehicle to start is a hallmark sign pointing directly to this sensor.

Symptoms You May Notice

• Flashing 'D' (Drive) indicator light on the instrument cluster.
• Check Engine Light is on.
• Engine will not crank or start.
• Engine only starts in Neutral (N) but not in Park (P), or vice-versa.
• Wiggling the gear shifter allows the car to start.
• Incorrect gear position displayed on the dashboard (e.g., 'R' and 'N' light up at the same time).
• Reverse lights do not work when in Reverse.
• Harsh, delayed, or erratic transmission shifting.
• Vehicle may be stuck in 'limp mode' (e.g., will not shift past 2nd gear).

Most Likely Causes

1. Faulty Transmission Range Sensor (Neutral Safety Switch) 🔴 High Probability → Shop Transmission Assembly This is a very common failure item on this generation of Honda Pilot and related vehicles due to age, heat, and moisture exposure. The sensor's plastic housing can crack, allowing moisture intrusion.
   How to confirm: Use a scan tool to monitor the transmission range sensor data while moving the shifter. If the displayed gear on the scan tool does not match the shifter's physical position, the sensor is likely bad. You can also test the sensor's electrical circuits for correct voltage/resistance at each gear position per the service manual.
   Typical fix: Replace the transmission range sensor. This part is located on the outside of the transmission, but access often requires removing the battery and battery tray. It is critical that the new sensor is properly aligned in the NEUTRAL position during installation.
   Est. part cost: $40-$180
2. Damaged Wiring or Corroded Connector 🟡 Medium Probability The sensor and its wiring are located under the vehicle, exposed to road debris, moisture, and heat, which can lead to corrosion or physical damage over time.
   How to confirm: Visually inspect the wiring harness and connector going to the transmission range sensor. Look for green/white corrosion on the pins, frayed wires, or loose connections. Perform a 'wiggle test' on the harness while monitoring live data to see if the signal cuts out.
   Typical fix: Clean the connector terminals with electrical contact cleaner. If the wiring is damaged, repair the affected section or replace the connector pigtail. In some cases, a poor connection at the PCM can also be the cause.
   Est. part cost: $5-$50
3. Misadjusted Sensor or Shift Linkage ⚪ Low Probability
   How to confirm: Check if there is excessive play in the shift cable or if the sensor itself has become loose on its mounting bolts. Verify that the sensor's position aligns correctly with the transmission's manual shaft when in each gear.
   Typical fix: Adjust the shift linkage cable or loosen the sensor's mounting bolts and rotate it until it is properly aligned. The alignment procedure requires setting the transmission and shifter to Neutral and then aligning marks on the sensor and transmission case before tightening. 🎬 Watch this step-by-step range switch replacement guide.
   Est. part cost: $0

Rare But Worth Checking

• Faulty Powertrain Control Module (PCM): This is extremely rare. Before suspecting the PCM, all other causes (sensor, wiring, adjustment) must be definitively ruled out. A faulty PCM will usually be accompanied by multiple other seemingly unrelated trouble codes. If P0705 is the only code, the PCM is very unlikely to be the problem.
🎬 See how a faulty PCM and range switch are diagnosed.
• Low or Dirty Transmission Fluid: → Shop Transmission Assembly While not a direct cause of the P0705 electrical code, very low or contaminated fluid can cause erratic shifting behavior that might be misdiagnosed. It's a basic check that should always be performed when transmission issues are present. Some owners report that a simple drain-and-fill of the transmission fluid resolved shifting issues that accompanied the code.

Diagnosis Steps

1. Read the trouble codes with an OBD-II scanner to confirm P0705 is present and note any other codes.
2. Check the transmission fluid level and condition. The dipstick is yellow and located near the battery. Top off or perform a drain-and-fill if necessary.
3. Check for the most obvious symptoms: Does the car fail to start? Do the reverse lights work? Is the 'D' light flashing? Does wiggling the shifter help it start?
4. Visually inspect the transmission range sensor's electrical connector and wiring harness for any signs of corrosion, moisture, or damage. The sensor is on the front/side of the transmission.
5. Use a scan tool with live data capability to monitor the 'Transmission Range' PID. Cycle the shifter through all gears (P, R, N, D, etc.) and verify that the position reported by the scan tool matches the physical gear selector position.
6. If the data is incorrect or erratic, the sensor is the primary suspect. If the data is stable but incorrect (e.g., shows 'N' when in 'D'), an adjustment may be needed.
7. To access the sensor for testing or replacement, you will likely need to remove the battery and the battery tray.
8. If a new sensor is installed, it is absolutely critical to align it properly. With the vehicle in NEUTRAL, align the marks on the sensor body with the corresponding marks on its mounting point before tightening the bolts.
9. If a new sensor does not fix the issue, re-inspect the wiring harness thoroughly for intermittent breaks and check the connections at the PCM.

Parts You'll Likely Need

• Transmission Range Sensor (OEM #28900-RDK-013 (supersedes 28900-RDK-003)) — This sensor is the most common point of failure for the P0705 code on this vehicle, responsible for telling the computer which gear is selected.
  Trusted brands: Honda (OEM), Standard Motor Products (Intermotor), WVE, Wells
  OEM price range: $120-$180
  Aftermarket price range: $40-$90

Related Codes That Often Appear With This One

• P0706 - Transmission Range Sensor Circuit Range/Performance
• P1717 - A related Honda-specific code that can sometimes appear with range sensor issues.

Platform-Specific Known Issues

• On Piloteers.org, numerous threads detail the classic P0705 symptoms. One user with a 2011 Pilot noted, 'Flashing D, CEL on, won't start. Jiggled the shifter and it started right up.' This owner replaced the sensor (noting the difficulty of reaching the bolts under the battery tray) which resolved the issue completely.
• A user on Acurazine with a related J-series V6 experienced a P0705 where replacing the sensor only fixed the problem for two days. The issue returned, and after replacing the sensor again and the wiring pigtail, the problem persisted. This highlights that while the sensor is the most common cause, underlying wiring issues or even faulty aftermarket parts can complicate the diagnosis.
• NHTSA ODI #11174984 describes a scenario where an owner found codes P0700, P0705, and P0740 all present simultaneously, indicating a broader relationship between the range sensor and general automatic transmission system faults.
• In a cross-manufacturer reference for the same make, NHTSA ODI #10544028 notes that a dealership suggested a full transmission replacement for codes P0705 and P0706, though these are often solvable by addressing the range sensor circuit specifically.

Mechanic-Grade Diagnostic Values

• Voltage between PCM connector C10 and ground pins A23/A24 with ignition ON and shifter NOT in Reverse. — expected: Approx. 10V. Failure: If voltage is not ~10V, it indicates a potential short or open in the circuit for the Reverse signal.
• Voltage between PCM connector C12 and ground pins A23/A24 with ignition ON and shifter NOT in Park or Neutral. — expected: Approx. 5V. Failure: If voltage is not ~5V, it points to a fault in the Park/Neutral signal circuit.
• Voltage between PCM connector C20 and ground pins A23/A24 with ignition ON and shifter NOT in Drive. — expected: Approx. 5V. Failure: If voltage is not ~5V, it suggests a problem with the Drive signal circuit.
• Continuity test of the transmission range sensor itself. — expected: Continuity should only be present for the specific gear selected. There should not be continuity for all gears at all times.. Failure: If continuity is present on a pin regardless of the shifter position, the sensor has an internal short and is faulty.

Scan Tool Commands That Help

• Honda Diagnostic System (HDS): Live Data Monitoring (AT Switch Signals) — This is the primary professional diagnostic step. The HDS displays the ON/OFF status for each gear position signal (ATP, ATR, ATN, ATD) sent from the sensor to the PCM. A technician uses this to instantly see if the PCM is receiving an illogical combination of signals (e.g., both Park and Drive ON at the same time), which confirms a sensor or wiring fault without extensive manual testing.

Wiring & Ground Locations

• G101 — On the left rear of the engine.. This is a primary engine and transmission area ground point. A loose or corroded G101 can cause various electrical issues, including erratic signals from transmission sensors that rely on a clean ground reference. A video for a related Honda model shows the range sensor circuit is switched to ground at G101 to complete the circuit.
• G301 — Under the left front of the engine compartment, near the battery tray area.. This ground is physically close to the transmission range sensor and its harness. Corrosion in this area due to battery fumes or moisture can create a poor ground path for the sensor circuit, leading to P0705.
• G401 — Under the left side of the dash.. This is a key interior ground point. While less likely to be the primary cause, issues here can affect the PCM and its interpretation of sensor signals.
• PCM Connectors A (31P) & C (22P) — Located in the engine bay, typically near the firewall or air filter housing.. These are the specific connectors on the Powertrain Control Module where the transmission range sensor signals arrive. Technicians probe specific pins on these connectors (e.g., C9, C10, C11, C12, C20) to test for voltage and continuity from the sensor, allowing them to isolate a fault to the wiring, sensor, or PCM itself.

Real Owner Repair Stories

• Voltage Drop Diagnostics on YouTube (2006 Honda Ridgeline (similar powertrain/electronics)) — P0705 code present.
  ❌ Tried (didn't work) Replacing the transmission range sensor, Replacing the Powertrain Control Module (PCM)
  ✅ What actually fixed it The technician found that the wiring for the reverse signal (white wire) and another gear position (blue wire) were shorted together externally in the harness. Disconnecting the sensor and testing the harness revealed that grounding one wire would incorrectly ground the other. The fix was to repair the wiring harness where the two circuits were shorted.

OEM Part Supersession History

• 28900-RDK-003 → 28900-RDK-013 — Part has been updated by Honda. The new part number is the current replacement.
  Heads up: The parts are interchangeable. 28900-RDK-013 is the correct direct replacement for the original part.

Diagnostic Flowchart

Other Known Issues on This Vehicle

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

• Variable Cylinder Management (VCM) Issues 🔴 High — Very common. Can lead to fouled spark plugs, excessive oil consumption, and eventual piston ring damage. Many owners proactively install a VCM disabling device. (Ref: Honda issued warranty extensions (e.g., TSB 13-082) for some model years to address piston ring replacement due to VCM-related oil consumption.)
• Timing Belt Replacement 🔴 High — This is a critical maintenance item, not a failure. The J35Z4 is an interference engine, meaning a broken belt will cause catastrophic engine damage. The replacement interval is typically every 105,000 miles or 7 years, whichever comes first.
• Torque Converter Judder/Shudder 🟠 Medium — Commonly felt as a vibration between 20-60 mph. Often caused by deteriorated transmission fluid rather than a failed torque converter. (Ref: Honda released multiple TSBs for similar models (e.g., TSB 16-091, 17-014, 17-015) recommending a transmission fluid flush and sometimes a software update to fix the issue.)
• Lower Control Arm Compliance Bushings Failure 🟠 Medium — The large, fluid-filled compliance bushings on the front lower control arms are known to tear and leak, causing clunking noises and alignment issues.
• Air Conditioning (A/C) Compressor Failure 🟠 Medium — The A/C compressor clutch and coil are known failure points, leading to the A/C blowing warm air.

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: A used OEM sensor from a low-mileage donor vehicle can be a cost-effective and reliable alternative to a new aftermarket part, which can have questionable quality. Given that the failure is electronic and not purely wear-based, a used part carries some risk, but may be preferable to a known problematic aftermarket brand.

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

What to inspect on the donor part:

• Inspect the connector pins for any green or white corrosion.
• Check the plastic housing for cracks or signs of heat damage.
• If possible, verify the mileage of the donor vehicle.
• Avoid parts from vehicles with signs of flood damage or front-end collisions that may have impacted the transmission area.

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

• While not strictly 'OEM-only', many professional technicians and forum users express a strong preference for OEM sensors over aftermarket alternatives for this specific part due to higher failure rates of non-OEM brands.

Aftermarket brands forum-validated for this vehicle:

• Standard Motor Products (SMP)
• NTK

Brands owners have reported issues with on this vehicle:

• Unbranded, 'white box' parts from online marketplaces.
• Dorman has a mixed reputation among technicians; some prefer installing a used OEM part over a new Dorman part.

Real Owner Stories

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

Related OBD-II Codes

• P1717 — Often appears alongside P0705 on Honda Pilots; specifically relates to the transmission range switch 'Open' in the ATP R0 position.
• P0700 — A general transmission control system malfunction code that often accompanies specific sensor codes like P0705.

Frequently Asked Questions