P0460 on 2014-2020 Acura RLX: Fuel Level Sensor Circuit Fault Causes and Fixes

What's Unique About the 2014-2020 Acura RLX

For the Acura RLX (and some contemporary Acuras like the RDX), this code has a very specific and well-documented cause that is not a hardware failure. Acura released Technical Service Bulletin 19-068, explicitly stating that under certain conditions, the original PCM software can misinterpret normal signals from the fuel level sensor and incorrectly trigger the P0460 code. However, this TSB specifically applies only to the 2020 RLX Sport Hybrid model, not the entire 2014-2020 range. For any RLX, checking for software updates is still a wise first step, but for models other than the 2020 Hybrid, hardware diagnostics are more likely to be necessary.

Symptoms You May Notice

• Check Engine Light is on
• Fuel gauge is inaccurate, erratic, fluctuating, or stuck on Full or Empty.
• Low fuel warning light may come on unpredictably or not at all.
• The 'Distance to Empty' display is unreliable.

Most Likely Causes

1. Outdated Powertrain Control Module (PCM) Software 🔴 High Probability → Shop Engine Control Module (ECM) Acura issued TSB 19-068 (Version 2, April 2020) specifically for this issue on the 2020 RLX Sport Hybrid, stating the PCM can misinterpret normal sensor data and set P0460 falsely. This TSB also applies to the 2019-20 RDX.
   How to confirm: An Acura dealership or a qualified independent shop with Acura's diagnostic tool (i-HDS) can check your vehicle's service history or connect to the car to see if the PGM-FI software update (Template ID B19068B for the RLX Sport Hybrid) has been applied.
   Typical fix: Update the PGM-FI software at an Acura dealership. This is not a DIY repair as it requires proprietary software and tools. The update itself is quick, taking about 0.2 hours of labor time according to the TSB.
   Est. part cost: $0
2. Faulty Fuel Level Sending Unit 🟡 Medium Probability → Shop Fuel Tank Sending Unit If the software is confirmed to be up-to-date, the next possibility is hardware failure. The sending unit, part of the fuel pump module, uses a float and a variable resistor. Over time, the resistor strip can wear out or become corroded from fuel contaminants, leading to incorrect readings.
   How to confirm: A technician can access the fuel pump module and test the resistance of the sending unit with a multimeter while moving the float arm. The readings should change smoothly within a specific range noted in the service manual. An open circuit or erratic jumps in resistance indicate a failed unit.
   Typical fix: Replace the fuel pump module assembly, which contains the fuel level sending unit. Access is typically under the rear seat after removing the seat cushion. 🎬 See this step-by-step fuel pump replacement walkthrough
   Est. part cost: $440-$880
3. Wiring or Connector Issue ⚪ Low Probability While less common, wiring can be damaged by road debris or rodents, and connectors can corrode, especially the main connector on top of the fuel tank which is exposed to the elements under the car.
   How to confirm: Visually inspect the wiring harness from the PCM to the fuel tank. Check the connector on top of the fuel pump module for corrosion, moisture, or bent/broken pins. A continuity test with a multimeter can confirm if there is an open or short in the circuit between the PCM and the sensor.
   Typical fix: Repair the damaged section of the wire or clean/replace the corroded connector.
   Est. part cost: $5-$50

Rare But Worth Checking

• Faulty Instrument Cluster: → Shop Instrument Cluster In very rare cases, the instrument cluster (gauge control module) itself can fail to interpret the signal from the PCM correctly, causing a false gauge reading even if the PCM has the correct data. This is highly unlikely and should only be considered after all other causes are ruled out.
• Faulty Powertrain Control Module (PCM): → Shop Engine Control Module (ECM) A hardware failure within the PCM is extremely rare but possible. This is a last-resort diagnosis after confirming the sensor, wiring, and software are all good.

Diagnosis Steps

1. Connect an OBD-II scanner to confirm P0460 is the primary code stored. If P0462 or P0463 are also present, they should be diagnosed first.
2. Crucially, if you have a 2020 RLX Sport Hybrid, contact an Acura dealer or qualified shop to determine if TSB 19-068 applies and if the PGM-FI software update has been performed. If not, this is the first and most likely fix. For all other RLX models, checking for any available software updates is still recommended before hardware replacement.
3. Use an advanced scan tool (like the Acura i-HDS) to run the Gauge Control Module Self-Diagnostic Function to check for faults in the instrument cluster itself.
4. Visually inspect the wiring harness and the main electrical connector on top of the fuel pump module (access is typically under the rear seat cushion) for any signs of corrosion, damage, or loose connections.
5. If wiring appears intact, perform a resistance test on the fuel level sending unit itself. This involves disconnecting it and using a multimeter to measure its resistance as you manually move the float arm. Compare the readings to the manufacturer's specifications. A smooth, linear change is expected.
6. Perform continuity checks on the wiring between the fuel tank unit connector and the Gauge Control Module connector as per the service manual. Check for shorts to ground (resistance should be 1 MΩ or more) and open wires (resistance should be 1.0 Ω or less).
7. If the sending unit fails the resistance test, it needs to be replaced. If it passes and wiring is confirmed good, the fault may lie in the Gauge Control Module or, in very rare cases, the PCM.

Parts You'll Likely Need

• Fuel Pump Module Assembly (OEM #17045-TY2-A01) — This assembly contains the fuel level sending unit. For non-hybrid models, this is the correct part. It is the most common hardware failure after the software issue is ruled out and is replaced as a unit.
  Trusted brands: Acura (OEM), Delphi, Denso
  OEM price range: $430-$630
  Aftermarket price range: $250-$450

Related Codes That Often Appear With This One

• P0461 — Indicates the fuel level sensor circuit 🎬 Watch: Quick DIY fix for the P0460 code signal is out of the expected performance range.
• P0462 — Indicates the fuel level sensor circuit has low input (short to ground). If present, this code should be diagnosed before P0460.
• P0463 — Indicates the fuel level sensor circuit has high input (open circuit). If present, this code should be diagnosed before P0460.

Technical Service Bulletins (TSBs) & Recalls

• Acura TSB 19-068 (Version 2, April 17, 2020): MIL Comes On with DTC P0460. States the possible cause is PCM software misinterpreting sensor inputs and the fix is to update the PGM-FI software. It applies to 2019-20 RDX and 2020 RLX Sport Hybrid.

Platform-Specific Known Issues

• Acura TSB 19-068: On the 2020 RLX Sport Hybrid, the PCM software may misinterpret normal fuel level sensor inputs, causing a false P0460 code. The fix is a PGM-FI software update.
• Safety Recall (NHTSA 20V314000): Affects 2019-2020 RLX models (and Sport Hybrid) for a failing low-pressure fuel pump motor that can cause the engine to stall. While this doesn't directly cause P0460, it involves the same fuel pump assembly where the sensor is located. A replacement may have been performed under this recall.

Mechanic-Grade Diagnostic Values

• Shorted Wire Check (FUEL GAGE+ line to Body Ground) — expected: 1 MΩ or more. Failure: Resistance less than 1 MΩ indicates a short in the wire between the gauge control module and the fuel tank unit.
• Open Wire Check (FUEL GAGE+ line continuity) — expected: 1.0 Ω or less. Failure: Resistance greater than 1.0 Ω indicates an open (break) in the wire between the gauge control module and the fuel tank unit.
• Fuel Level Sending Unit Resistance — expected: A smooth, linear change in resistance as the float arm is moved. While not specific to the RLX, a common Honda/Acura range is approximately 5-10 Ohms at Full and 100-110 Ohms at Empty.. Failure: An open circuit (infinite resistance), a short (near zero resistance), or erratic, non-linear jumps in the reading as the float is moved.

Scan Tool Commands That Help

• Acura i-HDS (Honda Diagnostic System): Gauges Self-Diagnostic Function — Use this function to rule out a failure within the instrument cluster itself. The test will sweep all gauges, check indicator lights, and verify communication lines. This should be done before condemning the fuel sending unit if wiring checks out. The path is: BODY ELECTRICAL -> GAUGES -> FUNCTIONAL TESTS -> self-diagnostic function.

Wiring & Ground Locations

• Gauge Control Module — Located behind the left side of the dashboard, integrated with the main instrument cluster.. This module receives the signal from the fuel level sensor (via the PCM) and drives the physical fuel gauge. Connectors here are a key test point.
• G501 — A chassis ground point located at the upper left end of the dash.. The gauge control module and other dash electronics rely on this ground. A poor connection at G501 can cause erratic gauge behavior and various electrical faults.
• Fuel Tank Unit 4P Connector — The 4-pin electrical connector on top of the fuel pump module, accessed from under the rear seat cushion.. This is the primary connection point for the fuel level sensor. It should be inspected for corrosion or damage and is the main access point for testing the sensor's resistance and wiring continuity.

Real Owner Repair Stories

• Acurazine Forum User Experience (2014+ Acura RLX) — Car stuttered for several seconds before starting, and eventually would not start at all. This is representative of broader forum discussions where weak batteries cause numerous, seemingly unrelated electronic glitches and warnings on the dashboard.
  ❌ Tried (didn't work) Letting the car sit for two weeks, which drained the battery completely.
  ✅ What actually fixed it The dealership replaced the 12V battery under warranty, which resolved the starting issue. For a P0460 code, a weak or failing battery can introduce voltage irregularities that cause the PCM or gauge module to misinterpret the fuel level signal, making a battery test a valid early diagnostic step.

OEM Part Supersession History

• 17045-TY2-A00 → 17045-TY2-A01 — Standard part revision or supplier change.
  Heads up: Applies to non-hybrid (FWD) Acura RLX models.
• 17045-TY3-000 → 17045-TY3-010 — Standard part revision or supplier change.
  Heads up: Applies ONLY to RLX Sport Hybrid models.

Model Year Variations Within This Range

• 2020 Only: Acura TSB 19-068 for a false P0460 code applies specifically to the 2020 RLX Sport Hybrid model, not the entire generation or the non-hybrid version.
• 2014-2020: The Fuel Pump Module Assembly is different between the standard (FWD) and Sport Hybrid (SH-AWD) models. The standard model uses part #17045-TY2-A01, while the Sport Hybrid uses #17045-TY3-010. The fuel tanks also have different capacities (18.5 gal for standard vs. 15.1 gal for hybrid).
• 2018-2020: The RLX received a significant facelift for the 2018 model year, which included a new 10-speed automatic transmission for the standard model and other electronic updates. While the fuel pump part numbers did not change, be aware of potential differences in wiring or control logic on post-facelift models.

Diagnostic Flowchart

Other Known Issues on This Vehicle

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

• Infotainment System Glitches (Blank/Frozen Screen) 🟠 Medium — Common, especially on earlier 2014-2015 models. Can be intermittent. (Ref: TSB 15-001 suggests a software update may fix some issues.)
• Suspension Rattle/Clunk Over Bumps 🟡 Low — Common on 2014 models. A rattling or clunking noise from the front suspension. (Ref: TSB 14-040 provides a fix by installing new front strut noise kits.)
• Electronic Parking Brake (EPB) / Emissions System Warning Lights 🟠 Medium — Frequently reported. Multiple unrelated warning lights appear simultaneously, often caused by a weak 12V battery, not an actual fault in the EPB or emissions systems. (Ref: TSB 22-005 addresses a similar issue on other Acura models with a software update for the VSA modulator.)
• Weak 12V Battery Causing Widespread Electronic Issues 🟠 Medium → Shop Vehicle Battery — Very common, especially on Sport Hybrid models and vehicles that are not driven daily. A weak battery can cause a cascade of seemingly unrelated error messages.
• Chirping Noise from Timing Belt Area 🟡 Low — Reported on early models after the engine warms up. (Ref: TSB 14-025 describes the cause as the timing belt contacting the crankshaft pulley edge.)
• Precision All-Wheel Steer (P-AWS) System Issues 🔴 High — A notable concern for 2014-2015 models, with owners reporting unexpected swerving or fishtailing. (Ref: Multiple recalls addressed related components like loosened control arm bolts and faulty collision mitigation braking logic.)

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: For this repair, a used fuel pump module assembly is NOT recommended. The assembly contains the low-pressure fuel pump motor, which is a known failure point and was subject to a major safety recall. The risk of installing a used pump that could fail and cause the engine to stall is too high.

Donor-vehicle mileage cap: roughly under 30000 miles for the part to have meaningful remaining life.

What to inspect on the donor part:

• Verify the part number EXACTLY matches your original (Standard vs. Hybrid).
• Inspect the electrical connector pins for any green or white corrosion, moisture, or physical damage.
• Check the plastic housing for cracks or signs of heat damage.
• Avoid parts from vehicles that have been sitting for over a year, as old fuel can damage the sending unit resistor and pump.
• Ask for the VIN of the donor car to check if it was part of the fuel pump recall and if the repair was performed.

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

• Fuel Pump Module Assembly

Aftermarket brands forum-validated for this vehicle:

• Delphi
• Denso

Real Owner Stories

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

Related OBD-II Codes

• P0462 — Fuel Level Sensor Circuit Low Input; the diagnostic steps recommend diagnosing this code before P0460 if both are present.
• P0463 — Fuel Level Sensor Circuit High Input; similar to P0462, this circuit-specific code should be addressed prior to the rationality code P0460.

Frequently Asked Questions