🚨 Diagnostic Profile
Vehicle Make: ACURA
Technical Description: Accelerator Position Sensors 1 & 2 Improper Correlation
This diagnostic trouble code indicates that the Powertrain Control Module (PCM) has detected a voltage discrepancy between the two internal sensors housed within the Accelerator Pedal Position (APP) sensor assembly. Modern Acura vehicles utilize a drive-by-wire system, meaning there is no physical cable connecting the pedal to the throttle body. Instead, the PCM relies on these two sensors to cross-check each other for accuracy. If the readings do not correlate within an acceptable tolerance range, the vehicle will often enter a ‘Limp Home Mode’ to prevent unintended acceleration, resulting in significantly reduced engine power until the fault is cleared.
🚨 Repair Difficulty Tier
Difficulty Rating: [Intermediate]
This repair is generally classified as Intermediate. While the physical replacement of the sensor assembly is mechanically straightforward (usually requiring only a screwdriver or small ratchet), accurately diagnosing this specific code requires a professional-grade scanning tool capable of reading live, dual-sensor data (PIDs) simultaneously. A standard multimeter can be used to check for wiring or continuity issues, but without a scanner to view real-time sensor correlation percentages, a technician cannot definitively confirm if the fault lies in the sensor, the wiring harness, or the PCM itself.
🛠️ Resolution Steps
Step 1: Preliminary Inspection
Begin by visually inspecting the electrical connector at the back of the accelerator pedal assembly (located in the driver’s footwell). Look for corrosion, bent pins, or a loose connection. Check the wiring harness for any signs of chafing, pinching, or rodent damage, as these are common causes of intermittent sensor faults, especially if the vehicle is exposed to moisture.
Step 2: Diagnostic Verification
Connect an OBD-II scan tool capable of reading manufacturer-specific live data. Monitor the ‘APP Sensor 1’ and ‘APP Sensor 2’ voltage percentages simultaneously while an assistant slowly presses the accelerator pedal from 0% to 100%. Both sensors should move in a smooth, linear fashion. If one sensor lags, jumps erratically, or fails to reach a full range while the other operates normally, this confirms an internal sensor failure rather than a wiring issue.
Step 3: Resolution & Reset Process
If the live data confirms an internal sensor discrepancy, replace the entire Accelerator Pedal Position Sensor assembly (these are typically sold as a single sealed unit and cannot be repaired individually). After installation, use the scan tool to clear the Diagnostic Trouble Codes (DTCs). It is highly recommended to perform an Idle Learn Procedure or Throttle Body Relearn using the scan tool to ensure the PCM recalibrates to the new sensor’s baseline voltage, followed by a test drive to confirm the code does not return.
📦 Parts, Labor, and Budget Estimates
Required Components/Software: New Accelerator Pedal Position (APP) Sensor Assembly; OEM-level scan tool (such as Honda/Acura HDS or a comparable aftermarket tool with bi-directional control) for the relearn procedure.
Average Component Price: $150 – $350 for the OEM sensor assembly (aftermarket alternatives may be available for less, though OEM is recommended for sensitive drive-by-wire calibration).
Estimated Labor Hours: 0.5 – 1.0 hour for diagnosis and replacement; an additional 0.2 – 0.3 hours for the PCM relearn and test drive verification.