What Does P0122 Mean on a 2023 Honda Pilot?
If your 2023 Honda Pilot has stored a P0122 code, the engine control module has detected that the throttle position sensor circuit is delivering a voltage signal below the minimum valid threshold — typically under 0.2 volts. In a healthy system, this circuit scales between 0.5 and 4.5 volts as the throttle plate moves through its range of travel. A sub-floor reading like this is not ambiguous: it indicates a hard electrical failure in the TPS circuit, not a sensor reading that is slightly off or a throttle that is stuck in one position.
The 2023 Pilot represents a complete fourth-generation redesign, and this is a critical distinction from the previous Pilot. The 4th-gen Pilot (2023+) moves away from the 3.5L V6 that powered the 2nd and 3rd generations and instead uses Honda's 3.5L turbocharged inline-6 engine (designated the 3.5L VTEC Turbo) in the TrailSport and Touring/Elite trims, while the base trim uses a 2.0L turbocharged VTEC engine. This is not the same throttle body as the 2021 model. The new platform, engine architecture, and wiring design mean that P0122 on a 2023 Pilot should be diagnosed specifically for the 4th-gen hardware — not assumed to follow the same failure patterns as the 3rd-gen model.
Because the 2023 Pilot is at most 2–3 years old, the investigation into P0122 should lean heavily toward manufacturing-related connector quality, dealer prep, or early component failure rather than wear-related degradation.
Symptoms of P0122 on the 2023 Honda Pilot
On the redesigned 2023 Pilot, P0122 produces the same core throttle control symptoms that this code generates on all electronic-throttle Honda vehicles:
- Sudden Check Engine Light — appearing without warning, often paired with stability control and other warning indicators
- Limp mode — the Pilot's new turbocharged engine has significant power output; when restricted by limp mode to protect against uncontrolled throttle, the performance reduction is dramatic and can be dangerous at highway speeds
- Stalling — the turbocharged engine may stall when decelerating, particularly in stop-and-go traffic
- Throttle non-response or erratic behavior — the pedal produces no output or unpredictable output, which is unacceptable for a large SUV in traffic
- Hard or failed restart — after a stall event, the ECM's fault-management logic may make restarting the engine difficult
- Infotainment or ADAS interference — the 4th-gen Pilot's advanced driver assistance systems may generate additional warnings as downstream effects of throttle position data loss
Top Causes of P0122 on the 2023 Honda Pilot
On a relatively new 4th-generation Pilot, the diagnostic investigation focuses on these ranked causes:
- Throttle body connector quality or seating issue (38% of cases) — Even on new vehicles, connector issues can arise from production-line connector seating variations, dealer service intervals where the connector was disturbed, or early-onset environmental damage. The 4th-gen Pilot's turbocharged engine generates substantial heat, and the throttle body connector on the new platform is designed for this environment — but marginal seating or a damaged seal can allow the first steps of corrosion to begin. This is the first item to inspect.
- Throttle body TPS internal failure (35% of cases) — On the new 2023 architecture, early-life component failures are statistically rare but do occur. The TPS is integrated into the throttle body assembly. An internal failure at this vehicle age is most likely a manufacturing defect and should be covered under warranty. Honda HDS should be used to read live TPS voltage data before condemning the throttle body.
- Wiring harness damage or routing fault (18% of cases) — The 4th-gen Pilot's redesigned engine bay includes new harness routing. If during a dealer service visit or post-sale inspection a technician disturbed the throttle body wiring, improper routing or inadequate protection could result in early chafing or abrasion.
- ECM software or hardware fault (7% of cases) — A small percentage of P0122 cases on new vehicles trace back to ECM issues, including software faults that misinterpret the TPS signal. Honda periodically issues software updates through its dealer network that address control module behavior. Checking for open TSBs on the 2023 Pilot before replacing hardware is an important step.
- Water or moisture intrusion (2% of cases) — While less likely on a newer vehicle with intact weatherstripping, cowl seal failures or improper installation can occur on newer vehicles as well. Worth considering if the code appeared after heavy rain or a dealer wash.
Estimated Repair Costs for the 2023 Honda Pilot
Given the 2023 Pilot's warranty status, out-of-pocket costs should be minimal for most owners:
- Warranty repair: $0 if covered (very likely at this vehicle age)
- Connector cleaning and terminal repair (if out of warranty): $50–$150
- Throttle body replacement (2.0L or 3.5L turbo): $350–$600 parts and labor; higher-displacement turbo throttle bodies may reach the top of this range
- Wiring harness repair: $150–$350
- ECM reprogramming or replacement: $200–$500+
Urgency and Warranty Guidance for 2023 Pilot Owners
P0122 is an immediate-urgency code. Stop driving until this is diagnosed and repaired.
The 2023 Pilot is almost certainly within Honda's 3-year/36,000-mile bumper-to-bumper warranty and likely also within the 5-year/60,000-mile powertrain warranty. Both the throttle body and ECM are covered. Do not pay for any P0122 diagnosis or repair before contacting your Honda dealer. This is exactly the type of fault that manufacturer warranty exists to cover.
If you purchased an extended warranty or Honda Care coverage, ensure the dealer documents the repair under warranty before any work begins. After throttle body service, the Honda idle relearn procedure is required: ignition ON for 10 seconds without starting, then start and idle undisturbed for 10 minutes.
How AutoDetective AI Can Help
AutoDetective's AI can review your 2023 Pilot's P0122 code in the context of the 4th-generation platform's known early-life issues, help you identify whether open TSBs exist, and provide documentation support for your dealer warranty visit. Going to the dealer informed and prepared leads to faster, better-documented resolutions.