What Does P0122 Mean on a 2019 Honda CR-V?
On your 2019 Honda CR-V, the P0122 trouble code signals that the ECM has recorded a throttle position sensor circuit voltage reading below the minimum acceptable threshold — typically under 0.2 volts on a circuit that should register between 0.5 and 4.5 volts during normal operation. The ECM interprets this sub-floor reading not as an unusual throttle position but as definitive evidence of a circuit failure, and it responds with protective measures that severely restrict the vehicle's drivability.
The 2019 CR-V is a 5th-generation model equipped with Honda's 1.5L VTEC turbocharged engine — the same platform as the 2017–2022 generation. By 2019, these engines had accumulated a track record of certain maintenance needs, including attention to throttle body connector integrity in climates with road salt use. The throttle body is located in the compact engine bay between the intercooler outlet piping and the intake manifold, and the wiring connector is exposed to both heat and debris.
Investigating P0122 on a 2019 CR-V means this vehicle has been on the road for five or more years. Connector corrosion, harness abrasion, and normal wear on electrical components make electrical root causes very plausible on a vehicle of this age.
Symptoms of P0122 on the 2019 Honda CR-V
P0122 symptoms on the 2019 CR-V can range from intermittent nuisances to immediate driving hazards:
- Check Engine Light on — typically illuminates suddenly, not as a gradual progression
- Limp mode — severe power restriction limiting the vehicle to highway-unsafe speeds; the CR-V may top out at 20–30 mph in full limp mode
- Engine stalling — can occur at idle, when decelerating to a stop, or even at highway speeds if the fault is intermittent and worsening
- Dead or hesitant throttle — accelerator pedal inputs produce no response or a severely delayed response
- Rough idle with engine hunting — the engine surges and dips as it attempts to maintain idle without valid throttle position data
- VSA and other warning lights — secondary systems that rely on throttle position data may also trigger warning lights
On the 2019 model specifically, owners in salt-belt states (upper Midwest, Northeast) should pay particular attention to the throttle body connector area, as five or more winters of salt exposure significantly increases the probability of connector corrosion as the primary fault.
Top Causes of P0122 on the 2019 Honda CR-V
After five or more years of service, the diagnostic clues on a 2019 CR-V point toward age-related electrical degradation more than manufacturing defects:
- Connector corrosion and pin oxidation (50% of cases at this age) — The multi-pin connector at the throttle body is susceptible to oxidation and corrosion, especially after multiple winters. Corroded pins increase resistance and drop voltage below the ECM's threshold. Cleaning with electrical contact cleaner and treating with dielectric grease is the first diagnostic and repair step.
- Throttle body internal TPS failure (28% of cases) — The TPS is permanently integrated into the throttle body. At 5+ years of age and potentially 60,000–100,000+ miles of operation, internal wear or failure of the TPS track is a realistic possibility. Honda HDS live data will show a fixed low or erratic voltage regardless of throttle position if the internal TPS has failed.
- Wiring harness abrasion or insulation damage (15% of cases) — After years of engine vibration and heat cycling, wiring insulation can crack, and wire routing points where the harness contacts metal components can develop bare spots that cause shorts to ground. A hands-on inspection of the full harness run is essential.
- ECM 5-volt reference circuit issues (5% of cases) — While less common, degraded ECM connectors or a short to ground in the 5V reference circuit will artificially suppress TPS voltage. Testing reference voltage at the throttle body connector isolates this possibility quickly.
- Throttle body carbon buildup causing sensor fouling (2% of cases) — Excessive carbon accumulation around the throttle plate can, in extreme cases, contact and damage the TPS assembly or its wiring. This is more of a contributing factor than a standalone cause.
Estimated Repair Costs for the 2019 Honda CR-V
As an out-of-basic-warranty vehicle, all costs fall to the owner unless federal emissions warranty applies:
- Connector cleaning and terminal repair: $50–$150 at an independent shop; DIY cost is minimal with electrical contact cleaner and a terminal cleaning kit
- Throttle body replacement (1.5L turbo): $300–$500 parts and labor; sourcing a quality OEM-equivalent or Honda Genuine part is recommended for reliable TPS calibration
- Wiring harness repair: $150–$350 depending on damage location and repair complexity
- ECM diagnosis and repair: $200–$500+
For a 2019 CR-V, the independent shop route with a technician experienced in Honda systems is often the best value. Dealer rates for a post-warranty vehicle add cost without necessarily adding diagnostic precision.
Urgency and Warranty Guidance for 2019 CR-V Owners
P0122 is an immediate-urgency code regardless of vehicle age. Do not continue driving until this is diagnosed and repaired.
Warranty status for a 2019 CR-V: the 3-year/36,000-mile and 5-year/60,000-mile warranties have almost certainly expired. However, Honda's 8-year/80,000-mile federal emissions warranty may still be active depending on your mileage. The throttle position sensor and ECM are covered under this warranty as emissions-control components. If you are under 80,000 miles and within 8 years of your original purchase date, contact a Honda dealer to check emissions warranty eligibility before paying for repairs.
After any throttle body or connector service, perform the Honda idle relearn: key ON for 10 seconds (do not start), then start and allow the engine to idle undisturbed for 10 full minutes.
How AutoDetective AI Can Help
AutoDetective's AI diagnostic system can evaluate your 2019 CR-V's P0122 code in context — identifying whether accompanying codes suggest a connector fault, a throttle body failure, or an ECM reference issue. With repair cost estimates calibrated to your local market, AutoDetective helps you avoid paying for the wrong repair first.