P0740 Code: Honda CR-V (2017-2023) - Causes, Symptoms & Fixes

Comprehensive diagnostic guide for OBD2 code P0740 on 2017-2023 Honda CR-V

Important data context

• Owner complaints for this make/model/year/issue: None found.
• Official recalls for this make/model: No recalls found in NHTSA database.
• Data basis note: The guide uses general automotive knowledge for technical explanations and provides 2025 price estimates for repairs. The data shown above indicates no recorded complaints or recalls in the dataset you provided, so the guide emphasizes typical failure modes and diagnostics rather than a proven field distribution for this exact vehicle/years.

CODE MEANING AND SEVERITY

• Code: P0740
• Full meaning: Torque Converter Clutch (TCC) Circuit Malfunction (Torque Converter Clutch Circuit)
• What it indicates on a 2017-2023 Honda CR-V: The transmission control system has detected a fault in the TCC circuit or the torque converter clutch not operating as commanded. The 2017-2023 CR-V uses a 9-speed automatic transmission with a torque converter lock-up clutch; P0740 points to an electrical or hydraulic problem affecting the TCC’s ability to engage or disengage properly.
• Severity and drivability:
  • May cause harsh shifting, slippage, or inability to achieve proper lockup.
  • Could trigger a limp-mode or check engine light (MIL) to stay on.
  • If left unresolved, potential for increased transmission wear, overheating, and reduced fuel economy.
  • Driving with the code present is not recommended for extended periods, especially under load or high-speed driving.

COMMON CAUSES ON HONDA CR-V (2017-2023)

• Electrical/ wiring issues:
  • Faulty TCC solenoid circuit (open or short to ground, damaged connector, corroded pins).
  • Damaged TCC solenoid, wiring harness, or connector at the transmission.
  • Faulty Transmission Control Module (TCM) or poor communication with the PCM (less common, but possible).
• Hydraulic/valve-body issues:
  • Worn or sticking TCC solenoid/valve body
  • Dirty or contaminated transmission fluid affecting valve body operation
  • Transmission fluid pump or pressure issues affecting TCC hydraulic circuit
• Fluid-related problems:
  • Low transmission fluid level
  • Burnt or degraded transmission fluid (oxidized color, burnt smell)
  • Contaminants in the fluid or improper fluid type
• Mechanical factors:
  • Worn torque converter components or mechanical binding
  • Internal transmission wear impacting the TCC circuit operation
• External/related concerns:
  • Faulty grounds or battery/ charging system causing weak signals
  • Intermittent electrical ground issues leading to sporadic code set

SYMPTOMS YOU MIGHT SEE WITH P0740

• Transmission does not reliably lock the torque converter (or locks/unlocks improperly)
• Harsh or delayed shifting, especially between gears
• Slipping or high engine RPM without corresponding speed change
• Engine light (MIL) on with P0740 and possibly related codes
• Transmission may enter a degraded or “limp” mode to protect itself
• Poor fuel economy or noticeable heat buildup in the transmission area
• Possible transmission fluid leaks or unusually dark/burnt fluid

DIAGNOSTIC STEPS (systematic approach)

Note: This is a general diagnostic workflow for P0740 on the CR-V’s 9-speed automatic. Work safely; transmission work often requires vehicle jacking and proper torque specs.

Step 1: Confirm and contextualize the code

• Use a capable OBD-II scan tool to confirm P0740 is stored or pending and note freeze-frame data (engine rpm, road speed, throttle position, transmission temperature) at the time of fault.
• Check for related transmission codes (P0741, P0742, P0743) and any P0700 (transmission control system malfunction) or P0750-series.

Step 2: Inspect transmission fluid health

• Check fluid level with the vehicle level on a warm, running engine (per Honda procedure).
• Inspect fluid color, smell, and consistency:
  • Fresh, reddish fluid is normal; burnt or very dark fluid, or fluid with a burnt odor, suggests overheating or contamination.
  • If fluid is low, inspect for leaks and top up with the correct Honda ATF if level is low.
• Check for metallic or sludge debris on the dipstick or fill cap (could indicate internal wear).

Step 3: Inspect electrical circuits for the TCC

• Visually inspect the TCC solenoid connector and related wiring at the transmission:
  • Look for damaged insulation, corrosion, bent pins, or loose connectors.
• Measure supply voltage and ground at the TCC solenoid circuit with a multimeter:
  • Confirm constant 12V supply when commanded (as applicable) and a solid ground when instructed by the service procedure.
• Check for battery voltage stability and charging system health; voltage drops can cause erratic solenoid operation.

Step 4: Check solenoid operation and hydraulics (without full teardown if possible)

• If your tool provides live data, monitor TCC solenoid duty cycle or PWM signal during a road test, especially as lockup is requested (steady cruise at highway speeds is typical test condition).
• If accessible, inspect the TCC solenoid for proper operation; a stuck solenoid or intermittent signal can trigger P0740.
• Evaluate transmission fluid temperature; overheating can cause TCC issues and misinterpretations in the ECU/TCM.

Step 5: Road test with data capture

• Take the vehicle on a test drive: at moderate highway speed, request lockup and observe whether the TCC engages cleanly and maintains lockup.
• Note any shifting anomalies, stall conditions, or abnormal transmission temperatures during this test.
• If the MIL is on, use the scan tool to check live data and confirm no other trans codes are competing with P0740.

Step 6: Consider hydraulic pressure/flow test (if you have the tools)

• If possible, measure transmission line/hydraulic pressures with a manual gauge to verify adequate pressure supply to the TCC circuit.
• Compare readings to Honda service data (specifications) if available; abnormal pressures point to valve-body or pump issues.

Step 7: Decide on repair path based on findings

• If fluid is old or contaminated: perform a transmission fluid and filter service (and possibly a pan cleaning) as a baseline.
• If the TCC solenoid circuit shows electrical fault: repair/replace the solenoid pack and fix wiring/connectors; re-check for codes.
• If pressure/valve-body issues are suspected: valve-body service or rebuild may be needed.
• If TCC mechanical integrity is in question or if recurring P0740 persists after other steps: torque converter replacement or transmission rebuild/overhaul could be considered.
• Remember: P0740 is a generic code; the actual fault could be electrical, hydraulic, or mechanical.

RELATED CODES

• P0741: Torque Converter Clutch Circuit Performance or Stuck Off
• P0742: Torque Converter Clutch Circuit Stuck On
• P0743: Torque Converter Clutch Circuit Electrical
• P0700: Transmission Control System Malfunction
• P0715: Input/Torque Converter Speed Sensor Malfunction (and related speed sensor codes)
• P0780 or other range codes may appear with transmission issues, but focus on P0740 family for TCC-related problems.

REPAIR OPTIONS AND COSTS (2025 price ranges)

Notes:

• Prices vary by region, shop rate, vehicle condition, and whether the transmission is still operable enough to road test.

• The figures below are generalized ranges for U.S. repairs and include parts and labor; taxes and shop fees not included.

• Transmission fluid service (drain/refill or flush with filter when applicable)

  • Parts: $0–$20 (ATF)
  • Labor: $80–$180
  • Total: roughly $150–$250

• TCC solenoid replacement (solenoid pack replacement or individual solenoid as needed)

  • Parts: $20–$150
  • Labor: $120–$350
  • Total: roughly $200–$500

• Valve body inspection/cleaning or replacement

  • Parts: $150–$500 (cleaning vs. replacement may vary)
  • Labor: $250–$900
  • Total: roughly $400–$1,400

• Torque converter replacement

  • Parts: $350–$900
  • Labor: $500–$1,800
  • Total: roughly $1,000–$2,700

• Transmission rebuild or major overhaul

  • Parts: $1,000–$3,000 (or more for fully rebuilt cores)
  • Labor: $1,000–$3,000
  • Total: roughly $2,000–$6,000

• Transmission replacement (new or remanufactured 9-speed unit)

  • Parts: $2,000–$4,500 (reman or new)
  • Labor: $1,500–$3,000
  • Total: roughly $3,500–$7,500

• Note: In many cases, addressing a P0740 on a CR-V may begin with fluid service and a TCC solenoid/valve-body-related repair, which are far less costly than a full torque converter or transmission replacement. If the issue is detected early and tackled promptly, cost can be significantly lower.

DIY vs PROFESSIONAL

• DIY suitability:
  • Basic steps you can perform at home (with proper tools): check and top up transmission fluid (if level is low), inspect for obvious wiring damage at the TCC solenoid connectors, and clear simple codes with an OBD-II scanner (though clearance and re-checks are needed after repair).
  • Moderate DIY scope: replacing the TCC solenoid or performing a transmission fluid/filter service is feasible for a mechanically experienced hobbyist with a decent toolbox, but it requires access to the undercarriage or transmission pan and familiarity with torque specs.
  • Advanced DIY scope: valve-body cleaning/rebuild, TCM/ECU software updates, hydraulic pressure tests, or torque converter replacement typically require specialized tools, alignment checks, and precise torque specs. These tasks are usually best left to a trained transmission technician.
• Professional considerations:
  • Pros: proper diagnosis, correct part matching, fluid compatibility, torque specs, witness tests, warranty coverage, and safer, more predictable outcomes.
  • Cons: higher upfront cost than DIY for some steps, but reduces risk of incorrect repair and potential repeat failures.
• Practical guidance:
  • If your CR-V is under warranty or you’re not comfortable with transmission work, start with a reputable shop that has experience with Honda transmissions.
  • If you’re technically skilled and equipped, begin with fluid condition assessment and TCC solenoid/electrical checks, then proceed to more complex repairs only if the simpler steps don’t resolve the issue.

PREVENTION

• Follow Honda’s recommended maintenance schedule for transmission service intervals and fluid type. Use the manufacturer-specified ATF (do not mix fluids unless the manual explicitly allows it).
• Regularly monitor transmission fluid level and condition; address leaks promptly.
• Avoid aggressive driving patterns that stress the torque converter (hard launches, sustained high-load acceleration).
• Maintain proper cooling for the transmission: ensure the radiator/con cooler system is functioning, especially if towing or carrying heavy loads.
• Address early symptoms promptly: delayed shifts, slipping, or unusual noises should prompt a diagnostic check before the issue escalates.
• Keep software up to date if Honda releases TCM/ECM/TCU updates relevant to transmission control (software updates are common in modern units to improve shift quality and clutch operation).

Data limitations and transparency

• The provided NHTSA data for 2017-2023 Honda CR-V shows no owner complaints and no recalls related to P0740 in this dataset. This means the guide reflects general diagnostic and repair knowledge rather than a documented field distribution for this specific model/year combination.
• Because P0740 is a transmission-control-related fault with multiple potential root causes (electrical, hydraulic, or mechanical), the exact fix should be confirmed by a qualified technician through testing and diagnosis.
• The repair cost ranges are 2025 estimates and can vary by region, vehicle condition, and labor rates. Use them as ballpark figures rather than exact quotes.

If you’d like, I can tailor this guide further to your exact CR-V trim, transmission type (9-speed automatic variant), mileage, and whether you’re facing specific symptoms or codes beyond P0740.