Infiniti Q70 Transmission Repair Chicago
Expert Infiniti Q70 transmission service in Chicago. Free computer diagnostic, lifetime warranty on rebuilds, all years.
Expert Infiniti Q70 transmission service in Chicago. Free computer diagnostic, lifetime warranty on rebuilds, all years.
2014–2019 (M-series successor): 7-speed automatic (7AT) rear-wheel drive or AWD; 3.7L V6 or 5.6L V8 Q70L: extended wheelbase version — same drivetrain AWD: ATTESA E-TS all-wheel drive with electronically-controlled torque split Production ended 2019
Q70 7AT diagnosis requires Infiniti Consult III. Solenoid circuit E is the most common fault code — valve body replacement is the primary repair. V6 torque converter shudder: fluid replacement (Matic K) first, then torque converter if persistent. V8 overheating: cooler flow check and fluid condition assessment. ATTESA coupler: fluid service first, coupler replacement for confirmed mechanical failure. Cold-start engagement delay typically resolves with valve body servicing. The Q70 V8 generates more heat than V6 — more frequent fluid changes recommended at 35,000 miles for V8 models.
Nissan Matic K ATF (2014–2017) or Matic S (2018–2019); approximately 9–10 quarts; ATTESA transfer case: Nissan-specified gear oil
Fluid service: same day; valve body/solenoid: 1–2 days; torque converter: 2–3 days; ATTESA service: same day; full rebuild: 4–6 days
"Honest diagnosis, fair price, and the repair was done right. Chicago Transmission has been my go-to for years. Wouldn't trust anyone else with my car."
"The free diagnostic alone was worth the trip. They found the problem fast, gave me a written estimate, and completed the work on time. Exceptional service."
"Family owned and it shows. They treated my car like it was their own. The lifetime warranty on my rebuild gives me total peace of mind. Highly recommend."
Yes — the Q70 is the renamed Infiniti M-series. The M37 became Q70 3.7, and the M56 became Q70 5.6 (essentially). The drivetrain is identical between the M-series and Q70 of the same engine.
The RE7R01A 7AT is a durable unit. The main vulnerabilities are solenoid circuit E failure (well-documented) and torque converter shudder (fluid-related). With proper Matic K/S fluid maintenance, Q70 transmissions routinely reach 150,000+ miles.
Yes — the 5.6L V8 generates more heat than the 3.7L V6. We recommend fluid changes every 35,000 miles for V8 models vs. 40,000–45,000 for V6 models.
Yes — we stock RE7R01A rebuild kits and keep Matic K/S ATF in stock. Full rebuilds take 4–6 days with a 3-year/36,000-mile warranty.
Solenoid E is one of the shift solenoids in the valve body. Circuit faults indicate resistance or signal issues — either the solenoid itself has failed or there's a wiring issue. Valve body replacement is the standard repair when the solenoid itself has failed electrically.
Same-day appointments available. Honest estimates, no surprises. We've been doing this since 1987.
