One problem related to automatic transmission control module has been reported for the 2021 Acura TLX. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2021 Acura TLX based on all problems reported for the 2021 TLX.
On 07/01/2026, at approximately 8:00 am, during steady acceleration, flashing of mil with loss of power presented northbound after merging from 235 west bound to I-135 north bound near park city, KS. Particularly dangerous resulting in near rear end collision. Upon taking nearest exit ramp, attached bluedriver . Obd ii reader, and fault code p0303 - cylinder 3 misfire and u0401-68 pgm-fi/ecm/pcm system event code was logged, with multiple warning indicators that safety system, awd, brake, and other systems were disabled. Note, vehicle has had TSB 20-053 update w/ flash of pgm-fi which did not resolve the fault, fault associated with hot and humid climates or period of rain fall, apparent water vapor, condensate build up in intercooler. For Honda accord and Acura rdx w/ 4 cylinder 2. 0 tdgi engine TSB includes redesigned intercooler replacement, that is not available for Tlx 21-25 which is currently out of production. This has occurred previously during humid and hot weather, but no intermittent flashing mil does not store code. Thankful in this instance p0303 and u0401-68 code is stored, and scheduling service at dealership to diagnose misfire.
| Power Train problems | |
| Automatic Transmission Control Module problems |