I have a 2012 Nissan Altima 2.5 S. Its my daily driver. It has 130K no major issues ever. It has a 8 TCM codes. car works fine and all, no lack of acceleration, power, no slipping, other than when the fluids are cold tends to be on the slow acceleration side. Since new at about 35K it had a one time sound in cold mornings (a light click, or if something unclogged) that i believe comes from the driver side. It goes away comes back its abnormal. no engine light on for these codes, they are just stored within the system, which leads me to believe that these issues happened within my ownership, never noticed them i guess. I heard that it could be as simple as a faulty transmission ground, or sensors, yet i don't feel a thing. Maybe because my commute is 20 miles for a total 40 a day. I have done CVT fluid changes.
in conclusion car drives fine, its 8 years old and mpg is not affected 25-26 avg. yet it has these 8 codes. They say if is not broke don't fix it, im just looking to prevent damage
P0725
U1000
P0705
P1722
P0744
P0826
P1701
P0868
Wow. I don't know about these codes but I am suprised that the transmission is still going Nissan made the worst transmissions around 2012/2013, and they were notorious for transmission issues.
I looked up some codes and found that
U1000 - Engine control unit has lost communication and control of transmission control module (typical on Nissans)
"The P0725 code is a generic OBD-II trouble code that notes a problem with the engine speed input circuit. The engine input speed sensor is responsible for sending a signal about the engine's speed to the powertrain control module (PCM)."
The vehicle speed signal is transmitted from the Anti-Lock Brake System (ABS) actuator and electric unit (control unit) to Transmission Control Module (TCM) via Control Area Network (CAN) communication line"
P0744 NISSAN Possible Causes
- Faulty torque converter clutch solenoid valve
- Torque converter clutch solenoid valve harness is open or shorted
- Torque converter clutch solenoid valve circuit poor electrical connection
- Low transmission fluid level
- Dirty transmission fluid"
"A manually shiftable automatic transmission or automated manual transmission, has to be able to communicate with the engine computer so it knows how to setup the engine for optimum performance and efficiency. A P0826 DTC means that there is a problem with the circuit the up and down switch operates."
"P1701 NISSAN Possible Causes What does this mean?
-Faulty Transmission Control Module (TCM)
-Transmission Control Module harness is open or shorted
-Transmission Control Module circuit poor electrical connection"
Transmission fluid pressure is essential to the operation of your gearbox. The transmission fluid pressure sensor tells the ECU how much fluid pressure is available at all times. If it detects that there is not enough, the ECU will store a P0868 DTC.
Hope this helps! All in all, the transmission is falling apart.
I would get rid of the car before the transmission goes out which is very soon. It will be worth nothing when the tranny goes out so trade it in or sell it or get it off of your hands.
Conclusion: Signals to your transmission via TCM and ECM are disrupted and you have codes all directly linked with the transmission, which is know to fail around 120k miles.
car has a totaled title it's worth literally nothing, I will drive it until the wheels fall off yet i'm planning on keep doing basic maintenance such as engine and cvt fluid change. then I am selling it to a junkyard
honestly i think that all these codes are as simple as faulty ground, because "mechanically" i feel nothing.
I see. You in in shark infested waters my friend. 130k miles. Good luck though!