U0101 on the 2021 Nissan Titan
The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.
Nobody has written a description of this code yet.
| NTB21-001B | 2022-10-14. Service bulletin. TCM COMMUNICATION ERROR CAUSING A NO START CONDITION SERVICE INFORMATION If a customer states the engine will not crank and will not start (may be intermittent) and DTC U0101 (Lost Comm TCM) is stored in the ECU (ENGINE), and/or stored in the SCU (SHIFT) as PAST or CURRENT, OR The TCM shows as “UNKWN” in the PRESENT column, or “0” in the PAST column, under the CAN DIAG SUPPORT MNTR tab in the ECU or SCU in C-III plus. • Please check Service COMM or Dealer Business Systems (DBS) National Service History to confirm if campaign R22B1 or R22A9 has been applied. 1. Has campaign R22B1 or R22A9 already been completed? No: Complete the related campaign bulletin. Yes: Proceed to step 2. 2. Refer to the ESM for further diagnostic information not covered by this bulletin. NOTE: If the Park indicator is not displayed in the Driver Information Center (Figure 1) and C-III plus does not display the current TCM part number after a 2 minute wait with the ignition ON, engine OFF, this TSB does not apply. Refer to the ESM for further diagnostic information. This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin. |
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| NTB21-001 | 2021-02-06. Service bulletin. 2020-2021 TITAN/TITAN XD; TCM COMMUNICATION ERROR CAUSING A NO START CONDITION IF YOU CONFIRM The customer states the engine will not crank and will not start. (The incident may be intermittent.) And There is a U0101 DTC (Lost Comm TCM) in the Engine Control Unit (ECU) and/or the Shifter Control Unit (SCU). This DTC may be in a PAST or CURRENT status. Or The TCM shows “UNKWN” in the PRESENT column or “0” in the PAST column under the CAN DIAG SUPPORT MNTR tab within the ECU (ENGINE) or the SCU (SHIFT) in CONSULT-III PLUS (C-III plus). See Figure 1 and Figure 2. |
2 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.