Service bulletins for the 2021 Nissan Titan
A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.
139 on file from NHTSA, as of 2026-10-19.
About U0101 on the 2021 Nissan Titan: what the code means, and the bulletins and recalls about the same components.
By type
By component
By trouble code
Only bulletins with trouble code: U0101 are shown. Show all
| NTB21-001B | 2022-10-14. Service bulletin. ELECTRICAL SYSTEM. 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. |
|---|---|
| NTB21-001 | 2021-02-06. Service bulletin. ENGINE AND ENGINE COOLING. 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. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.