OishiiJPN

Moderator
Staff member
Please see T-SB-0045-21

Applicability:

2020-2021 Toyota Tacoma
VDS(s): CZ5AN, DZ5BN, SZ5AN Transmission(s): AUTOMATIC
(Please see this Post to determine VDS and WMI's)


Introduction:
On 2020 – 2021 model year Tacoma TRD Pro and TRD Off-road (4WD) vehicles equipped with Crawl Control, the Crawl Control feature may exhibit reduced functionality under some conditions. Customers may experience normal functionality on a flat or mildly inclined and smooth slope. However, the Crawl Control feature could deactivate when the system detects high torque demand seen in more traditional off-road scenarios such as a steep incline or difficult terrain. In this scenario the feature will hold the vehicle stationary for 5 – 10 seconds, then simultaneously deactivate and display the message “Crawl has been disengaged” on the MID (Multi-Information Display).

The Engine Control Module (ECM) (SAE term: Powertrain Control Module/PCM) logic has been modified to remedy this condition. Follow the Repair Procedure in this bulletin to address this condition.

APPLICABLE WARRANTY:
This repair is covered under the Toyota Federal Emission Warranty. This warranty is in effect for 96 months or 80,000 miles, whichever occurs first, from the vehicle’s in-service date. Warranty application is limited to occurrence of the specified condition described in this bulletin


Repair Procedure:
1. Confirm the condition exists. Does the vehicle’s Crawl Control feature exhibit reduced functionality under the conditions described in the introduction?
YES — Continue to step 2.
NO — This bulletin does NOT apply. Continue diagnosis using the applicable Repair Manual.

2. Use Techstream to confirm if the ECM (PCM) calibration has been updated and check for the Authorized Modifications Label affixed to the vehicle in the location shown below. Is the calibration ID listed in Techstream and on the label the latest ECM (PCM) calibration?
YES — This bulletin does NOT apply. Continue diagnosis using the applicable Repair Manual.
NO — Continue to step 3.

Old Calibration ID's for 2020... (896650410000, 8966304B800, 8966304B100)
New Calibration ID's for 2020... (896650410100, 8966304B8200)

Old Calibration ID's for 2021... (8966304C2000)
New Calibration ID's for 2021... (8966304C2100)

3. Flash reprogram the ECM (PCM)

4. Prepare and install the Authorized Modifications Label

5. Test-drive the vehicle to confirm proper operation.
 
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