HOW TO PROCEED WITH TROUBLESHOOTING HINT: This is a flowchart for vehicle pull. 
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Toyota Tundra Service Manual > Touch Select 2-4 And High-low System: Automatic Disconnecting Differential Motor Control Circuit High (P17A2)
DESCRIPTION This DTC is detected when a short to B+ is detected in the A.D.D. shift motor drive circuit. DTC Code DTC Detection Condition Diagnosis Condition Malfunction Status Malfunction Time Other Trouble Area P17A2 Ignition switch ON (when not switching between 2WD and 4H) Short to B+ in the A.D ...
