Probably as soon as there is a "breach of the peace" (during the hookup).
If it is no longer your car (through default on the loan), you have no right to possess it or prevent its rightful owner from repossessing it.
Without quoting California Penal Code Section 31, elements that would directly make one a principal to a crime, would be the direct involvement to committing a crime, or the direct involvement to aiding or abetting a crime by advice, coercion or counsel whether or not they are actually present.

 The Elements: o Planning o Preparation o And Carrying out the offense
Forcible detainer is not classified as a crime in California. It is a civil matter related to the unlawful possession or occupation of property. It involves a legal process to regain possession of property from someone unlawfully occupying it.
"Preserve the integrity of the crime scene." This phrase emphasizes the importance of securing and protecting the area where a crime has occurred to ensure that evidence is not contaminated or tampered with, allowing for a thorough investigation to take place.
Yes, in California, verbally abusing another person can be considered a crime under certain circumstances. This may fall under harassment or hate speech laws, especially if the abuse is targeted at someone based on their protected characteristics such as race, religion, or gender. It's important to be mindful of the impact of your words on others and to communicate respectfully.
It is legal to own lock picks in California as long as you are not using them for criminal purposes. However, possessing lock picks with the intent to commit a crime, such as burglary or theft, is illegal.
As far as I know there is no statute of limitation on auto repossession in any state. Check with your state Attorney General to be sure. I will post a link for you to read. Repossession should be your last resort. Hiding a vehicle from repossession is a crime in some states. The consequences of repossession are always bad for you.
Suicide is not considered a crime in California.
Yes. It is a crime.
The eternal crime of not allowing the Holy Spirit work repentance (real contrition).
Yes, it is a crime, if the 'secured party' (the party who orders the repossession) has demanded the car be handed over to them, then it is a crime to conceal it. You do NOT have to have been informed of anything by the repossession agent themselves. The only notification is that the secured party wants the car back. If you were to conceal the car in these circumstances, then under the Texas Penal Code, you would be 'Hindering Secured Creditors' (Section 32.33). If the car is worth less than $1500, it is a misdemeanor of varying degrees. If the car is worth $1500 or more, then it is a felony, of increasing severity for higher values.
It would depend on the level of crime charged. For any crime that could get a life sentence, there is no limitation in California.
Crime is committed, and the numbers that measure it are collected, analyzed and become statistics.
it has been a crime as long as there were laws and territories.
Fight Crime
If you're supposed to surrendeer the vehicle and don't you can be reported for grand theft auto, which is a felony crime.
They can disconnect the trailer, but, if that trailer isn't included in the order for repossession, they cannot take it - doing so is theft, and a crime.
The statute for the crime of burglary.