I cannot. (In fact, I have no clue what EAP means, so take what I say with a healthy dose of salt.)
California's general rule for assessing sales tax is that any purchase of tangible personal property (with the customary exceptions for food and prescriptions, etc.) is subject to sales tax. Purchases of software that is received via the internet (only) are exempt as this is considered intangible personal property. Purchases of software on a hard medium is considered tangible personal property and is subject to tax.
In addition, items that are included in a package that have hardware and software components are charged sales tax on the entire purchase price, even if the software is listed and priced separately. I believe (unconfirmed however) that the BOE considers the components as one item because the hardware will not operate without the software.
But it has been a long time since I have had to battle with our friends at the BOE, and it was never regarding software.
Short answer: if this EAP is a stand-alone, software only (like buying TurboTax online) function, then my guess is that it is exempt from sales tax. If the software determines what other taxable components of the car can and cannot do, then my guess is that it would be taxable.
But I am prepared to be wrong.