The thrilling tale begins with a robbery where the driver dramatically unveils himself as Castillo, an undercover FBI agent, who swiftly apprehends the criminal responsible for his partner's untimely death years earlier. Meanwhile, we meet the determined Jon Baker, portrayed by Dax Shepard, who, despite being an older rookie motorcycle officer at the California Highway Patrol, is poised to graduate under probation. Once a celebrated freestyle motocross racer whose career was marred by injuries and a painful separation from his wife due to dwindling sponsorships, Baker now navigates life on a strict painkiller regimen while residing in a guest house.
As fate intertwines their lives, the undercover FBI agent, now known as Frank (Ponch) Poncherello, played by Michael Peña, is deployed to the CHP following a brazen armored car heist that reveals a network of corrupt officers within the department. With the armored car's route compromised by a police car, Ponch teams up with the inexperienced Baker, given that Baker's motorcycle skills might provide them with an edge in their undercover efforts.
Adapting to Baker's rampant enthusiasm is no easy feat for Ponch, especially as Baker relentlessly hands out tickets for minor infractions while striving to remain in the top tier of his class. Their strained partnership is fraught with tension as Ponch tries to keep a low profile amidst Baker's incessant meddling.
The plot thickens as we uncover the mastermind behind the corruption, Lieutenant Ray Kurtz (played by Vincent D'Onofrio), who is funneling money from armored cars to finance his drug-addicted son’s escape from Los Angeles. Tensions spill over when Ponch and Baker argue over Baker's suspicions regarding his wife's fidelity while Baker, in turn, dispenses unsolicited advice about Ponch's so-called sex addiction. This sparks a series of escalating confrontations culminating in Baker saving Ponch's life during a critical moment as they chase down robbery suspects.
In a twist of irony, Baker's condition deteriorates, leading to a heart-to-heart with Ponch where he learns of Ponch's true identity as an FBI agent involved in the investigation of the robberies. Together, they delve deeper, interviewing the widow of a dead police chopper pilot, uncovering unexpected layers of deception, leading them to suspect the robberies stem from within the CHP.
The intensity reaches a breaking point when they attempt to follow leads linking Lt. Kurtz to the crime, only for Ponch to find himself dismissed from the FBI after a high-stakes chase ends tragically. Baker suffers grave injuries, and a stark reality sets in as his wife neglects to visit him during his recovery, ultimately selling their home without his consent.
Despite the upheaval, Baker's determination shines through as he vows to bring justice by taking an oath with the CHP, even when his wife’s actions weigh heavily on him. The duo embarks on a perilous mission to rescue Baker’s wife, who has been kidnapped by Kurtz himself. A tantalizing game of cat and mouse unfolds, but together, with sharp resolve, they confront and dismantle the gang of crooked officers, culminating in a gripping showdown that sees Kurtz finally brought to justice. In the end, Ponch decides to continue his journey with the CHP, reaffirming their bond forged through chaos and courage.
