2016 Auto Club 400

Auto Club Speedway, the track where the race was held.

Auto Club Speedway (formerly California Speedway) is a 2 miles (3.2 km), low-banked, D-shaped oval superspeedway in Fontana, California which has hosted NASCAR racing annually since 1997. It is also used for open wheel racing events. The racetrack is located near the former locations of Ontario Motor Speedway and Riverside International Raceway. The track is owned and operated by International Speedway Corporation and is the only track owned by ISC to have naming rights sold. The speedway is served by the nearby Interstate 10 and Interstate 15 freeways as well as a Metrolink station located behind the backstretch.

Austin Dillon was the fastest in the first practice session with a time of 38.194 and a speed of 188.511 mph (303.379 km/h).[14]

Carl Edwards was the fastest in the second practice session with a time of 38.317 and a speed of 187.906 mph (302.405 km/h).[20] Kurt Busch went to a backup car after slamming the wall in turn 3.[21] Because this took place after qualifying, he'll start the race from the rear of the field.[21]

Matt Kenseth was the fastest in the final practice session with a time of 38.831 and a speed of 185.419 mph (298.403 km/h).[22] Greg Biffle and Kyle Larson made contact with each other exiting turn 4.[23] Larson went to a backup car and will start from the rear of the field.[23]

Jimmie Johnson won the race.

Under clear California skies, Austin Dillon led the field to the green flag at 3:49 p.m. He was passed going into turn 1 for the lead by Kevin Harvick. After five laps, Dillon fell back to third. Carl Edwards made a charge at Harvick, but he failed to make the pass. By lap 17, Harvick's gap grew to two seconds over Edwards. Kyle Busch was running fifth when he made an unscheduled stop for a flat right-rear tire on lap 20. He rejoined the race in 37th one-lap down. The first caution of the race flew on lap 27 for a single-car wreck in turn 2. Riding the high line, Chris Buescher suffered a right-rear tire blowout and made contact with the wall. Edwards exited pit road with the race lead. Greg Biffle, Kurt Busch and Kasey Kahne were tagged for their crews being over the wall too soon and restarted the race from the tail-end of the field.

The race restarted on lap 32. Harvick got a run on Edwards going down the backstretch to retake the lead on lap 35. Coming to the lead, Edwards took back the lead on lap 36. Going into turn 1, Harvick drove underneath Edwards to retake the lead on lap 38. The second caution of the race flew on lap 47 for a single-car wreck on the backstretch. Exiting turn 2, Kyle Larson cut down his left-rear tire, hit the outside wall, turned down the track and slammed the inside wall head-on.[24] He said that he "was going down the back stretch and I think it was my left-rear tire got cut. It must have ripped the brake line because I went to push the pedal and it went straight to the floor board. I couldn’t slow down. It was definitely a hard hit there, probably one of the harder ones of my career. Even before that we were pretty sub-average there, we were pretty bad. Disappointed in our run today, but glad I’m alright. It was really good for about 20 laps on each run. The take-off speed was awesome and I don’t know I just couldn’t get the thing to last for a whole run. We just kind of struggled there at the end of each run, that kind of hurt us, but short-run speed that was a lot of fun. I thought we were as competitive as anybody on short-run speed. We just needed something there for the last 10 to 15 laps. We will work on it. The pit crew was awesome. They bounced back with great stops all day.”[24] He would go on to finish 39th.[25] Brad Keselowski was tagged for an uncontrolled tire and restarted the race from the tail-end of the field.

The race restarted on lap 54. Harvick made an unscheduled stop from the lead on lap 71 for a vibration. Martin Truex Jr. assumed the lead while Harvick rejoined the race in 33rd. A. J. Allmendinger also pitted from 10th for a vibration. Jimmie Johnson took the lead from Truex on lap 78. He hit pit road on lap 84 and handed the lead to teammate Chase Elliott. He pitted the next lap and handed the lead to Matt Kenseth. He pitted the next lap and the lead cycled to Harvick. Denny Hamlin and Paul Menard were tagged for speeding and were forced to serve pass-through penalty's. Matt DiBenedetto was tagged for removing equipment from his pit box and was forced to serve a pass-through penalty.

Harvick pitted from the lead on lap 106 and handed the lead to Johnson. The third caution of the race flew on lap 108 for a single-car wreck in turn 2. Round the turn, Trevor Bayne got too close to the wall and rode it. Harvick opted not to pit under the caution and assumed the lead from Johnson. Clint Bowyer was tagged for his crew being over the wall too soon and restarted the race from the tail-end of the field.

The race restarted on lap 115. Harvick on older tires was no match for Johnson on new tires as the latter took the lead with 85 laps to go. The fourth caution of the race flew with 79 laps to go for a single-car wreck in turn 1. Going into the turn, Danica Patrick got hooked into the wall by Kahne and slammed the wall head-on.[26] She walked towards the racing surface to show her displeasure towards Kahne.[26] She said afterwards that she "saw him chase me down the track, and the next thing I know I was getting spun up the track. We had a restart and I was low on him, and if you go high it’ll drag you both back so I was going low. I was passing him. He was behind me on the right rear end. I don’t know what kind of day he was having – I heard he was a lap down – and I feel bad if he felt he was put in a position and got desperate there. He must’ve been having a very rough time. I was looking forward to a good finish but unfortunately it wasn’t meant to be."[26] She, Kahne, and his crew chief, Keith Rodden, were called to the NASCAR hauler after the race. Johnson and Truex swapped the lead on pit road. The latter excited pit road with the lead. Biffle and Edwards were tagged for speeding and restarted the race from the tail-end of the field.

The race restarted with 70 laps to go. Harvick got a run on the outside line exiting turn 4 to retake the lead with 63 laps to go. Kenseth made an unscheduled stop with 52 laps to go for a flat tire. To add insult to injury, he was tagged for speeding and was forced to serve a pass-through penalty. Dale Earnhardt Jr. and Johnson pitted with 46 laps to go. Debris in turn 3 brought out the fifth caution of the race with 45 laps to go. Johnson opted to stay out when Harvick pitted and assumed the lead. Truex was tagged for speeding and restarted the race from the tail-end of the field.

The race restarted with 40 laps to go. Edwards outdrove Johnson to the line to retake the lead with 39 laps to go. Johnson drove under him in turn 1 to retake the lead with 38 laps to go. Joey Logano drove under Johnson in turn 2 to take the lead with 36 laps to go. Harvick outdrove Logano to the line to retake the lead with 34 laps to go. Driving down the backstretch, Harvick nudged Logano's rear to retain the lead with 33 laps to go. With 14 laps to go, Logano took the air off Truex's car going into turn 1 and sent him into the wall.[27] This would lead to Truex cutting a tire down, making an unscheduled stop and finishing 32nd.[27] Logano said after the race that he had "no excuse besides it was just racing. I tried to go underneath him and fake that and then go back to the top, and I think he was going to go to the top as well. We never touched, but I was right on him, and when you're going that fast and you take the air off the spoilers, the cars get uncontrollable. So I hate that I hurt his day, for sure."[27] The sixth caution of the race flew with two laps to go for a single-car wreck in turn 4. Kyle Busch made contact with the wall and had a tire coming apart. Hamlin exited pit road with the race lead. Kenseth was tagged for an uncontrolled tire and restarted the race from the tail-end of the field.

The race restarted with two laps to go. Johnson drove by Hamlin and Harvick to score the victory.[28]

Speaking on the final restart, Johnson said he "got a great run off of Turn 2 and I thought ‘man I’ve got a shot at this thing’. Which I didn't expect to have, Harvick has been so fast. I cleared him and kind of got away. We saved our best for last for sure. We had our best at the last there and really strong on the short run which wasn't necessarily our strong suit earlier in the day. Chad (Knaus, crew chief) made some great adjustments there to get me tuned up for that dash at the end.”[29]

Harvick said after the race that the final restart "was the worst it has taken off on restarts, but we weren’t very good on restarts for four or five laps unless we were all by ourselves. The No. 48 was able to hang with us and we just weren’t able to drive it in like I needed to.”[30]

On the Thursday after the race, Danica Patrick was fined $20,000 for walking up towards the racing surface to show her displeasure to Kahne which led to her being placed on probation as well.[31] In addition, six teams were issued warnings for failing tech inspection multiple times.[32]

• Lead changes: 29
• Cautions/Laps: 6 for 13
• Red flags: 0
• Time of race: 2 hours, 59 minutes and 17 seconds
• Average speed: 137.213 miles per hour (220.823 km/h)

The race was sixteenth race Fox Sports covered at the Auto Club Speedway. Mike Joy, three-time Auto Club winner Jeff Gordon and Darrell Waltrip had call in the booth for the race. Jamie Little, Chris Neville and Matt Yocum handled the pit road duties for the television side.

MRN had the radio call for the race which was also simulcasted on Sirius XM NASCAR Radio. Joe Moore, Jeff Striegle and 2001 race winner Rusty Wallace called the race from the booth when the field was racing down the front stretch. Dan Hubbard called race from a billboard outside turn 2 when the field was racing through turns 1 and 2. Kurt Becker called the race from a billboard outside turn 3 when the field was racing through turns 3 and 4. Alex Hayden, Winston Kelley and Steve Post worked pit road for MRN.