Why does my GMC Acadia keep saying 'Shift to Park'?

Short answer: It's a common fault in the Acadia's shifter park switch and wiring. GM has a service bulletin fix, and dealers may replace the switch, harness or whole shifter. Owners paid about $650-$1,500 out of warranty. Clicking the shifter button or waiting a few seconds in Park can clear it for now.

Symptom: 'Shift to Park' shows even in Park, the car stays in accessory mode and won't turn off, it beeps constantly, the battery dies overnight, or the electronic parking brake won't release on a dead battery.

What to check first

1. Make sure the shifter is fully in Park, then press the shifter button a couple of times.
2. Confirm the car is actually off before walking away.
3. Ask the dealer about GM's service bulletin and your warranty coverage.
4. If the fix comes back, ask for the updated switch or shifter, not just the jumper harness.
5. Test or charge the battery if it's been drained.

Likely causes

1. Faulty park micro switch in the shifter. A tiny switch in the shifter tells the Acadia it's in Park. When it fails, the car thinks it's still in gear, so it won't fully shut off and can drain the battery.
2. Shifter wiring harness. GM's service bulletin fix adds a jumper wire harness. Some owners needed a new switch or whole shifter after that.

What it usually costs

Owners paid $650, about $700 with a $180 diagnosis, about $1,000 and up to $1,500. Others got it free under warranty.

Is it safe to keep driving?

Yes to drive, but it can leave the car on and drain the battery, so you could be stranded. Make sure it's in Park and off before leaving it.

DIY or shop?

Some owners did a paper clip bypass at the switch connector from a video. That changes how the car detects Park, so have a pro look at it. Most use the dealer.

Recalls, bulletins and complaints in plain words

• Recalls: NHTSA lists 18 recall(s) for the GMC Acadia in these years, and none is for this problem. Recall 20V668000 covers a start/stop accumulator endcap on some of these Acadias, which is a different problem. Check your VIN at nhtsa.gov/recalls. If your car is part of a recall, the dealer fixes it for free.
• Plain words: The complaint count below shows how often owners reported problems that mention these words to NHTSA. A count is not proof of a defect.
• NHTSA complaints: 1075 keyword-matched complaints for GMC Acadia 2017–2023 (of 1858 unique complaints queried, NHTSA complaints API by model year, queried 2026-11-04; keywords: shift to park, park, shifter, won t (turn, shut) off, battery, dead). This counts complaints that mention these words. It is not a defect finding.

What owners report

• In 2019 GMC Acadia - Shift to Park on Reddit r/GMCACADIA, a 2019 Acadia owner's 'Shift to Park' message came back after a dealer fix. Owners linked a video fix with a paper clip on the shifter switch connector, and one owner said the car stayed in accessory mode and drained the battery so the electronic parking brake wouldn't release. Owners paid $650 and about $700 including a $180 diagnostic fee.
• In Shift to Park error message on Reddit r/GMCACADIA, a 2019 Acadia owner said the dealer did the service bulletin work but the message came back. A 2018 owner went back three times: first a whole new shifter, then a wire harness per the bulletin, then an improved shifter and harness, which fixed it.
• In Shift to park on Reddit r/GMCACADIA, an Acadia owner who travels for work had to leave the car running for 12 hours because it wouldn't recognize Park, or the battery would die. They paid about $1,000 out of pocket, and another owner said the dealer told them it's common and the latest bulletin changes the micro switch and shifter wiring.
• In Shift to Park issue on Reddit r/GMCACADIA, a 2019 Acadia Denali owner's car beeped about not being in Park about 10% of the time. A 2018 owner had the shifter replaced twice under warranty, a 2019 owner said the bulletin jumper wire didn't help but a new micro switch and wiring did, and one owner said idling 15-20 seconds in Park before shutting off avoided it.
• In 2018 GMC Arcadia shift to park on Reddit r/GMCACADIA, a 2018 Acadia owner had it fixed free when the car was new, and it came back three years later, a month after the extended warranty ran out.

Quick tip

Get the bulletin fix, and push for the updated switch or shifter if it returns.

Vehicle focus: GMC Acadia, 2017-2023 (second generation). Chevy Traverse and other GM models have the same issue.

Safety / mechanic note

Never leave the vehicle unless it's truly in Park and off. Verify with a mechanic.