Shift-to-Park warnings and recall 20V668 plague 2018-2023 Traverse. Learn your California lemon law rights and see if you qualify.
You bought a midsize family SUV — three rows, plenty of cargo room, and a reputation for solid everyday utility. What you may not have signed up for is a dashboard that insists your Traverse isn't in Park when it clearly is, or a sudden pool of transmission fluid spreading across your driveway. For 2018-2023 Chevrolet Traverse owners, those two complaints land near the top of every reliability survey and NHTSA complaint database. The 'Shift to Park' message is so common that GM revised the fix at least three times across the production run — first in 2019, again in 2021, and again in March 2024 — yet dealers still see fresh Traverse owners walking in with the same symptom. The accumulator bolt recall (NHTSA 20V668) is less visible but arguably more dangerous: missing bolts on the start/stop accumulator endcap can allow transmission fluid to leak, and GM's own recall language warns that fluid contacting an ignition source increases the risk of fire. Across the 2018-2023 generation, owners also documented exhaust flex-pipe bracket failures, TCM software faults that trap the transmission in first gear, and multiple airbag-related safety recalls. If your Traverse has been back to the dealer more than once for any of these problems without a lasting fix, California's Song-Beverly Consumer Warranty Act may give you more leverage than you realize.
The issues owners report most, ranked by severity — each one verified against a cited NHTSA source.
Transmission fluid leaking underneath vehicle; sudden loss of drive power while underway; burning fluid smell; check engine or transmission warning lights.
Check engine light on; vehicle stuck in 1st gear or reverse only; cannot shift above ~25 mph; abrupt or delayed gear changes; DTC P2731 stored.
Dashboard displays 'Action Required: Shift to Park' message even though vehicle is already in Park; vehicle may not shut down; door locks may not engage; battery drain from extended ignition-on state.
Loud exhaust rattle or ticking noise; check engine light with lean fuel mixture codes (P0171/P0174) or catalytic converter efficiency codes; repeated catalytic converter failure; exhaust smell in cabin.
No visible driving symptom; curtain airbag may fail to deploy or deploy with reduced effectiveness in a side-impact or rollover crash.
Engine stalls unexpectedly while driving; reduced power; vehicle may not restart; no warning prior to stall.
A settled Margarian Law case on this exact model, published with the actual settlement math.
Open any defect for the symptoms and why it matters for a California lemon-law claim. Each is tied to a cited NHTSA source.
Transmission fluid leaking underneath vehicle; sudden loss of drive power while underway; burning fluid smell; check engine or transmission warning lights.
Safety recall with fire and propulsion-loss hazard covering all 2018-2020 Traverse. Repeated dealer visits for recurring fluid leaks or failed accumulator repairs, combined with a propulsion loss complaint, support a substantial-impairment lemon claim.
Dealer inspects and replaces the start/stop accumulator endcap assembly at no charge under NHTSA recall 20V668.
Check engine light on; vehicle stuck in 1st gear or reverse only; cannot shift above ~25 mph; abrupt or delayed gear changes; DTC P2731 stored.
Repeated dealer visits for TCM reprogramming that fails to permanently resolve the stuck-in-gear condition strengthen a lemon claim. Drivability impairment is substantial.
TCM reprogramming per GM TSB 18-NA-121 (updated March 2020). Service Fast Learn procedure required after programming.
Dashboard displays 'Action Required: Shift to Park' message even though vehicle is already in Park; vehicle may not shut down; door locks may not engage; battery drain from extended ignition-on state.
One of the highest-volume Traverse complaints across MY 2018-2022. Multiple TSB revisions (2019, 2021, 2024) confirm ongoing OEM acknowledgement. Repeated repair attempts without resolution are a textbook lemon-law pattern.
Install new shifter harness and in-line jumper harness (GM Part No. 84733196) per TSB 19-NA-206. Repeat repairs may require full shift control assembly replacement.
Loud exhaust rattle or ticking noise; check engine light with lean fuel mixture codes (P0171/P0174) or catalytic converter efficiency codes; repeated catalytic converter failure; exhaust smell in cabin.
GM's own Special Coverage programs for 2019 and 2021 MY confirm the defect is OEM-acknowledged. Owners of 2018, 2020, and 2022 MY vehicles with the identical design are denied coverage — a strong factual basis for repair-cost disputes and lemon claims if within the coverage window.
Exhaust pipe bracket repair or replacement per GM PIP5681C. GM issued Special Coverage programs (15 years/150,000 miles) for 2019 MY (N212356540) and 2021 MY (N222385510); 2018 and 2020-2022 owners must pursue cost recovery through other channels.
No visible driving symptom; curtain airbag may fail to deploy or deploy with reduced effectiveness in a side-impact or rollover crash.
Safety-critical latent defect. If recall remedy was performed incorrectly or required multiple attempts, this supports a substantial-impairment argument.
Dealer replaces suspect roof-rail airbag modules under NHTSA recall 20V446 at no charge.
Engine stalls unexpectedly while driving; reduced power; vehicle may not restart; no warning prior to stall.
Stall-without-warning is a classic safety-based lemon trigger. Repeated stalls before recall remedy is applied, or failed first repair attempt, directly supports a lemon claim.
Dealer replaces the fuel pump module under NHTSA recall 20V639 at no charge.
Sudden loss of drive power while moving; vehicle unable to maintain park on a slope; grinding noise from front drivetrain; DTC(s) related to transmission.
Propulsion loss and rollaway risk is a top-tier safety defect. Any owner who experienced loss of drive or rollaway before remedy has a strong lemon claim regardless of mileage.
Dealer replaces transmission sun gear under NHTSA recall 23V172 at no charge.
No visible driving symptom under normal use; structural integrity compromised; may be detected during dealer inspection.
A cracked frame that qualifies for vehicle replacement is among the strongest structural defects for a lemon claim — the vehicle was effectively unfit for ordinary use from delivery.
Dealer inspects; vehicle is replaced if frame crack is confirmed, under NHTSA recall 19V643 at no charge.
closed
Transmission built with dimensionally incorrect sun gear, causing driver-side half-shaft disengagement, resulting in loss of propulsion and/or loss of mechanical park.
closed
Left-side half-shaft assemblies may be missing a retaining ring, which can cause the half-shaft inner joint to separate, resulting in loss of drive power or vehicle rollaway in park.
closed
Roof rail airbag harness connector may have incompatible electrical terminals (installed during offline factory service), preventing airbag deployment.
closed
Side curtain air bags may not be properly attached due to improperly installed weld nuts, preventing intended deployment.
closed
Missing bolts on the start/stop accumulator endcap may result in a transmission oil leak, which can progress to loss of propulsion and, in the presence of an ignition source, risk of fire.
closed
Fuel pump jet nozzle may have a manufacturing plastic burr blocking fuel flow, causing insufficient fuel supply to the engine.
closed
Roof-rail airbag inflator diffuser may not have been properly crimped to the inflator and could separate during deployment, degrading airbag performance.
closed
Right-hand frame rail in the engine compartment may be cracked due to incorrect stamping die configuration, reducing crash performance.
closed
Sensing Diagnostic Module may not have been switched out of manufacturing mode at the assembly plant, preventing airbag deployment in a crash.
Every item below comes from this vehicle's documented defects. The more you recognize, the more a free case review is worth your time.
California's Song-Beverly Consumer Warranty Act — commonly called the lemon law — requires a manufacturer to replace your vehicle or buy it back if a defect covered by the manufacturer's warranty substantially impairs the use, value, or safety of the vehicle and cannot be repaired after a reasonable number of attempts.
What 'reasonable number of attempts' means depends on the defect. For safety-related issues — like a transmission fluid leak that creates a fire risk — California law creates a rebuttable presumption that two attempts are enough. For other serious defects, the general presumption kicks in after four repair attempts, or after the vehicle has been out of service for more than 30 cumulative days within the first 18 months or 18,000 miles.
The recall on the transmission accumulator bolts (20V668) covers 2018-2020 Traverse vehicles. If your vehicle experienced propulsion loss, repeated fluid leaks, or the recall remedy did not hold, those documented repair visits may count toward your lemon law repair attempts.
Keep every repair order, every recall notice, and every written communication with the dealer and GM customer service. If you may qualify, speaking with a California lemon law attorney is a good first step — many offer free consultations and handle cases on a contingency fee basis, meaning the manufacturer typically pays attorney fees if you prevail.
“Could not duplicate” doesn't mean the defect isn't real. Here's exactly what to do to protect a potential California lemon-law claim.
Document the moment it happens. Photos, video, and screenshots of any warning lights — with the date and the mileage.
Get a repair order every visit — even “found nothing.” That paperwork is the foundation of a claim.
Check your VIN at nhtsa.gov/recalls. Note any recall that has no available remedy yet.
Track your out-of-service days. California law counts the cumulative days your vehicle spends in the shop.
Keep loaner & rental records. Alternate-transport paperwork during long repairs matters.
Save everything in one place. Symptoms, dates, repair orders, and every repeat visit — the intermittent ones especially.
The 'Shift to Park' message and transmission fluid leaks are the two Traverse issues most likely to trigger a cannot-duplicate response from a dealer, because both can be intermittent. Here is what to do before and after every service visit:
Document every occurrence. When the 'Shift to Park' message appears, take a photo or video with the date-and-time stamp visible and the shifter position clearly in frame. Note the outside temperature, how long the vehicle had been running, and whether the doors locked normally.
For transmission fluid leaks, photograph the puddle on the ground immediately, with something in frame for scale. Save any shop rags or towels that show the fluid color and smell.
Ask for a written repair order every visit — even when the dealer finds nothing. A repair order that says 'verified customer concern, unable to duplicate' is still an official record of a visit and a complaint. Under California's Song-Beverly Act, repair attempts count even when the dealer cannot reproduce the fault.
Request that the technician check for DTCs before clearing them and ask for a copy of the DTC printout. DTC B000A (shift to park signal not detected by BCM) has been documented in TSB 19-NA-206 as the code associated with this failure — if it is stored, the vehicle produced evidence even if the symptom was not active during the dealer visit.
If the dealer performs the TSB 19-NA-206 harness repair and the issue returns, document the recurrence with the same discipline. Multiple repairs for the same defect — not multiple trips for multiple defects — is exactly the pattern lemon law cases are built around.
The 2018-2023 Chevrolet Traverse is a capable family hauler let down by a handful of well-documented manufacturing and design defects. The 'Shift to Park' issue stands out because GM revised the fix at least three times over five years without eliminating the problem at the source — that pattern of repeated TSB updates without a permanent solution is exactly the kind of record that strengthens a lemon law claim. The accumulator bolt recall is more serious on paper: missing bolts on a transmission component that can leak fluid near ignition sources is a safety defect, not an inconvenience. Owners who experienced propulsion loss or fire-related damage before the remedy was applied deserve to know that their situation may exceed ordinary warranty repair territory. If your Traverse has a documented repair history for either of these issues without a lasting resolution, the law may provide a path that does not require you to simply live with it.
— The Margarian Law team
Has your 2018-2023 Chevrolet Traverse been back to the dealer more than once for the 'Shift to Park' message, a transmission fluid leak, or any of the issues described above — without a lasting fix? You may have lemon law rights. Contact Margarian Law to find out whether your situation qualifies. Our consultations are free, and if we take your case, the manufacturer typically pays our fees.
The 'Shift to Park' warning appears when the park switch inside the shift control assembly fails to send the correct signal to the vehicle's body control module (BCM). The BCM does not register that the shifter has fully seated in Park, so the vehicle behaves as if you forgot to shift — even though you did not. GM issued TSB 19-NA-206 (and several follow-up revisions through 2024) addressing the issue; the fix involves installing a new shifter harness and in-line jumper harness. If your dealer has already performed this repair and the message has returned, document every recurrence with photos or video. Multiple repair attempts for the same defect are a key factor in a California lemon law claim.
NHTSA recall 20V668 (GM internal number N202313440) covers certain 2018-2020 Chevrolet Traverse vehicles — along with several other GM models — because the start/stop accumulator endcap in the transmission may have missing bolts from the factory. Missing bolts can allow transmission fluid to leak. If that leak contacts an ignition source, GM's own recall language warns of an increased fire risk. The recall also notes that a fluid leak can progress to a complete loss of drive power while the vehicle is moving. The remedy — inspection and replacement of the accumulator endcap assembly — was made available at dealers beginning December 15, 2020, at no charge. If you own a 2018-2020 Traverse and experienced a fluid leak, propulsion loss, or fire-related event before or after the remedy, document those incidents and speak with a lemon law attorney.
This is a known transmission control module (TCM) software issue addressed by GM TSB 18-NA-121. The TCM develops a software fault that causes it to lock the transmission in first gear or reverse only, preventing normal upshifts and limiting the vehicle to roughly 25 mph. A check engine light is usually present, and technicians may find DTC P2731 stored. The fix is a TCM software reprogram at the dealer. If the problem returns after reprogramming, or if you experienced more than one episode before the vehicle could be diagnosed, keep all your repair orders — repeated visits for the same transmission fault can support a lemon law claim in California.
Yes. GM issued service information bulletin PIP5681C documenting a weld defect on the Bank 2 front exhaust flex pipe support bracket in 2018-2022 Traverse vehicles equipped with the 3.6L V6 engine. When the bracket separates, it opens an exhaust leak that triggers lean fuel mixture codes (P0171, P0174) and accelerates catalytic converter deterioration. GM issued Special Coverage programs (good for 15 years or 150,000 miles) for the 2019 and 2021 model years, but owners of 2018, 2020, and 2022 model-year vehicles were not included — even though the design is identical. If your Traverse has had repeated catalytic converter or exhaust repairs, note that GM's own Special Coverage programs confirm this is an acknowledged manufacturing defect, which is relevant context when pursuing warranty cost recovery or a lemon law claim.
Yes. In California, a 'cannot duplicate' finding does not automatically disqualify your claim. What matters is whether you reported the defect during the warranty period and whether you gave the manufacturer a reasonable number of attempts to fix it. Each dealer visit — even one where the technician writes 'unable to duplicate' — is a documented repair attempt. The most important steps are: (1) get a written repair order every time you bring the vehicle in, even for an inconclusive visit; (2) photograph or video the symptom when it occurs, with a date-and-time stamp; (3) ask the dealer to check for stored DTCs and request a copy before codes are cleared. For the 'Shift to Park' issue, DTC B000A is the documented code that confirms the BCM received no park signal — if it appears on a printout even when the symptom is not active, that is meaningful evidence. If you believe you may have a lemon law claim, a California lemon law attorney can review your repair history at no cost to you.
A sudden loss of drive power or a vehicle that rolls in Park are serious safety symptoms that were the subject of NHTSA recall 23V172 (GM N222389310) for certain 2023 Traverse vehicles built between September 19, 2022 and January 20, 2023. The root cause was an incorrectly sized transmission sun gear that could allow the driver-side half-shaft to disengage from the transmission, removing both propulsion and the mechanical park lock. If your 2023 Traverse has experienced either symptom, stop driving the vehicle and contact your GM dealer immediately. Verify whether your VIN is included in recall 23V172 at NHTSA.gov or by calling your dealer. Document everything — propulsion loss events and rollaway situations are among the strongest factual bases for a lemon law claim, regardless of mileage.
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