2007 mercury grand marquis accelerator problems. Consumer states that the throttle is up to high and he doesn't even have to push the accelerator down, it automatically moves when it is put into gear. *kb the consumer stated when he removed his foot from the accelerator, there was no noticeable deceleration. The dealer informed the consumer the throttle control sensor was set at the factory and…
2007 Mercury Grand Marquis cruise control problems
severe 11 complaints filed with NHTSA · avg repair $600 · see cruise control across all vehicles →
Complaints
11
Recalls
0
Avg fix
$600
4crashes
When does it fail?
Of the 11 cruise control complaints filed for the 2007 Mercury Grand Marquis, here's the actual mileage breakdown — failures cluster heaviest at 100,000-125,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
No new NHTSA cruise control complaint has been filed on this vehicle in over 18 years — the issue may be aging out of the active population.
The failure pattern owners describe
Owners of 2007 Grand Marquis vehicles report sudden unintended acceleration occurring across a wide mileage range—from 26,000 to 180,000 miles. The events happen during parking, highway driving, traffic-light stops, and gear shifts. Braking hard does not stop acceleration; several owners had to turn off the engine and coast to a safe stop. Some events caused collisions or near-misses. One owner's accelerator pedal stuck at full throttle and required hard repeated strikes to release it. Another reported the adjustable accelerator pedal repositioning itself to brake-pedal height while driving.
Dealership diagnostics have proven largely ineffective—technicians cannot duplicate most failures and sometimes misdiagnose the issue. One dealer blamed carbon buildup; another reported the throttle sensor was factory-set and not adjustable. A separate independent mechanic was able to reproduce one failure that the Ford dealer claimed was normal operation.
Owners also report that the brake and accelerator pedals sit too close together at the same height, causing them to press both when trying to brake. This layout is not adjustable and forces owners to concentrate heavily to avoid accidental acceleration. The manufacturer was notified in only a couple of cases, and no recalls or technical service bulletins were mentioned by any owner.
Same Mercury Grand Marquis cruise control reports on nearby years: 2005 · 2006 · 2008
Failure modes owners describe
Sudden unintended acceleration — electronic/sensor origin
Vehicle accelerates forcefully without driver input or with light pedal application. Occurs at various driving speeds and conditions (highway, parking lot, traffic light, shifting). Engine shutdown and restart temporarily stops the issue; recurs on separate occasions. Dealership diagnostics often inconclusive; one case involved throttle control sensor adjustment.
When: From 26,000 to 180,000 miles; multiple owners report recurrence
Symptoms owners cite: Sudden engine revving and forceful acceleration; Vehicle accelerates despite brake pedal depression; No deceleration when foot removed from accelerator; Occurs when shifting into drive or reverse; Throttle at high position without pedal input
Repairs/costs cited: Ford dealer reported carbon buildup in air filter in one case; throttle control sensor factory-set (not dealer-adjustable per one report); most cases undiagnosed or unrepairable at dealer level
Recalls/TSBs owners mention: Manufacturer notified in two cases; no recalls or TSBs mentioned by owners; dealership diagnostics unable to duplicate failure in multiple instances
Power adjustable foot pedal malfunction
Adjustable accelerator pedal repositioned itself without warning while vehicle in motion, moving to same level as brake pedal. Driver then inadvertently engaged throttle. Happened very early in vehicle life (180 miles). Second independent mechanic able to duplicate the failure.
When: At 180 miles; current mileage 260 miles
Symptoms owners cite: Accelerator pedal auto-adjusted without driver input; Pedal moved to same level as brake pedal; Near collision due to unintended throttle engagement; Ford dealer initially misdiagnosed as normal operation
Repairs/costs cited: Diagnosed by second mechanic who duplicated failure; Ford dealer initially found vehicle normal
Accelerator pedal stuck or sluggish release
Gas pedal goes to floor and does not release smoothly. Owner had to repeatedly hit pedal hard multiple times over approximately 2 miles before it finally released. Brake pedal did not effectively slow vehicle while throttle was stuck.
When: Mileage not stated
Symptoms owners cite: Accelerator pedal stuck at floor position; Pedal does not release with normal foot lift; Requires hard repeated pedal strikes to free; Brake ineffective in slowing vehicle with stuck throttle
Repairs/costs cited: Not repaired; owner self-remedied by repeated forceful pedal strikes
Brake and accelerator pedals too close, same height
Pedal layout creates ergonomic hazard: brake and accelerator positioned too close together and at identical height. Driver repeatedly depresses both pedals simultaneously when attempting to brake, resulting in unintended acceleration. Pedals are not adjustable.
When: Ongoing throughout ownership
Symptoms owners cite: Simultaneous brake and accelerator pedal depression when braking; Unintended acceleration during braking attempts; Requires constant concentration to avoid hitting accelerator; Driver reports vehicle 'keeps on going' when both pedals engaged
Repairs/costs cited: No repair available; pedals not user-adjustable
Synthesized from 11 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 2 most recent
Gas pedal went all the way to the floor and would not release. I kept hitting the pedal to try and release it for about 2 miles. I kept my foot on the brake to try and slow the car down, but that didn't help. The floor mat was not under the pedal because it is too short to reach it. After hitting the pedal as hard as I could numerous times it released. *tr
Had cruise control trouble with your 2007 Mercury Grand Marquis?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the cruise control problem on the 2007 Mercury Grand Marquis?
It's a meaningful issue. 11 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $600.
At what mileage does the cruise control typically fail?
Based on the 11 complaints filed, cruise control issues most often appear around 70,143 miles. Some report problems earlier; some make it well past 150,000 with no symptoms. Maintenance habits matter — vehicles that received timely fluid services and were not regularly overworked tend to last longer.
What does it cost to fix?
Independent shops typically charge around $600 for cruise control repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to cruise control?
No active recalls currently cover cruise control issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2007/Mercury/Grand Marquis.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.