really awful
Crashes / Fires:
1 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
49,057 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2004 Volvo S40 engine problems

engine problem

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2004 Volvo S40 Owner Comments

problem #3

Feb 262011

S40 4-cyl

  • 85,000 miles


The contact owns a 2004 Volvo S40. The contact stated that as the vehicle was started, the engine exhibited an abnormal increase in engine rpms up to 4000. The contact then shifted into drive and the vehicle abnormally accelerated to 40 mph. The contact stated that he drove home with the brakes depressed as the vehicle continued to move forward. When he arrived home, he abruptly jammed down on the brake pedal and shifted to park until the vehicle came to a stop. The manufacturer was contacted and advised that the failure could be caused by a defect in the throttle cable. The contact inspected the throttle cable and discovered that the spring was melted causing the throttle to remain open and the vehicle to accelerate. The dealer was contacted and was awaiting the arrival of the necessary parts to make repairs. The failure mileage was 85,000 and the current mileage was 130,000. Updated 06/03/11 the throttle cable was coming apart. Updated 08/08/11

- Anthony, FL, USA

problem #2

Sep 092007

S40 5-cyl

  • Automatic transmission
  • 37,171 miles
The contact owns a 2004 Volvo S40. While attempting to park the vehicle with the brake pedal depressed, the vehicle accelerated on its own and crashed into a telephone pole. The contact was uninjured. The vehicle was taken to the dealer and they repaired the damages at the cost of $8,000. The cause of the failure could not be determined. The failure mileage was 37,171 and current mileage was 38100 updated 1/5/09 updated 01/09/09.

- Lowell, MA, USA

problem #1

Dec 292006


  • Automatic transmission
  • 25,000 miles
Dashboard went crazy, fading in and out. All panels were unreadable, speedometer, radio, temperature gauge. Car accelerated on its own, without my foot on the pedal. Cd was shot into the backseat landing in my child safety seat. All of this occurred while driving on the highway. In all 3 instances the message indicator stated to not drive the car. I had the car towed to 2 different dealers. The first time they said it was the software and reinstalled. The second time, they replaced the alternator and the car was in the shop for over a week, the third time, the replace the cem module and radio. The the fourth time the car wouldn't read the key and had to be towed and they replaced the steering module. This car has been in the shop 3 times in less than 6 months for 3 electrical related issues the car only has 42,000 mile.

- Hudson, MA, USA

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