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My truck will rev up to about 2500 rpms then won't go past that. no power at that point. tranny shifts fine. engine sounds like its not running on all cylinders and has higher gas consumption.

I haven't tried anything yet. but I disconnected the battery for a while and it seems to be a little better but this morning it seems even worse.

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  • Contributor
  • 38 Answers

If you have one, some do, some don't, I'd suspect a faulty rev limiter. I don't know where it would be located, though, I just heard of them.

Posted on Nov 19, 2014

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6ya6ya
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Posted on Jan 02, 2017

  • 33 Answers

SOURCE: 2001 cavalier codes

P0621 - indicates a failure in the alternator lamp curcuit.
P0304 - indicates a miss fire was detected in the #4 cylinder
U1040 - indicates a loss of communication with the ABS system
U1000 - Indicates a class 2 communication loss

None of those codes are relating to a transmission failure (P0700-P0702)

I would have a visual look at the transmission and verify that all electrical wires are connected and tight. Then I would have the transmission serviced if it hasn't been within the last 35,000 miles.

Have the trouble codes cleared and address the ones that return.

After that you may be looking at an internal transmission adjustment and/or repair.

Good luck.

Posted on Nov 24, 2008

  • 1 Answer

SOURCE: Lack of acceleration

Hi, I had the same problem with my 2003 Impala and it was a clogged catalytic converter and fuel filter. I had both of those replaced and my car runs like new again. I'm 99% sure this is your issue. My car had the exact problems you're experiencing. It was horrible trying to get on the highway from an on ramp that went up a hill :o)

I also work with someone who has a 2002 impala and the same thing happened to hers as well.

I got mine fixed at a local repair shop for around 300.00. If you take it to a dealer, it would be a lot more.

Good luck :o)

Posted on Nov 25, 2008

  • 4369 Answers

SOURCE: 1999 ford expedition - transmission slip?

the flashing O/D light usually means you have a bad speed sensor that sends speed info to the engine & trans computer.

Vehicle Speed Sensor The vehicle speed sensor (VSS) (Figure 42) is a variable reluctance or Hall-effect sensor that generates a waveform with a frequency that is proportional to the speed of the vehicle. If the vehicle is moving at a relatively low velocity, the sensor produces a signal with a low frequency. As the vehicle velocity increases, the sensor generates a signal with a higher frequency. The PCM uses the frequency signal generated by the VSS (and other inputs) to control such parameters as fuel injection, ignition control, transmission/transaxle shift scheduling and torque converter clutch scheduling.
-------------------------------------------------------------------
Vehicle Speed Sensor The vehicle speed sensor (VSS) (Figure 42) is a variable reluctance or Hall-effect sensor that generates a waveform with a frequency that is proportional to the speed of the vehicle. If the vehicle is moving at a relatively low velocity, the sensor produces a signal with a low frequency. As the vehicle velocity increases, the sensor generates a signal with a higher frequency. The PCM uses the frequency signal generated by the VSS (and other inputs) to control such parameters as fuel injection, ignition control, transmission/transaxle shift scheduling and torque converter clutch scheduling.

-------------------------------------------
Some trans use an OSS, Output Shaft Sensor instead of a VSS. Depends on which trans you have, 4R100 or 4R70W

Transmission Control Switch (TCS) and Transmission Control Indicator Lamp (TCIL)
The transmission control switch (TCS) is a momentary contact switch. When the switch is pressed, a signal is sent to the powertrain control module (PCM) to allow automatic shifts from first through fourth gears or first through third gears only. The PCM energizes the transmission control indicator lamp (TCIL) when the switch is off.

The TCIL indicates overdrive cancel mode activated (lamp on) and electronic pressure control (EPC) circuit shorted (lamp flashing) or monitored sensor failure.

Output Shaft Speed (OSS) Sensor
The output shaft speed (OSS) sensor is a magnetic pickup, located at the output shaft ring gear, that sends a signal to the powertrain control module (PCM) to indicate transmission output shaft speed. The OSS is used for torque converter clutch control, shift scheduling and to determine electronic pressure control.

Posted on Jun 01, 2009

wracefans24
  • 1985 Answers

SOURCE: My 97 Dodge Ram 1500 5.2L Pickup has started

if the truck feels like,
the more gas you give it the slower it goes,
you might want to check for a converter plugging up.

Posted on Jan 14, 2010

  • 538 Answers

SOURCE: 2001 Jetta won't shift into high gear/

In 2001 the "Check Engine" light might give information about what's going on with the transmission. You may want to have it checked by a shop before the transmission decides to die. It might be a simple fix.

Posted on Feb 19, 2010

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