Q: Throttle is not responsive - 2003 GMC Yukon

asked by on

whenever I accelerate in first gear it holds it for a couple seconds with higher rpms before up shifting. I already changed the spark plugs and cables. my truck shakes when I step on it but only in first gear, after that I have no issue. I scanned it and only shows me code p0300. random misfire on one or multiple cylinders. I cleaned out the throttle body and still nothing. that's the only code I get. another problem is the oil temperature needle is stuck at 80. do I need to change the oil sending unit sensor? please and thank you for your time to reply.

My car has 190600 miles.
My car has an automatic transmission.

Hi there. From the description your vehicle only shakes in first gear, with delayed upshift seems unusual. Assuming the P0300 code is continuing to return, it leads me to believe you may have a fuel delivery issue. Low fuel pressure could be a faulty fuel pump. It could also, be a leaking fuel pressure regulator. This may be why you only feel the problem in first gear and the fuel pressure regulator not leaking bad enough to feel it in higher gears.

The oil pressure gauge stuck at 80psi all of the time is most likely the gauge at fault. This is common with GM vehicles. If the gauge is only stuck with the vehicle on, the oil pressure sending unit could be at fault. If you need to have this taken car of, a certified professional from YourMechanic can come to your car’s location to diagnose the unresponsive throttle and advise you on the best actions.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Throttle is not responsive - 2003 GMC Yukon

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Seal leaking

A rear main seal leaking on this engine is very common. The transmission must be removed to change it. I have seen this also occur from a failing PCV valve. It is it not functioning too much crankcase pressure can...

Q: I got sound when I shift to 3rd gear and it's get hard to put shift to second gear when car is in 3rd gear.

Hello. It sounds as though the synchronizers in the transmission, which are used to adjust transmission internal gear speed when upshifting or downshifting are possibly worn out or you are shifting a bit too fast. It is also possible that...

Q: Why does my car still hesitate to start???

There are many causes of hard starting but illustrative ones are a faulty engine coolant temperature switch (sensor), malfunctioning idle air control (IAC) valve, vacuum and EGR leaks, inadequate fuel delivery or pressure (clogged fuel filter, dirty fuel injectors), and...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.