Question about 2007 Pontiac G5 Gt Coupe

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2007 g5 Check engine light, reduced engine power, rough idling

Woke up one morning (temps below freezing), and the engine light was on with the words "reduced engine mode". Ran fine the night before. Rough idling around 1500 rpm. Error codes p0123 and p0223. Both are for the tps. Pedal connection not corroded. Any ideas?

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  • judgeoh
    judgeoh Jan 01, 2013

    Nevermind. Squirrels are the problem. Chewed through my wires right where they connect to the throttle body.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: rough start

try the plug and wire
then try the cap and rotor

Posted on Feb 05, 2009

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  • 8 Answers

SOURCE: check engine light

probably injectors fit new fuel filter and add cleaner to system.

Posted on Feb 21, 2009

  • 1168 Answers

SOURCE: 2007 G5 Rough running (missing). Doesn't die.

Hi shoemaker.
Fuel filter issues show up in high demand fuel needs such as passing or going up hills. Rarely do they cause rough idle problems.
Is the check engine light on or flashing? A flashing light indicates engine misfire and should be repaired as soon as possible.
So you could have a vacuum leak, a stuck EGR valve, bad ignition coil, worn spark plug, and many other items.
If you don't have a check engine light and haven't done a tune up do one to eliminate a few items and see if that smooths it out.
If you have further questions ask me and I will check and answer you.

KL

Posted on Jan 04, 2010

  • 2309 Answers

SOURCE: engine idles rough and misses at low rpm. power

get the egr valve checked, place to start

Posted on Apr 13, 2010

  • 4 Answers

SOURCE: 1992 pontiac grand am no acceleration, a rough idle (engine miss)

Does it have the 2.3l Quad 4 engine? If so replace the plastic piece that the coils go into, they go bad and leak spark to the cam towers and then you get a nice one or multiple cylinder misfire.

Posted on Apr 30, 2010

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Hi shoemaker.
Fuel filter issues show up in high demand fuel needs such as passing or going up hills. Rarely do they cause rough idle problems.
Is the check engine light on or flashing? A flashing light indicates engine misfire and should be repaired as soon as possible.
So you could have a vacuum leak, a stuck EGR valve, bad ignition coil, worn spark plug, and many other items.
If you don't have a check engine light and haven't done a tune up do one to eliminate a few items and see if that smooths it out.
If you have further questions ask me and I will check and answer you.

KL

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