ENGINE POWER REDUCED FOR 2006 PONTIAC G5 PERSUIT
Had this problem after getting water into the air intake.
Searched the net, and here a a host of suggestions.
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FROM THE NET
i know the 300 code is cylinder misfire... i had that issue, are you using the stock delcos?
P0171- this is a lean code. are you using 89-91 gas when you should only be using 87? that could do it.
P0106-The Powertrain Control Module (PCM) uses the Manifold Absolute Pressure Sensor (MAP) to monitor engine load. (NOTE: Some vehicles have a Barometric Pressure (BARO) sensor that is integral to the Mass Air Flow (MAF) sensor and do not have a MAP sensor. Other vehicles have a MAF/BARO and a redundant MAP sensor where the MAP sensor functions as a backup input in case of MAF failure.) The PCM supplies a 5 Volt reference signal to the MAP sensor. Usually the PCM also supplies a ground circuit to the MAP sensor as well. As the manifold pressure changes with load, the MAP sensor input informs the PCM. At idle the voltage should be 1 to 1.5 Volts and approximately 4.5 Volts at Wide Open Throttle (WOT). The PCM looks for any change in manifold pressure to be preceded by a change in engine load in the form of changes in throttle angle, engine speed, or Exhaust Gas Recirculation (EGR) flow. If the PCM doesn't see any of these factors change while detecting a rapid change in MAP value, it will set a P0106.
Potential Symptoms
The following could be symptomatic of a P0106:
* Engine runs rough
* Black smoke at tailpipe
* Engine will not idle
* Poor fuel economy
* Engine misses at speed
A P0106 could be caused by:
* Bad MAP sensor
* Water/dirt intrusion affecting MAP sensor connector
* Intermittent open in the reference, ground, or signal wire for the MAP sensor
* Intermittent short in the reference, ground, or signal wire for the MAP sensor
* Ground problem due to corrosion causing intermittent signal problem
* A break in the flexible air intake duct between the MAF and the intake manifold
* Bad PCM (do not assume the PCM is bad until you've exhausted all other possibilities)
Possible Solutions
Using a scan tool, watch the MAP sensor value with the key on, engine off. Compare the BARO reading with the MAP reading. They should be roughly equal. The voltage for the MAP sensor should read approx. 4.5 volts. Now start the engine and look for a significant drop in the MAP sensor voltage indicating the MAP sensor is working.
If the MAP reading doesn't change perform the following:
1. With the Key on, engine off, disconnect the vacuum hose from the MAP sensor. Using a vacuum pump, pull 20 in. of vacuum on the MAP sensor. Does the voltage drop? It should. If it doesn't inspect the MAP sensor vacuum port and vacuum hose to manifold for a restriction of some kind. Repair or replace as necessary.
2. If there are no restrictions, and the value doesn't change with vacuum, then perform the following: with the Key on and engine off and the MAP sensor unplugged, check for 5 Volts at the reference wire to the MAP sensor connector with a Digital Voltmeter. If there is none, check for reference voltage at the PCM connector. If the reference voltage is present at the PCM connector but not the MAP connector, check for open or short in the reference wire between MAP and PCM and retest.
3. If reference voltage is present, then check for existing ground at the MAP sensor connector. If it isn't present then repair open/short in the ground circuit.
4. If ground is present, then replace MAP sensor.
1) I drive a 2006 Pontiac G5. Just recently, it started going in to Reduced engine power, meaning that I was and STILL am not able to accelerate.
Anyways, the mechanics at my local GM delarship told me "If the car wasn't in reduced engine power at the time, they couldn't tell what code it was and therfore were unable to idenitify what the actually problem was". So as a shot in the dark, it was reccommended that I replace the pedal accelerator, which I did. All but gtwo days late, reduced engine power yet again.
However, THIS TIME, when it went in to reduced engine power I was close to the dealership and actually took it in and left in running so that the mechanic could sit in it. Anyways, after a codes test, it was then determined that I needed to replace my ECM. This was done, and no less then a week later, reduced engine power AGAIN.
I took the car in, and the mechanic literally shrugged and said that GM mechanics have no idea how to fix this problem, and actually suggested that I trade in for a new car.....
From what I have been reading, this "reduced engine power" is a serious problem for GM - one that warrants a recall.
I hope I added some insight - and if anyone has any suggestions I would love to hear from you! Right now I stuck with a 4-year old lemon in my driveway
I still remember my first and only experience with reduced power it turned out to be a wire was not plugged all the way in on the transmission. If its a short in a wire causing it that's a hard problem to find give the shop some time to find it but if you are unhappy with the current shop do take it in to another one.
This is what I got from gm service information
Reduced Engine Power Mode
When the ECM detects a condition with the TAC system, the ECM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions:
• Acceleration limiting--The ECM will continue to use the accelerator pedal for throttle control, however, the vehicle acceleration is limited.
• Limited throttle mode--The ECM will continue to use the accelerator pedal for throttle control, however, the maximum throttle opening is limited.
• Throttle default mode--The ECM will turn OFF the throttle actuator motor and the throttle will return to the spring loaded default position.
• Forced idle mode--The ECM will perform the following actions:
- Limit engine speed to idle by positioning the throttle position, or by controlling the fuel and spark if the throttle is turned OFF
- Ignore the accelerator pedal input
• Engine shutdown mode--The ECM will disable fuel and de-energize the throttle actuator.
The tac system is the throttle actuator control
. . . THOUGHT we had it each time..
replace ECM, Body control modules, everything but the kitchen sink... then took the fuse box out to replace the whole boxx and a wire underneath it was pinched and shorting out....
solved all teh problems... moral of the story, loose wire, pinched wire, bad ground something somewhere is prolly shorting out..
Ok had to wait for the check Engine to come on again so I could check the codes. I got two codes (P1515 / P2101)!! P1516 refers to the TAC and says The ECM has detected an out of range condition between the predicted and actual throttle position. P2101 refers to the Throttle Position sensor, And says that the TP senor does not agree with the APP. It Further stated that the ECM has detected the TPS angle does not agree with the APP commanded angle.
Ok heres the deal, I took the Throttle body off, cleaned it (looks like new!!) real good and then I checked the Module on the side of it for moisture and the connection!!! Put every thing back together,and so far every thing is good ( no check engine light- no Reduced Engine Power mode,and the car is running fine!!!
Lampoon you are the man thanks again for that ON THE MONEY CALL!!!!
