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Check engine light comes on reduced power displayed code p2122 for 2009 chevy hhr

Engine light comes on reduced engine power reads code P2122 what does this mean

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Posted on Jan 02, 2017

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SOURCE: I have a 2010 Chevy impala. Reduced engine power

Hi Rosalee_IM,
The codes your vehicle is storing are for low voltage from your accelerator pedal position sensor and a gross evaporative emission leak. The code P2122 and P2138 are directing you to test the accelerator pedal position circuit and/ or sensor. This is the cause of the reduced power concern you are feeling.The P0455 is telling you there is a large leak in the evaporative emission system. The most common cause for this code is a loose or incorrectly installed gas cap.I hope this helps clarify the concerns you are experiencing. If you'd like more information on how to trouble shoot the problems,drop me a line. Please include the model Impala you have,(LS,LT or LTZ) and the engine size. I will do my best to get back to you as soon as possible.Thanks, Chuck

Posted on May 03, 2012

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SOURCE: Check engine light is on, reduced power displayed on dash, code P2122 and code P2127 comes up

its a problem with the pedal and throttle position corilation

Posted on Jul 09, 2012

Testimonial: "Thanks, I replaced the throttle positioning sensor (had to buy a whole new gas pedal as the sensor is in the pedal. Pretty easy fix, two 10 mm bolts and used a small screw driver to release the wiring harness. Replaced in about 10 mins. "

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P2122 P1174 p0507


If the check engine light is on then hook up an OBD reader (which is pretty easy to do and a lot of parts stores do it for free) and find out what the problem is.

Feb 17, 2014 | Chevrolet Cars & Trucks

1 Answer

Engine power reduced chevy impala


engine power reduced means that the CPU has placed the ECM in a safe operating mode and reduced power to lessen the risk of serious engine / transmission damage. Stop and check oil level and coolant level at the radiator cap. have the fault codes read urgently so as to prevent damage to the units

Dec 25, 2013 | Chevrolet Cars & Trucks

1 Answer

What does "Reduced Power, Traction Fault" mean?


GM's power strategy will reduce power if it doesn't see proper charging. It does this to conserve battery power by shutting off non-essential electrical accessories. It can also mean that the traction control system is reducing engine power to avoid a skid. The traction control system gets input data from the wheel speed sensors to figure out if you're entering a skid or the wheels are locking up. One way to get you out of the skid is to reduce engine power or pump your ABS brakes. In your case you should get the trouble codes read. An ABS or traction code code could be a C, U or B code which can't be seen by a cheap scan tool or the tools they use at auto parts stores. GM had major problems with the ABS wheel speed sensors built into the wheel bearing hubs in these vehicles. The fix involved replacing the hub. So get the codes read by a pro scanner to find out which wheel sensor is setting the code. Then do the fix. Also, the P0128 is usually caused by a bad thermostat. Fix that first, because if the engine doesn't get up to operating temperature, the computer can limit some features.
Read these posts for more trouble code information
http://ricksfreeautorepairadvice.com/p0128/
http://ricksfreeautorepairadvice.com/abstcs-light/

Jun 26, 2017 | 2005 GMC Canyon Crew

1 Answer

I have a 2010 Chevy impala. Service Traction control, Engine Power reduced and Service Stabiltrak message comes on. Also check engine light comes on and a triangle with a car in the middle and slippery...


had the same trouble with my '10 impala it turned out to be defective electronic accelerator pedal it is actually a recall for this vehicle and should be a free repair at your dealer.

Sep 27, 2012 | 2010 Chevrolet Impala

2 Answers

I have a 2010 Chevy impala. Reduced engine power and check engine light also comes on but won't stay on. Codes are P2138 P2122 P0455


Hi Rosalee_IM,
The codes your vehicle is storing are for low voltage from your accelerator pedal position sensor and a gross evaporative emission leak. The code P2122 and P2138 are directing you to test the accelerator pedal position circuit and/ or sensor. This is the cause of the reduced power concern you are feeling.The P0455 is telling you there is a large leak in the evaporative emission system. The most common cause for this code is a loose or incorrectly installed gas cap.I hope this helps clarify the concerns you are experiencing. If you'd like more information on how to trouble shoot the problems,drop me a line. Please include the model Impala you have,(LS,LT or LTZ) and the engine size. I will do my best to get back to you as soon as possible.Thanks, Chuck

May 03, 2012 | 2010 Chevrolet Impala

1 Answer

Need to know what the "reduced engine power' MIL


this is one of two things, first theres a problem with the engine , the way it runs its loosing power or if the wheels spin and the computer picks it up then it will reduce the power to avoid wheels from slippping, this is like when driving in the snow, now if the check engine light is coming on with this message then you have a problem and the first thing to do would be to have the codes pulled and see what codes are stored. what happens is the computer sees a problem and turns on the light and stores a code for that problem. for example there may be a code that reads po300 multiple misfires. this code would mean the computer has seen the motor misfiring and with some testing the problem can be found. there are many auot part stores that will scxan the computer for free and give you a read out with the code. if you get the codes i can help you further, have a good day.

Mar 18, 2011 | 2004 Pontiac Grand Prix

1 Answer

Hi: My engine light has been coming on and it says reduced engine power, which actually happens, the engine power reduceds making driving a little scary. It seems to happen mostly when it is cold out. My...


You need a new personal mechanic. When many codes come up, that means he detected many problems and his head started to spin like Beetle Juice. Find someone that knows how to interpret the meaning of those codes and do the correct repairs.

Oct 04, 2010 | 2006 Pontiac G6

1 Answer

Check engine lite is on, power lost lite is on. code p1276comes up. replaced throttle body, but no change. volts at vac fuse 14 both sides. will not accelerate over 1800 rpm's. 2004 trailblazer with 6cyl.


Your CODE P1276 refer to the Acelerator Pedal Position, Sensor 1 Circuit Range Performance.

Probable cause: Wiring, APP or ECM


GM - P1271 Accelerator Pedal Position Sensor 1-2 Correlation

I also found this... though its for Trailblazers... but may give you a clue:
Reduced Engine Power Message and/or Check Engine Light with any Combination of the following DTCs: P0107 P0112 P0122 P0452 P1120 P1220 P1221 P1271 P1275 P1280 P1481 P1515 P1540 P1633 P1635 P1639 P1682 #PIP3192 - (Oct 18, 2004)

Reduced Engine Power Message and/or Check Engine Light with any Combination of the Following DTCs: P0107 P0112 P0122 P0452 P1120 P1220 P1221 P1271 P1275 P1280 P1481 P1515 P1540 P1633 P1635 P1639 P1682 PCM Repeat.

The following diagnosis might be helpful if the vehicle exhibits the symptom described in the PI.

Condition/Concern:
Reduced engine power message and/or check engine light with any combination of the following DTCs: P0107 P0112 P0122 P0452 P1120 P1220 P1221 P1271 P1275 P1280 P1481 P1515 P1540 P1633 P1635 P1639 P1682

Recommendation/Instructions:
If the SI diagnostics did not isolate a concern, the following information may be helpful:
- Inspect the main engine wiring harness between the PCM and the generator assembly for a potential short to ground. There is a metal wiring harness retainer in this area that secures the main engine harness. If the harness conduit is mispositioned, some of the wiring may become exposed and chaff on the harness retainer. This may eventually cause the exposed circuit to short to ground.

- Inspect the 3 harnesses that connect to the PCM for potential shorts to ground on the metal PCM mounting bracket, just below the PCM. There are plastic harness retainers on the PCM bracket that secure the harnesses to the PCM bracket. If the harness conduit is mispositioned, some of the wiring may become exposed and chaff on the PCM bracket. This may eventually cause the exposed circuit to short to ground.

- If a chaffed circuit is found in either of the above locations, repair the circuit using the necessary SI procedures. Once the circuit is repaired, tape the area of the affected area of the harness to prevent the wires from becoming exposed in the future and secure the harness using the original harness retainer.

This applies to 04:
- 4.2L 5.3L LL8 LM4 Engine with DTC - P2120 or P2122 or P2123 or P2125 or P2127 or P2128 - kw low MIL pedal power reduced #PI01746 - (Feb 17, 2004)
- 4.2L 5.3L LL8 LM4 Engine with DTC - P2120 or P2122 or P2123 or P2125 or P2127 or P2128.

When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.

Condition/Concern:
MIL light on. Reduced Power message on DIC. Possibles DTCs P2120 and/or P2122, P2123, P2127, and P2128.

Recommendation/Instructions:
The APP harness is clipped to the accelerator pedal bracket. The harness may chaff on the upper portion of the accelerator pedal causing a short to ground. Verify the harness is not chaffing on the accelerator pedal. After repairing the short, reposition the harness to ensure no contact between the harness and the accelerator pedal.

Hope helpes.

Feb 09, 2010 | 2004 Chevrolet TrailBlazer

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