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P2123 and p2128 - 2004 Chevrolet TrailBlazer

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P2138,p2128


Problem is with the tps (throttle positioning sensor) or wiring. Does it idle weird? or stall?

Jun 16, 2016 | Cars & Trucks

1 Answer

I have a 2005 cadillac sts that has a code of P2123 can anybody help me please i dont no what it means and what is the cause


code p2123 refers to accelerator pedal position sensor (APP) /switch D --high input===causes -- wiring short to positive--APP sensor/switch
Also --throttle position sensor/ switch (TP) D high input===causes wiring short to positive ---TP sensor switch
Check the APP/TP sensor/switch as the problem may be there.

Oct 31, 2014 | 2005 Cadillac STS

1 Answer

Codigos P2123 Y P2128 EN UN VW JETTA YA CAMBIE EL SENSOR DE PEDAL DEL ACELERADOR


OD NOT REPLACE THE PEDAL!!!POOR CONNECTION CAUSES THESE FAULTS AND EPC LIGHT ON AND LOSS OF POWER!!REPLACE THE WIRES AT THE PEDAL CONNECTOR.BEWARE THEY MUST NOT BE GOLD PLATED!!

Mar 18, 2014 | Volkswagen Cars & Trucks

1 Answer

Audi TT 1999 180bhp won't start , has the following codes P01413,P0036,P2123,P2128.


sounds like you need an electrical specialist, which I admit I am not..most of my electrical is on older cars/trucks..these new coputer cars baffle me unless my dumb luck just hits right..good luck..

Dec 08, 2013 | Audi TT Cars & Trucks

2 Answers

Reduced engine power, service traction control, service stabilitrak


First of all a scan tool is need for this not a code reader, you need to view scan data after you find what code is stored in the PCM. It could have a problem with the powertrain control module, wiring, or the Accelerator Pedal Position (APP) Sensors. Here are a few codes that could set .
DTC P2120: Accelerator Pedal Position (APP) Sensor 1 Circuit

DTC P2122: Accelerator Pedal Position (APP) Sensor 1 Circuit Low Voltage

DTC P2123: Accelerator Pedal Position (APP) Sensor 1 Circuit High Voltage

DTC P2125: Accelerator Pedal Position (APP) Sensor 2 Circuit

DTC P2127: Accelerator Pedal Position (APP) Sensor 2 Circuit Low Voltage

DTC P2128: Accelerator Pedal Position (APP) Sensor 2 Circuit High Voltage

DTC P2138: Accelerator Pedal Position (APP) Sensor 1-2 Correlation

Oct 02, 2012 | 2008 Chevrolet Tahoe LS

1 Answer

2002 Jetta,20v Turbo, idles rough and will do nothing when you give it gas. needs to be jumped to start and stays runnig with out cables. will move at idle speed only. EPC light is on, engine light stays...


I did some research on this and found a history of throttle position sensor issues.OBD codes are p0221, p2123, and p2128. All related to throttle position sensor. Need to call VW dealer and inquire of any recalls before you spend any money on this. One guy said dealer gave him a $10,000.00 estimate to repair and it may not fix it..... Sounds like some BS to me. You could **** near buy a new Jetta for that. LOL. Hope I've been some help. Try to get OBD codes if possible and then add information and we will see what we can come up with.

Sep 20, 2011 | Volkswagen Jetta Cars & Trucks

1 Answer

2004 VW jetta. trouble code P2128. what does it mean.


I would call the VW dealer. He can tell you.

Sep 11, 2010 | 2004 Volkswagen Jetta

2 Answers

Trouble codes P2128, P0643, P2138, P2122


ck with Nissan dealer, he can tell you.

Sep 11, 2010 | 2006 Nissan Altima

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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