Question about 2002 Chevrolet TrailBlazer

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2002 trailblazer shut down and won't start..coded it and came up with p1516 & p1220.so I cleaned the throttle body and checked for loose pigtail but found none on both of the throttle body or the

When my heater was on it also bogged down and wanted to shut off until I turned the heater off it was fine.how do I solve this issue ?

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I replaced the resister to the blower and now it works

Posted on Mar 29, 2014

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    Justin Mar 29, 2014

    Where is that located at

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2002 trailblazer lxt codes p1516 & p1220


First off when you say it won't start does the motor turn over but won't start or does it do nothing

Mar 29, 2014 | 2002 Chevrolet TrailBlazer

1 Answer

Engine won't start and shows trouble code P1516 and reduced engine power light is on


Here is the definition of the code.

Possible causes - Faulty Throttle Actuator Control (TAC) module
- Throttle Actuator Control (TAC) module harness is open or shorted
- Throttle Actuator Control (TAC) module circuit poor electrical connection (loose or broken wires)

P1516 CHEVROLET Description The Throttle Actuator Control (TAC) module contains data which is essential for proper TAC operation. The TAC module continuously test the integrity of this data. When the TAC module is unable to write or read data to and from Random Access Memory (RAM), or the TAC module is unable to correctly read data from the flash memory or and internal TAC module processor fault is detected and the Detected Trouble Code (DTC) is set.
Read more: http://engine-codes.com/p1516_chevrolet.html#ixzz286Gl3cSo

Sep 28, 2012 | 2002 Chevrolet TrailBlazer

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2004 trial blaz. 4.2 eng. ran fine, but service eng. light on, i put 2 map, & 3 coolant sensor in, after each, coolant sensor the blaz, won't idle, when ac. is on, down rd. with ac. on, ok, but tac...


Hello: Remove the ducting going from the air cleaner to the throttle plate, clean the carbon off the throttle plate and the throttle body bore. Do not spray excess carb cleaner into the throttle body. Hold the throttle plate open with your hand and spray carb cleaner on a soft rag and clean off carbon. When finished key on engine off for 10 seconds key off for 10 seconds do this a total of three tines.

Jun 27, 2011 | 2004 Chevrolet TrailBlazer

1 Answer

The reduce engine light comes on at 50 mph what could the problem be


DTC P0120 P0220 P1516 P2135 these should be the problem codes.
2003-2006 Chevrolet Avalanche, Corvette, Express, Monte Carlo, Silverado, SSR, Suburban, Tahoe, Trailblazer. for reduced engine power. p0120 is throttle position sensor, ( tps ). p0220 is relates to tps, p1516 tps is out of range. p2135 is a throttle body code, the throttle body needs replaced. but before you do it replace tps first to see if it takes care of the other codes. have a good day !!

Feb 18, 2011 | 2003 Chevrolet TrailBlazer

1 Answer

Idles fine sounds good but when u have incline or give it alot of gas it goes into reduced power mode and throws up two lights and two codes p1515 and p1516. Once in reduced power mode u cant do anything...


These codes are related to the throttle body and the throttle position sensor. Check to make sure there is no binding at the throttle body. The problem could also be the stepper motor that drives the throttle plate.

May 21, 2010 | 2002 Chevrolet TrailBlazer

1 Answer

I have a 2005 GMC 2500HD code P1516, already replaced APP. Still dies, reduce engine speed comes up. What is the next step?


The Throttle Actuator Control (TAC) / throttle body type trouble codes, may be caused by a loose wiring crimp at the throttle body connector, or a broken throttle body circuit.Inspect all related throttle body terminals for a loose wiring crimp. The loose crimp may be difficult to find, and the poor connection will be between the terminal and the copper strands of the wire. Wiggle test the individual throttle body circuits to see if the concern can be duplicated.
Inspect the related circuits for broken wires inside the insulation. The outer wire insulation may look fine, but the internal copper strands may be partially broken. Breaks in the wires usually occur within 1 to 4 inches of the throttle body connector. Wiggle testing may also induce a trouble code to set.
On C/K trucks complete SI procedures for voltage drop on grounds G103 and G104. Grounds G103 or G104 may be loose or corroded. If a terminal crimp or a broken wire has been found, repair or replace only the circuits involved. There is a throttle body pigtail connector available through GMSPO, post back with what you find.

Dec 15, 2009 | GMC Sierra 2500HD Cars & Trucks

1 Answer

No power


The problem may be located at the connector on the throttle body. The terminals can be loose, broken wires inside the the plastic where you cant see them, and corroded grounds.

If you can get the check engine light to shut off, try wiggling the wiring from the connector on the throttle body from the connector out to at least 4 inches to induce a check engine light. Clean and tighten the grounds on the engine block also.

Good luck finding the problem.

Dec 12, 2009 | 2003 GMC Sierra

1 Answer

2002 Chevy Trailblazer


hi, those sound like throttle actuator codes. the throttle body on your vehicle should be an electronically controlled unit without wires to control actual acceration an deceleration. now, there is also an electronic switch called a potentiometer on the gas pedal that transmits signal to the throttle body to tell it what to do. most of the time, the throttle body is what goes bad here. you should also check the wiring to the unit for bad connection by wiggling the wire connector and seeing if the reduced engine power light comes on. if this happens, you will likely have to replace the wiring pigtail and the throttle body. but, in some cases, the gas pedal switch goes bad, and likely what is not allowing the transmission to shift out of park, the pcm may lock out the solenoid controlling the shifter. but, don't just run with that answer, it maybe completely wrong. i have seen more throttle bodies and wiring harnesses go bad than gas pedal switches in those vehicles. but you might want to have a shop diagnose further, it may even be two unrelated problems, or in the powertrain computer itself.

Mar 26, 2009 | 2002 Chevrolet TrailBlazer

1 Answer

Air cond on 2002 trailblazer


This has been a regular problem on the 4.2 vortec motor. Usually the Throttle Body has to be cleaned. Even with as many as 30K miles. Easy process.. When you do this you must unhook the neg battery cable to reset the PCM. They make a throttle body cleaner (different than Carb/choke cleaner). You can get it at any parts outlet. Trailvoy.com has a article describing the whole process step by step. Takes about 30 minutes. Do a search in the article section under throttle body cleaning

Mar 03, 2009 | 2002 Chevrolet TrailBlazer

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