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Old 12-30-2013, 12:50 PM   #1
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Default TAC problem

Hello everyone, I am having problems with my 2007 3.5, rendevous it started when the weather got cold, I pulled out of the driveway and the reduced engine power light came on, after it warmed up it ran fine. I scanned it and got p2101 & p2135 codes. Then the weather turned warm again for a while and every thing was fine, but when it got cold again it did the same thing I scanned it again and got p2102 code. I checked all connectors at throttle pedal and TAC , did tug test and all seemed ok, I tryed a new throttle pedal, and at that time it warmed up again for a while and it was all good, but then back to cold weather and the problem has returned, so it just does this when it'* cold, possibly someone can point me in the right direction Thanks Jeffrodc
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Old 12-30-2013, 04:00 PM   #2
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codes seem to have to do with throttle actuator in throttle body more than petal.

The following diagnosis might be helpful if the vehicle exhibits the symptom(*) described in this PI.

Condition/Concern:
A vehicle may be brought into the dealer for a reduced power message, and DTCs P0120, P0220, P1516, P2101, or P2135.

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.

Recommendation/Instructions:
Complete the current SI diagnostics for any symptoms or trouble codes found. If a intermittent T/P or TAC module type code is occurring complete the inspections below.

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, but installing this pigtail connector may cause other intermittent TAC module/TP codes at a later date. If this pigtail must be used, please follow the SI procedures for Splicing Copper Wire Using Splice Sleeves. (the proper Kent-Moore crimping tool must be used for this repair)
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