What garage was it at ? Dealer
reduced engine power means there is a problem with the electronic throttle control .this will shut off traction control off .
Were there any DTC'S - diagnostic trouble codes read from the PCM - engine computer .
No crank REDUCED ENGINE POWER case study 13 GMC Acadia Part 1
Drive by Wire Function and diagnostics by Wells
SOURCE: Service engine light keeps coming on
need to scan for codes and find problem code some part stores do for free
SOURCE: service engine soon and reduced engine power
disconnect batt. for 30 min. then reconnect,if no problem exist the lights will go away
SOURCE: I am getting a
If the battery was disconnected,then it is possible that it will need to be re-flashed at the dealer.But have the alternator checked again.It should be reading 13.65 volts,to 14.25 volts,with everything on,high blower,and head lamps,if it is any lower than this,the alternator is defective,now if the battery has a defect in it,it may have caused the alternator to go out,have it checked also,and re charge the battery at a slow rate,such as 2 amps,all night,or longer would be better.The battery will get a deep charge that will hold a lot longer than a quick charge,and is better for the battery.
SOURCE: 2008 gmc sierra 1500 crewcab.
Hi, A vehicle may be brought into the dealer for a reduced power message, and DTCs P0120, P0220, P1516, P2101, or P2135. Please get back to us if you have any further query or else accept the solution. Thanks for contacting fixya.com
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.
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)
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
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