It has all this codes p0120 p0220 p2135 p1516 p1258 p0894 and so confuse
P0894 Transmission Slipping
P1258 Engine got Hot
P1516 Throttle Actuator Control (TAC)
Chevrolet Tahoe vehicles may experience a performance issue where they
will not go over 15MPH. The vehicle may appear to be in "limp-in" mode,
giving just enough power to get you to a shop. 
The
codes indicate a problem with the throttle position sensor circuits and
throttle actuator performance. Do NOT start replacing parts. Shops
report a pattern failure in the electrical harness to these sensors.
Chevrolet has issued a revised replacement harness to correct the
problem. The original connector was prone to vibration and broken wires
that disrupted the signal to the PCM and put the vehicle into reduced
power mode.
SOURCE: reduced power p1516 code
P1516 Throttle Actuator Control(TAC) Module Throttle Actuator Position Performance
This is your problem and should be taken in to chevy for repair
SOURCE: I need the serpentine belt diagram for a chevy Express Van
DRIVE BELT DECAL SHOULD BE UNDER THE HOOD.OR YOU CAN GO TO DEALERSHIP GET ONE AUTO ZONE OR ADVANCE AUTO PARTS CAN GET YOU ONE.OR YOU CAN BUY A HAYNES REPAIR MANUAL IT HAS BELT DIAGRAM.
SOURCE: dtc code p0121 and p2135 2007 chevy malibu
both codes refer to the throttle position sensor, the sensor is at the throttle plate, on the side of the throttle body. to test remove the connector to sensor, use a ohms meter to test. put 1 lead to top connection and the other to the bottom one. move throttle and the needles on the ohms meter should move very even, move throttle slow to get a good reading, needle should move without no hesitation, if the test is bad replace tps sensor. if the sensor gets to bad, it can have an effect on transmission shifting. after fixing sensor have the light turned of with an obd2 scanner.
SOURCE: Chevy aveo error codes. I have a check engine light on.code p2135
P2135 Throttle Position Sensor (TPS) Property Malfunction, remember this is not a car that is built by GM it is a Korean import.
SOURCE: Reverse and interior lights out, chevy express van
Fuse block under the hood. Driver's side, under the brake master cylinder. Number 18. TCB#2. Replace the fuse.
There is an under-engineered ground in the reverse circuit. If you back up with the dome lights on, it could blow that fuse. There should be some extra fuses under the cover of the fuse block.
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