2003 silverado 1500HD crewcab regular bed

Hi I’ve got several problems at the moment unfortunately on my 2003 Chevy Silverado 1500HD quadrasteer crewcab reg-bed
here they are: (obd2 codes)
P0455 (evaporative emission system leak detected (gross leak/no flow)
p2135 throttle/pedal position sensor/switch “A”/”B” voltage correlation
p0449 evaporative emission system vent control circuit intermittent
p0120 throttle/pedal position sensor A circuit
last three… my ac just stopped working i’m no expert but I’m thinking (hoping) it’s the low pressure switch ( I believe that’s the correct name) or if there is any common problems i’d like to know (and the shop says its fully charged)
And of course my prnd21 gear indicator light is intermittent and or non existent {I’ve heard this is a simple fix but I’m unsure as to what needs to be fixed/soldered )
Also my passenger window goes up very slowly is the motor going bad or is there another likely problem?
I’m pretty adept at working on vehicles but until I can get my hands on professional grade scan tools I am at a disadvantage. I have the tools and garage mechanic knowledge to do pretty-much any work on my truck and would like to avoid taking it in to the shop if at all possible.
MY HYPOTHESIS: the emissions lights I’ve heard can be triggered in dusty environments such as my farming town because the evap vent solenoid gives out, if this is the problem then its a 150 dollar fix which stinks but it’s not that bad… however I can’t seem to find one on my truck unless it’s on top of the gas tank I’m at a loss.
Thanks for your help in advance.

Freeautomechanic April 23, 2013 at 8:14 am

From all your codes, The throttle pedal codes are related to the TPS Sensor or wiring to/from it.
Possible causes
– Faulty electric throttle control actuator (TP sensor 1 and 2)
– Throttle Position Sensor harness is open or shorted
– Throttle Position Sensor circuit poor connection
– Faulty accelerator pedal position sensor

P2135 CHEVROLET Description
The throttle Position (TP) sensors 1 and 2 are potentiometer type sensors each with 3 circuits.

– A 5 – volt reference circuit.

– A low reference circuit.

– A signal circuit

The TP sensor are used to determine the throttle plate angle for various engine management systems. The control module provides each TP sensor a 5-volt reference circuit and a low reference circuit. The TP sensors then provide the control module whit signal voltage proportional to the throttle plate movement. Both TP sensor signal voltage are low at close throttle and increase as the throttle opens. When the control module detects that the TP sensor 1 signal and TP sensor 2 signals disagree or the signal voltages are outside the predetermined range, the P2135 code is set.

P0455 CHEVROLET Description
This diagnosis detects leaks in the Evaporative Emission System (EVAP) purge line using engine intake manifold vacuum. If pressure does not increase, the Engine Control Module (ECM) will check for leaks in the line between the fuel tank and EVAP canister purge volume control solenoid valve under the following vacuum test condition.

The vacuum cut valve bypass valve is opened to clear the line between the fuel tank and the EVAP canister purge volume control solenoid valve. The EVAP canister vent control valve will then be closed to shut the EVAP purge line off. The EVAP canister purge volume control solenoid valve is opened to depressurize the EVAP purge line using intake manifold vacuum. After this depressurization is implemented, the EVAP canister purge volume control solenoid valve will be closed.

CHEVROLET Technical Service Bulletin for Code P0455

What is this
Bulletin Number: SB-02-06-04-0371 Bulletin Date: 2010-09-01
Component:
Engine And Engine Cooling:exhaust System:emission Control
Summary
Chevrolet/gmc: check engine light on, fuel tank hard to fill, dtcs p0442, p0446, p0455 or p0449 set (replace evaporative emission (evap) vent valve solenoid assembly and add/relocate fileter box using service kit). *pe

As for the window going up and down slowly, Most likely the motor. If you hear grinding noise at same time it could be the regulator assembly but when you order one they come as a set, motor and regulator together most of the time.

1 thought on “2003 silverado 1500HD crewcab regular bed”

Freeautomechanic April 23, 2013 at 8:14 am
From all your codes, The throttle pedal codes are related to the TPS Sensor or wiring to/from it.
Possible causes
– Faulty electric throttle control actuator (TP sensor 1 and 2)
– Throttle Position Sensor harness is open or shorted
– Throttle Position Sensor circuit poor connection
– Faulty accelerator pedal position sensor
P2135 CHEVROLET Description
The throttle Position (TP) sensors 1 and 2 are potentiometer type sensors each with 3 circuits.
– A 5 – volt reference circuit.
– A low reference circuit.
– A signal circuit
The TP sensor are used to determine the throttle plate angle for various engine management systems. The control module provides each TP sensor a 5-volt reference circuit and a low reference circuit. The TP sensors then provide the control module whit signal voltage proportional to the throttle plate movement. Both TP sensor signal voltage are low at close throttle and increase as the throttle opens. When the control module detects that the TP sensor 1 signal and TP sensor 2 signals disagree or the signal voltages are outside the predetermined range, the P2135 code is set.
P0455 CHEVROLET Description
This diagnosis detects leaks in the Evaporative Emission System (EVAP) purge line using engine intake manifold vacuum. If pressure does not increase, the Engine Control Module (ECM) will check for leaks in the line between the fuel tank and EVAP canister purge volume control solenoid valve under the following vacuum test condition.
The vacuum cut valve bypass valve is opened to clear the line between the fuel tank and the EVAP canister purge volume control solenoid valve. The EVAP canister vent control valve will then be closed to shut the EVAP purge line off. The EVAP canister purge volume control solenoid valve is opened to depressurize the EVAP purge line using intake manifold vacuum. After this depressurization is implemented, the EVAP canister purge volume control solenoid valve will be closed.
CHEVROLET Technical Service Bulletin for Code P0455
What is this
Bulletin Number: SB-02-06-04-0371 Bulletin Date: 2010-09-01
Component:
Engine And Engine Cooling:exhaust System:emission Control
Summary
Chevrolet/gmc: check engine light on, fuel tank hard to fill, dtcs p0442, p0446, p0455 or p0449 set (replace evaporative emission (evap) vent valve solenoid assembly and add/relocate fileter box using service kit). *pe
As for the window going up and down slowly, Most likely the motor. If you hear grinding noise at same time it could be the regulator assembly but when you order one they come as a set, motor and regulator together most of the time.

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