20 Most Recent 2003 Chevrolet Express Questions & Answers

If your dealership couldn't fix it, I'm not sure how to help?
I found this info in my database. I have to tell you these databases are not always correct. Hope you can read it or magnify. When I saw it mention those two filters, it made me wonder? I can't diagnose this from here.
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2003 Chevrolet... | Answered on Mar 09, 2017

You could have anyone of a number of different problems . I know your year vehicle falls in the range of GM instrument culster problems . There are little stepper motors ( electric motors ) that make the gauges move . There could be DTC'S - diagnostic trouble codes stored in the instrument cluster . An you have to know how the instrument cluster knows how much to move the needles on the gauges . All the input sensors to the PCM/ECM - engine computer vehicle speed sensor , fuel pressure , oil pressure , etc... All the modules on the truck are hooked together on a serial data communication network .The PCM/ECM sends this information out on the data bus for the other moduels that need the info .
Engine Oil Pressure (EOP) Gage
The IPC displays the engine oil pressure on the analog EOP gage as determined by the PCM. The PCM monitors the signal circuit of the EOP sensor. When the EOP sensor resistance is high, the engine oil pressure is high. When the EOP sensor resistance is low, the engine oil pressure is low. The IPC receives a class 2 message from the PCM indicating the engine oil pressure. The EOP gage defaults to 0 kPa (0 psi) when the following conditions occur:
• The PCM detects a malfunction in the engine oil pressure sensor signal circuit. Refer to Diagnostic System Check - Instrument Cluster .
• The IPC detects a loss of class 2 communication with the PCM.
The IPC displays the vehicle speed on the analog speedometer based on the vehicle speed signal from the PCM. The PCM converts the data from the vehicle speed sensor to a 4000 pulses/mile signal. The IPC uses the vehicle speed signal circuit from the PCM in order to calculate the vehicle speed.
The powertrain control module (PCM) creates the vehicle speed signal by pulsing the signal circuit to ground at a rate of 4K PPM. The instrument panel cluster (IPC) converts the 4K PPM signal to a speedometer position. The IPC also receives a class 2 message from the PCM indicating the vehicle speed. The IPC uses this class 2 message for diagnostic purposes.
There could be up to twenty different DTC'S stored ,here is an a for instance
DTC B1365
The instrument panel cluster (IPC) uses the ignition 0 voltage circuit in order to supply voltage to various indicators and gages. The IPC also receives a class 2 message from the serial data gateway module (SDGM) indicating the current power mode. Your best bet would be to take your vehicle to the Dealer or an ASE certified independant repair shop .

2003 Chevrolet... | Answered on Dec 21, 2015

The fact that the rear works fast means that the connection from flasher to bulb to chassis isn't complete. Common problem is that the connection from the socket to chassis isn't good, but the wire may be bad, too. Use a meter or test probe to see if power is getting to the socket. If so, then it's likely the chassis connection.

2003 Chevrolet... | Answered on Jun 10, 2015

tow vehicle to a shop and have a mechanic look at it

2003 Chevrolet... | Answered on Apr 23, 2015

on reservoir tank or a/c drier tank on right side in the engine compartment is a silver tank

2003 Chevrolet... | Answered on Apr 23, 2015

bad bulb or relay

2003 Chevrolet... | Answered on Apr 23, 2015

check the fuse

2003 Chevrolet... | Answered on Feb 03, 2015

Rust build up is commonly found on the hubs sandwiched by the rotors/hubs

2003 Chevrolet... | Answered on Sep 12, 2014

Here is the cover removal diagram. 4c380cb0-6b0b-403d-86c6-e0e4af30cec0.jpg

2003 Chevrolet... | Answered on Sep 06, 2014

with the key on/engine off floor the gas pedal 3 times the hold it down till the change oil light start blinking and go away,some times it take more than 10 sec,if it didn't work try it again,some times you have to try few times,to get it done

2003 Chevrolet... | Answered on Aug 17, 2014

It can only be an internal computer problem. I would find the BCM and open it up. Make sure there isn't any corrosion. If there is, use a firm toothbrush or a soft brass brush to clean it. Then before you reinstall it, wrap it in plastic or use a ziplock bag so water can't get to it. GM is bad about putting BCM's under cup holders or under the A/C plenum where water can get to them..

2003 Chevrolet... | Answered on Aug 11, 2014

Security has been activated. Do a relearn. You have to have it on a battery charger as it takes about 30 minutes to do. Relearn is= turn the key on (don't start) for ten minutes. Turn it of for 30 seconds. Do this three times. After the third time it should have learn the new key. And will start. If you mess up at any time, you will have to start over from the beginning.

2003 Chevrolet... | Answered on Jun 08, 2014

I am assuming you mean the turn signal switch was replaced in the hopes the problem was the dimmer switch.
The headlight switch sends a ground signal to the body computer which controls the high and low headlight relays. It sounds like you have a bad connection in the wiring harness somewhere, especially if the high and low beams blink.

2003 Chevrolet... | Answered on Mar 12, 2014

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