Question about 2000 Chevrolet Astro

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Chevy astro 2001, the fuel indicator doesn't work, shows low fuel and the tank is full, shows the battery sign, and the shift gear light dissappeared from the PRND12. Can you help me with this instrument cluster problem

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Your fuel sender unit has a problem, maybe just a broken/loose connection or wire. the bulb probably burnt in the cluster, replace

Posted on Jan 03, 2011

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Posted on Jan 02, 2017

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Shift indicator lights up but does not display which gear I am in.


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1 Answer

The instrument cluster has been rebuilt, but still doesn't work on a 2000 Chevy Suburban 5.3. Fuses OK What else?


With the instrument cluster pulled ,but still connected to electrical connector , Check B+ voltage an ground's . Loaded circuit testing , do you know what that is ? Video's on youtube .An do you know where the gauges get there info. from ? The instrument cluster is hooked to the class 2 serial data network , this is a communication network for the control modules . PCM / ECM - engine computer , BCM - body control module , SRS , air bag module , ABS , etc.... They all share info. on this network .
Fuel Gauge
The fuel gauge is an analog device that is located in the instrument cluster. The instrument cluster operates the fuel gauge by the class 2 serial data messages from the VCM/PCM. The fuel gauge indicates the quantity of fuel in the tank when the ignition switch is in the RUN position. When the ignition switch is turned to the OFF, LOCK, START, or ACC position, the pointer may come to rest at any position.
The VCM/PCM measures voltage from a variable resistor inside the fuel tank that is controlled by a float. When the fuel tank is full and the ignition switch is in the RUN position, the resistance is high. The VCM/PCM interprets this signal and sends a message to the instrument cluster indicating the percentage of fuel in the tank over the class 2 serial data line. The fuel gauge indicator then moves to the maximum position or FULL on the gauge face. When the fuel tank is empty, resistance is low. The VCM/PCM interprets this signal and sends a class 2 serial data message to the instrument cluster. The fuel gauge indicator then moves to the minimum position or EMPTY on the gauge face. Failures detected by the PCM/VCM in the fuel gauge signal sends the gauge to EMPTY.

PRNDL Indicator (Park Reverse Neutral Drive Low)
The PRNDL display is a class 2 serial data message to the instrument cluster from the PCM/VCM. The PRNDL display is a vacuum florescent (VF) display which displays the fixed gear position of P, R, N, D, 3, 2, 1 surrounded by a moveable square flag in order to indicate the selected gear position. The position of the moveable square flag is sent to the instrument cluster from the transmission range switch over the class 2 serial data line. The transmission range switch and the neutral safety back up (NSBU) switch operate separately but are incorporated into one part. If the vehicle is equipped with a column shift steering column it will also have a park position switch. The park position switch (if equipped) must also be CLOSED in order for the instrument cluster to display the PARK position. Since the system is entirely electronic, there is not any internal adjustment. The PRNDL display will operate as follows:
• The PRNDL display will display the PARK position when a class 2 serial data message is received from the PCM/VCM indicating the transmission is in the PARK position and for vehicles which have a column shift on the steering column, the park position switch must also be CLOSED (low input).
• The PRNDL display will display a gear position if a class 2 serial data message from the PCM/VCM is received indicating the gear position of the transmission.
• The moveable square flag will not appear on the instrument cluster in order to show no gear was selected when the instrument cluster does not receive a class 2 serial data message from the PCM/VCM within 5 seconds of entering the UNLOCK or the RUN position.
Refer to Engine Controls or Transmission/Transaxle for more information about the PRNDL indicator.


Hooking up a GM tech 2 scan tool an checking for DTC'S - diagnostic trouble code's would be a good first step in the diagnostic procedure .
Data Link Communications Circuit Description
The serial data line is the means by which the microprocessor controlled modules in the vehicle communicate with other control modules and the scan tool.
The control modules on the class 2 data line are as follows:
• Body control module (BCM)
• Instrument cluster (IPC)
• Automatic transfer case (ATC) control module
• Vehicle control module (VCM)
• Powertrain control module (PCM)
• Inflatable restraint sensing and diagnostic module (SDM)
• Electronic Brake Control Module (EBCM)
• Suspension Control Module (SCM)
• HVAC Control Module

Your best bet mite be to take it to a qualified repair shop .

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2 Answers

2001 z71engine shut down. low fuel light no gear indicator showing in dash no spark no fuel pressure. has full tank, engine cranks, fuel gauge is reading empty, has been missing ocasionally. put scanner on...


It sounds like a shorted class2 data line to me. Is the scanner giving you U-codes? (U1000, U1042, etc.) If you are getting U-codes that is your problem.

Jan 05, 2011 | 2001 Chevrolet Silverado 1500

1 Answer

1995 Chevy Astro rough idle after choke goes off and engine is at full operating temperature, also no check engine light.


Inspect/replace air filter.
Fill the gas tank to above 3/4 and add Lucas FUELSYSTEM CLEANER.
Ran on the highway for 10+ miles.

Monitor is the rough idle condition is getting worst on below 1/4 tank.
Change fuel filter and check fuel pressure.
Most failing/weak fuel pump will not work well below 1/4 tank mark.
It will fail in a HOT DAY.

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2 Answers

2001 Chevy Impala gas guage incorrect


The level sensor is bad. They are easy to do. You don't have to pull the fuel tank down. There is an acsess hole in the trunk. Look in the rear of the trunk at the rear of the seats. You will notice there is a spot in the middle that the capet comes together, Pull them apart and there is metal plate with some 10mm nuts, pull that off and your fuel pump is there, remove and replace the sensor.
Also there will the a code in the pcm. you will need to clear it to pass emissions

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1 Answer

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sounds to me that the gas tank is not grounded or 12v was supplied to sender unit wire and damaged fuel gauge

run a ground wire from battery neg (black) post to clean metal on tank

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1 Answer

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It's either a faulty tank sensor or a faulty fuel indicator light. Get the fuel indicator light checked first.

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