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Matt J
Matt J, Pontiac Mechanic
Category: Pontiac
Satisfied Customers: 1399
Experience:  ASE Certified Master Tech,10+ Yrs Experince All Makes,Advance Training On All GM Makes
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i bought a pontiac montana mini van and the gas gauge is off

Resolved Question:

i bought a pontiac montana mini van and the gas gauge is off i toped it off with gas it took 12 gal. and turned the van on and the gas gauge went to e and the low fuel light came on. i was told that its probaly abad ground. how do i fix it?
Submitted: 7 years ago.
Category: Pontiac
Expert:  Matt J replied 7 years ago.

Hello my name is XXXXX XXXXX I will be more than happy to assist you.


Could you tell me what Year your vehicle is?

Customer: replied 7 years ago.
Expert:  Matt J replied 7 years ago.

There are 3 possibilities; the first one is described in the GM Service Bulletin below. The other two parts that could be the cause is the Fuel Level Sender or the Instrument Cluster.

Start with the bulletin first, if everything checks out then Fuel Level Sender will have to be check out next.


Subject:Hard/No Start, Fuel Gauge Inop/Fluctuates, SES/Check Engine Light On, ABS Warning Light On, TCS Warning Light On, TCS Activation, Service Traction System Message, All-Wheel Drive Disable Message, DTCs #01-08-45-005E - (08/29/2006)


Models:2002-2006 Buick Rendezvous
2005-2007 Buick Terraza
2000-2005 Chevrolet Venture
2005-2007 Chevrolet Uplander
2000-2004 Oldsmobile Silhouette
2000-2005 Pontiac Montana
2001-2005 Pontiac Aztek
2005-2007 Pontiac Montana SV6
2005-2007 Saturn Relay


This bulletin is being revised to add 2007 model year. Also, additional information was added to the Important statement. Please discard Corporate Bulletin Number 01-08-45-005D (Section 8 - Body and Accessories).


Some customers may comment on one or more of the following conditions:

Engine is hard to start
Engine will not start
Engine starts then stalls
Fuel gauge is inoperative or fluctuates
Service Engine Soon/Check Engine light is illuminated
ABS Warning Light is illuminated
TCS Warning Light is illuminated
TCS activation
Service Traction System message displayed
All-Wheel Drive Disable message displayed

These conditions may be intermittent. Upon investigation, the technician may find various DTCs set.


This condition may be due to water leaking into the interior of the vehicle, and/or spread terminals, at connector C305 that is located on the floor to the rear of the driver's seat. This connector is not sealed from the inside of the vehicle and water may enter the connector causing the terminals to become corroded. Also, the female terminals of the connector may have become spread apart causing an intermittent poor connection.



Inspect the terminals at connector C305 for corrosion or spreading before replacing the fuel module or resistor card kit. Terminals can be accessed from underneath the vehicle.
Do not attempt to repair any spread female terminals as this will result in a return repair. The female terminal must be replaced.
If the terminals show signs of corrosion, determine the source of the water leak first and repair the water leak before repairing the terminals in connector C305. Refer to Corporate Service Bulletin Number 01-01-38-009A to determine a potential source for water in the vehicle interior.


Repair any corroded and/or spread female terminals in connector C305. Refer to Repairing Connector Terminals in the Wiring Systems sub-section of the appropriate service information.

Customer: replied 7 years ago.
where is the c305 actually located?
Expert:  Matt J replied 7 years ago.

Sorry I didn't notice the picture did not post.



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