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Discussion Starter · #3 ·
bump please! This is all that is keeping me from selling my car. dealership said its the pump/sending unit assembly, so I bought it and put it in, I knew it wasnt the problem but they swore it was. Well it wasnt. Still reads empty. still have this code.
 

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bump please! This is all that is keeping me from selling my car. dealership said its the pump/sending unit assembly, so I bought it and put it in, I knew it wasnt the problem but they swore it was. Well it wasnt. Still reads empty. still have this code.
Here is the ALL DATA REPORT on that code. Hope it helps.

IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. See: Diagnostic Trouble Code Tests and Associated Procedures

CIRCUIT/SYSTEM DESCRIPTION
The fuel level sensor changes resistance in response to the fuel level. The powertrain control module (PCM) or the engine control module (ECM) monitors the signal circuit of the fuel level sensor in order to determine the fuel level. When the fuel tank is full, the sensor resistance is low and the PCM/ECM senses a low signal voltage. When the fuel tank is empty, the sensor resistance is high and the PCM/ECM senses a high signal voltage. The PCM/ECM uses the signal circuit of the fuel level sensor in order to calculate the percentage of remaining fuel in the tank. The PCM/ECM sends the fuel level percentage via GMLAN serial data circuit to the body control module (BCM). The BCM sends a GMLAN message to the instrument panel cluster (IPC) in order to display the fuel level percent on the fuel gage. The fuel information is also used for misfire and evaporative emission (EVAP) diagnostics.

CONDITIONS FOR RUNNING THE DTC

* The ignition is ON, with the engine running.
* The system voltage is between 9-16 volts .

CONDITIONS FOR SETTING THE DTC

* The sensor output is greater than 2.9 volts .
* The above condition is present for greater than 30 seconds .

ACTION TAKEN WHEN THE DTC SETS

* The fuel gage defaults to empty.
* The low fuel indicator illuminates.
* The PCM/ECM records the operating conditions at the time that the diagnostic test fails. The PCM/ECM displays the failure information in the Failure Records on the scan tool

CONDITIONS FOR CLEARING THE DTC

* The DTC becomes history when the conditions for setting the DTC are no longer present.
* The history DTC clears after 40 malfunction-free warm-up cycles.
* The PCM/ECM receives a clear code command from the scan tool.

CIRCUIT/SYSTEM VERIFICATION
With the scan tool installed and the ignition ON, the Fuel Tank Level Remaining parameter in the PCM/ECM EVAP Data List indicates a value at or greater than 4 percent .

CIRCUIT/SYSTEM TESTING

1. With the ignition OFF, disconnect C413.
2. Connect a 3-ampere fused jumper wire between the signal circuit of the fuel level sensor and the low reference circuit of the fuel level sensor on the male terminal side of the connector.
3. With the ignition ON, install a scan tool and observe the Fuel Tank Level Remaining parameter in the PCM/ECM EVAP Data List.

o If the Fuel Tank Level Remaining parameter indicates a value less than 98 percent, check the signal circuit and the low reference circuit of the fuel level sensor for an open, a high resistance or a short to voltage.
o If both the signal circuit and the low reference circuit tests normal, replace the PCM/ECM.
o If the Fuel Tank Level Remaining parameter indicates a value greater than 98 percent , check the signal circuit and the low reference circuit of the fuel level sensor for an open, for a high resistance or a short to voltage between C413 and the fuel level sensor.
o If both the signal circuit and the low reference circuit tests normal between C413 and the fuel level sensor, replace the fuel level sensor.

REPAIR INSTRUCTIONS

IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure. See: Verification Tests and Procedures

* Fuel Level Sensor Replacement for the 2.4L engine
* Fuel Sender Assembly Replacement for the 3.5L engine
* Fuel Level Sensor Replacement for the 3.9L engine
* Control Module References for the PCM/ECM replacement, setup, and programming
 

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This is exactly what I was looking for, Jet u got rep too.

This IMHO is the MOST important part

When the fuel tank is full, the sensor resistance is low and the PCM/ECM senses a low signal voltage. When the fuel tank is empty, the sensor resistance is high and the PCM/ECM senses a high signal voltage. The PCM/ECM uses the signal circuit of the fuel level sensor in order to calculate the percentage of remaining fuel in the tank. The PCM/ECM sends the fuel level percentage via GMLAN serial data circuit to the body control module (BCM). The BCM sends a GMLAN message to the instrument panel cluster (IPC) in order to display the fuel level percent on the fuel gage. The fuel information is also used for misfire and evaporative emission (EVAP) diagnostics.

What I would do is take the OLD Fuel Pump/sending unit assembly and see if you can get the gas gauge to move. If that doesn't work Check The Relay, it would appear your car was in a front end crash the fuse box could have been damged.
 

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Unhook the battery to clear the code. you changed the sending unit?
Sounds like a stuck float if you changed out the sensor.

Was it hit from behind?
 

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Discussion Starter · #12 ·
I replaced the whole pump/sending unit assembly. With it out of the tank and plugged in, I moved the float and had someone cycle the ignition watching the fuel gauge, nothing changed, its sending the correct reading out of the sending unit, but its not making it to the gauge. The car was hit in the front, shattered the fuse box, so I replaced it with all new fuses and relays.
 

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Damn that sux...

Will trace every wire coming from the Sending unit to the front of the car, There has to be kink or short somwhere.

Also for kicks...

Is the Check engine light on? I know you said Code, but to even get that code i'm assuming you had a scanner...

Have you pulled the cluster? perhaps theres an issue there?
 

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just out of curiosity is the car drivable now and this is one of the last issues? id be into seein some pics of ur progress, if youve got that car wrokin and lookin good again props to you :bigok:
 

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I replaced the whole pump/sending unit assembly. With it out of the tank and plugged in, I moved the float and had someone cycle the ignition watching the fuel gauge, nothing changed, its sending the correct reading out of the sending unit, but its not making it to the gauge. The car was hit in the front, shattered the fuse box, so I replaced it with all new fuses and relays.
Sending unit is sending out correct voltage but it's not getting to the gauge..correct? I assume you checked wiring going to the insturmant cluster..correct?

You could slave the wiring into the harness for the insturment cluster. That would bypass all the wiring in between. You would just need some long jumer wires to reach the dash from the sending unit.

If you get no results slaving wires in and all else checks good I would say it may be the gauge it self.

Are you getting correct voltage at the plug for the instrument cluster?
 

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Yeah my money is on that cluster OR some issue with an realy under the hood, some thing is grounding out or a ground is gone, Also check your ground straps.
 

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Discussion Starter · #18 ·
Yeah my money is on that cluster OR some issue with an realy under the hood, some thing is grounding out or a ground is gone, Also check your ground straps.
I replaced the whole fuse box, so all new relays and fuses, new engine wiring harness, all grounds are good, I took the cluster out, all appears to be good. Dealership wants $100 bucks to just pull it in the shop, no thanks.
 
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