Technical Service Bulletins

Caddy Gauge Lies

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Caddy Gauge Lies

This bulletin applies to 2004-2005 Cadillac CTS, CTS-V and SRX vehicles built prior to the following VIN breakpoints:

MODEL                     VIN BREAKPOINT




Some customers may experience an inaccurate fuel level gauge reading. In a small number of cases, the vehicle ran out of fuel when the gauge still indicated 1/8 tank.

The cause may be insufficient fuel transfer from the left fuel reservoir to the right fuel reservoir. The poor fuel transfer may be the result of one or both of the following:

  • The sender fuel feed (transfer pipe) has two anti-siphon holes in the middle of the pipe which are too large
  • A clogged/restricted transfer (jet) pump (part of the RH primary fuel tank module).

Do not replace the instrument panel cluster or the ECM unless diagnosis has determined them to be at fault.

Follow published diagnostics for any stored DTCs. If diagnosis leads you to look inside the fuel tank, determine if the vehicle came in as an as-failed condition. Pay particular attention to the quantity of fuel in the left and right reservoirs as the tank is lowered from the vehicle. Fuel remaining in the left reservoir and no fuel in the right reservoir is a good indication of poor fuel transfer. If the vehicle is not in a failed condition, it may be necessary to run the vehicle out of fuel to duplicate the concern.

Replace the sender fuel feed (transfer) pipe with P/N 10388380. This new pipe has one anti-siphon hole. Also, inspect the RH primary fuel tank module for a clogged/restricted transfer (jet) pump.

1. Remove the RH primary fuel tank module from the fuel tank.

2. Disconnect the electrical connector from the LH secondary fuel tank module.

3. Rotate the cam lock ring counter-clockwise using tool J45747.

4. Remove the cam lock ring from the fuel tank.

5. Carefully lift the LH secondary fuel tank module from the fuel tank only enough to access the transfer pipe.

6. Disconnect the transfer pipe from the LH module by pulling the lock mechanism down and away from the module.

7. Remove the transfer pipe.

8. Install the new (single hole) transfer pipe into the fuel tank.

9. Connect the transfer pipe to the LH secondary fuel tank module.

10. Install the cam lock to the fuel tank and rotate clockwise using J45747 until fully seated.

11. Connect the electrical connector to the LH secondary fuel module.

12. On the RH primary fuel tank module, inspect the jet pump by releasing the tab securing the pump to the module. Position the jet pump in order to shine a light at the rear, and look through the tube. The hole should be clear from debris and should not be black in color. If the jet pump shows signs of being plugged, replace the RH primary fuel tank module.

13. Install the RH primary fuel tank module into the fuel tank.

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