DTC P2067. Cadillac CTS 2009

For 1990-2009 cars only

Makes 🢒 Cadillac 🢒 2009 🢒 CTS 🢒 DTC 🢒 DTC P2067

Diagnostic Instructions

•	Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

•	Review Strategy Based Diagnosis for an overview of the diagnostic approach.

•	Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC P2067: Fuel Level Sensor 2 Low Voltage

Diagnostic Fault Information

Circuit	Short to Ground	High Resistance	Open	Short to Voltage	Signal Performance
Fuel Level Sensor 1 Signal	P0462	1	P0463	P0463	P0461
Fuel Level Sensor 2 Signal	P2067	1	P2068	P2068	P2066
Fuel Level Sensor Low Reference	--	1	P0463 P2068	P0463 P2068	P0461 P2066
1. Fuel Gage Inaccurate or Inoperative

The primary fuel level sender and the secondary fuel level sender changes resistance based on fuel level. The engine control module (ECM) monitors the signal circuits of the primary fuel level sender and the secondary fuel level sender in order to determine the fuel level. When the fuel tank is full, the resistances of both fuel level senders are low and the ECM senses a low signal voltage on both the signal circuits of the primary fuel level sender and the secondary fuel level sender. When the fuel tanks are empty, the resistances of the fuel level senders are high and the ECM senses a high signal voltage. The ECM uses the signal circuits of the primary fuel level sender and the secondary fuel level sender in order to calculate the percentage of remaining fuel in the tank. The ECM sends the fuel level percentage via serial data circuit to the instrument cluster in order to control the fuel gage.

Conditions for Running the DTC

•	The engine is running.

•	The system voltage is between 10-18 volts.

Conditions for Setting the DTC

•	The secondary fuel level sensor signal is less than 0.35 volt.

•	The above condition is present for about 60 seconds.

Action Taken When the DTC Sets

•	The fuel gage defaults to empty.

•	The low fuel indicator illuminates.

•	The ECM records the operating conditions at the time that the diagnostic test fails. The 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.

Reference Information

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON, observe the scan tool Fuel Level Sensor parameter. The reading should be between 0.9 - 2.5 volts.

Circuit/System Testing

Ignition OFF, disconnect the harness connector at the secondary fuel level sensor.
Ignition ON, scan tool installed, verify that the scan tool Fuel Level Sensor Right Tank parameter is greater than 4.5 volts.

⇒	If less than the specified range, test the secondary signal circuit terminal A for a short to ground. If the circuit tests normal, replace the ECM.

If all circuits test normal, perform the fuel level sensor component test before replacing the secondary fuel level sensor.

Component Testing

Ignition OFF, remove the secondary fuel level sensor.
While sweeping the secondary fuel level sensor through its full range of motion, test for a minimum value less than 41 ohms and a maximum value greater than 119 ohms between signal terminal A and the low reference terminal D.

⇒	If not within the specified range, replace the secondary fuel level sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•	Secondary Fuel Tank Module Replacement for the 3.6L engine

•	Fuel Level Sensor Replacement - Left Side for the 4.8L, 5.3L, 6.0L, 6.2L or 7.0L engine

•	Control Module References for the ECM replacement, setup, and programming