DTC P0604. Cadillac Catera 2001

For 1990-2009 cars only

Makes 🢒 Cadillac 🢒 2001 🢒 Catera 🢒 DTC 🢒 DTC P0604

The engine control module (ECM) performs an internal self-test on the random access memory (RAM) or the read/write memory.

Engine cranking

The internal RAM test fails.

•	The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.

•	The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.

•	The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.

•	A current DTC, Last Test Failed, clears when the diagnostic runs and passes.

•	A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.

•	Clear the MIL and the DTC with a scan tool.

Step

Action

Yes

Did you perform the Diagnostic System Check-Engine Controls?

Important:

•	Perform the idle learn procedure when replacing the ECM or throttle body.

•	This vehicle is equipped with a theft deterrent system that interfaces with the engine control module (ECM). Program the new ECM with the frequency code of the theft deterrent module that is currently on the vehicle.

Did you complete the action?

Use the scan tool in order to clear the DTCs.
Turn OFF the ignition for 30 seconds.
Start the engine.
Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC run and pass?

With a scan tool, observe the stored information, Capture Info.

Does the scan tool display any DTCs that you have not diagnosed?

System OK