GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2003 🢒 Monte Carlo 🢒 Engine 🢒 Engine Controls - 3.8L 🢒 DTC P1554

Circuit Description

The PCM has the ability to inhibit cruise control if conditions are detected which would make cruise control operation undesirable.

The PCM will interrupt the ground on the cruise inhibit circuit to request that cruise control be disengaged.

Conditions for Running the DTC

The ignition is On

The PCM is commanding the cruise control module to inhibit cruise control operation.

Conditions for Setting the DTC

The PCM detects a cruise engaged signal from the cruise control module, while inhibiting cruise control operation.

Action Taken When the DTC Sets

The PCM stores the conditions present when the DTC set as Failure Records data only.

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 receives a clear code command from the scan tool.

Step

Action

Yes

No

Schematic Reference: Cruise Control Schematics

1

Did you perform the Cruise Control Diagnostic System Check?

Go to Step  2

Go to Diagnostic System Check - Cruise Control

2
  1. Install a scan tool.
  2. Turn the ignition ON, with the engine OFF.
  3. With the scan tool, observe the Cruise Active parameter in the PCM Engine Data 1 data list.

Does the Cruise Active parameter display Engaged?

Go to Step 3

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

3
  1. Turn the ignition OFF.
  2. Disconnect the cruise control module.
  3. Turn the ignition ON, with the engine OFF.
  4. Using the scan tool, observe the Cruise Active parameter.

Does the Cruise Active parameter display Engaged?

Go to Step 4

Go to Step 5

4

Test the cruise control engaged signal circuit for a short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 9

Go to Step 6

5

Inspect for poor connections at the harness connector of the cruise control module. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 9

Go to Step 7

6

Inspect for poor connections at the harness connector of the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 9

Go to Step 8

7

Replace the cruise control module. Refer to Cruise Control Module Replacement .

Did you complete the replacement?

Go to Step 9

--

8

Important: Program the replacement PCM.

Replace the PCM. Refer to Powertrain Control Module Replacement in Engine Controls-3.4L or to Powertrain Control Module Replacement in Engine Controls-3.8L.

Did you complete the replacement?

Go to Step 9

--

9
  1. Use the scan tool in order to clear the DTC(s).
  2. Operate the vehicle within the conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

Go to Step 2

System OK