Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 540 (CRUISE CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESCRUISE CONTROL INDICATOR ALWAYS ON (3.4L)
1999 GMC Forward Control 5.7 R, Automatic
Cruise Control Indicator Always On (3.4L)
1999 GMC Forward Control 5.7 R, AutomaticSECTION Cruise Control Indicator Always On (3.4L)
WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
Cruise Control Indicator Always On (3.4L)
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Cruise Control Schematics | |||
| 1 | Did you perform A Diagnostic System Check-Cruise Control? | Go to Step 2 | Go to Diagnostic System Check - Cruise Control (3.4L) or Diagnostic System Check - Cruise Control (3.6L) |
| 2 |
|
Go to Step 3 | Go to Step 5 |
| 3 | With a scan tool, observe the cruise parameter in the powertrain control module (PCM) data list. Does the scan tool indicate that the cruise control is engaged? |
Go to Step 4 | Go to Step 5 |
| 4 | Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 8 | Go to Step 6 |
| 5 | Inspect for poor connections at the harness connector of the instrument panel cluster (IPC). Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 8 | Go to Step 7 |
| 6 |
IMPORTANT:
The replacement PCM must be programmed. Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement
in Engine Controls-3.4L.Did you complete the replacement? |
Go to Step 8 | - |
| 7 | Replace the IPC. Refer to Instrument Panel Cluster (IPC) Replacement
in Instrument Panel, Gages, and Console. Did you complete the replacement? |
Go to Step 8 | - |
| 8 | Operate the system in order to verify the repair. Did you correct the condition? |
System OK | Go to Step 2 |
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.