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 MANUALSOLDSMOBILE2004BRAVADA AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 21 (ANALOG INSTRUMENT PANELS)SELF-DIAGNOSTIC SYSTEMENGINE CONTROLS DIAGNOSTIC SYSTEM CHECK
2004 Oldsmobile Bravada AWD
Engine Controls Diagnostic System Check
2004 Oldsmobile Bravada AWDSECTION Engine Controls Diagnostic System Check
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2001 GMC Savana Special, 2001 GMC Savana Camper Special, 2001 GMC Savana, 2001 Chevrolet RV Cutaway, and 2001 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
DO NOT perform this diagnostic if there is not a driveability concern, unless another procedure directs you to this diagnostic. Before proceeding with the diagnosis, search for applicable service bulletins. Unless a diagnostic procedure instructs you, DO NOT clear DTCs. If starting system condition exists, go to ENGINE ELECTRICAL SYSTEM DIAGNOSTIC SYSTEM CHECK
. Ensure battery is fully charged. Ensure battery cables are clean and tight. Ensure PCM grounds are clean, tight, and in correct location.
- Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC), located below steering column. See Figure . Turn ignition switch to RUN position. If scan tool powers up, go to next step. If scan tool does not power up, go to TEST A: SCAN TOOL DOES NOT POWER UP in SYSTEM TESTS article in BODY CONTROL MODULES.
- Using scan tool attempt to communicate with following modules:
- Vehicle Theft Deterrent (VTD) module
- Instrument Panel Cluster (IPC)
- Electronic Brake Control Module (EBCM)
- HVAC module
If scan tool communicates with all specified modules, go to next step. If scan tool does not communicate with specified modules, see TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE in SYSTEM TESTS article in BODY CONTROL MODULES.
- Attempt to start engine. If engine starts and idles, go to next step. If engine does not start, diagnose no start by symptom. Go to TROUBLESHOOTING - NO CODES - TRUCKS article in ENGINE PERFORMANCE.
- Select DISPLAY DTCs from PCM, VTD, EBCM, IPC, and HVAC modules. If any DTCs are retrieved, go to next step. If no DTCs are retrieved, go to step 9 .
- Select CAPTURED INFO to store DTCs in memory, then go to next step.
- If scan tool does not display any DTCs which begin with "U", go to next step. If scan tool displays DTCs which begin with "U", see TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE in SYSTEM TESTS article in BODY CONTROL MODULES.
- If scan tool does not display DTC P0601, P0602, P0604 or P1683, go to next step. If scan tool displays DTC P0601, P0602, P0604 or P1683, perform appropriate test. See appropriate SELF-DIAGNOSTICS article.
- If scan tool displays DTC P0562, P0563, P1637 or P1638, see appropriate STARTERS or GENERATORS & REGULATORS article in STARTERS & CHARGING SYSTEMS. If scan tool does not display DTC P0562, P0563, P1637 or P1638, diagnose any other DTCs that are present. See DIAGNOSTIC TROUBLE CODE DEFINITIONS in BODY CONTROL MODULES.
- If concern is not with automatic transmission, go to next step. If customer's concern is with automatic transmission, see AUTOMATIC TRANSMISSION DIAGNOSTIC SYSTEM CHECK. See TROUBLESHOOTING - NO CODES - TRUCKS article in ENGINE PERFORMANCE. Repair as necessary.
- If customer's concern is not with inspection and maintenance testing, go to next step. If customer's concern is with inspection and maintenance testing, go to INSPECTION/MAINTENANCE SYSTEM CHECK under INSPECTION/MAINTENANCE PROCEDURES in appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
- Diagnose engine control system by symptom. See TROUBLE SHOOTING - NO CODES - TRUCKS article in ENGINE PERFORMANCE. If concern still exists, diagnose intermittent condition. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES - TRUCKS article in ENGINE PERFORMANCE.
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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.