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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1315 (CRUISE CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC 042TEST DESCRIPTION
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Test Description

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Test Description
WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 2:  This step tests the condition of the vehicles charging system.
  2. 3:  This step tests the condition of the power feed circuit to the module.
  3. 4:  This step tests for a faulty cruise control module.
DTC 042

Step Action Value(s) Yes No
Schematic Reference: Cruise Control Schematics 
1 Did you perform the Diagnostic System Check - Cruise Control  ? - Go to Step 2  Go to Diagnostic System Check - Cruise Control 
2 
  1. Start the engine.
  2. Turn the headlamps on to high beams.
  3. Set the blower fan speed to high.
  4. Measure the voltage between the positive and negative battery terminals.
Is the voltage within the specified range?		 10-14 V Go to Step 3  Go to Step 6 
3 
  1. Turn the ignition switch to the lock position.
  2. Disconnect the cruise control module connector.
  3. Re-start the engine.
  4. Measure the voltage between cavity 2 and chassis ground
Is the voltage within the specified range?		 10-14 V Go to Step 4  Go to Step 5 
4 
  1. Turn the headlamps off.
  2. Turn the blower off.
  3. Turn OFF the ignition.
  4. Reconnect the cruise control module.
  5. Test drive the vehicle and engage the cruise control to verify the operation.
  6. Stop the vehicle.
  7. Install a scan tool.
  8. Turn ON the ignition, with the engine OFF.
  9. Pull the cruise control switch to the CANCEL position and hold.
  10. While holding the cruise control switch to the CANCEL position, push the cruise control ON switch 5 times within 3 seconds.
  11. Check that the CRUISE indicator lamp flashes rapidly. This confirms that any flash codes have been cleared.
Does the CRUISE indicator lamp flash the same trouble code?		 - Go to Step 5  Go to Step 9 
5 Repair the high resistance in the BLK/WHT wire between the module and junction block 2. Refer to Wiring Repairs in Wiring System.
Is the repair complete?		 - Go to Step 10  -
6 In order to diagnose a low charging condition, refer to Charging System Test in Engine Electrical.
Is the action complete?		 - Go to Step 10  -
7 Inspect for poor connections at the harness connector of the cruise control module. 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 10  Go to Step 8 
8 Replace the cruise control module. Refer to Cruise Control Module Replacement .
Is the repair complete?		 - Go to Step 10  -
9 Malfunction is not present at this time. Refer to diagnostic aids for additional information.
Is the action complete?		 - System OK -
10
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Pull the cruise control switch to the CANCEL position and hold.
  4. While holding the cruise control switch to the CANCEL position, push the cruise control ON switch 5 times within 3 seconds.
  5. Check that the CRUISE indicator lamp flashes rapidly. This confirms that any flash codes have been cleared.
Does the CRUISE indicator lamp flash the same trouble code?		 - Go to Step 2  System OK
RENDER: 1.0x

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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.