Question about Chevrolet 1500

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Cruise control problem on my 96 chevy 1500 deisel 6.5. At first it started disengageing itself kinda like you were tapping the brake, I would turn it back on then shortly later it would disengage. Now it won't even engage. Any ideas?

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  • Kevin kinney May 02, 2010

    As instructed I checked fuses 1, 6, and 18. All are fine, next suggestion please. Thanks, Kevin

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  • 1,297 Answers

Many possibilities, but lets start easy...
check the following fusses, 1 (20A), 6 (10A) and 18 (10A)

from there we need to test the switch and the inputs from the switch to the PCM, but that will be a little tougher and you will need a DVOM


keep me posted



Posted on Apr 24, 2010

  • Sean Reisdorf
    Sean Reisdorf May 02, 2010

    next you will need a scan tool to monitor the PID's during the concern to confirm that the BCM is not sensing a BOO input

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I own a 2005 GMC Canyon Five CYL and the cruise control stopped working last niight. You push the button and no cruise. I checked the fuse and it is ok I exchanged with another 10AMP and no change still...


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Cruise Control Disengaged
The powertrain control module (PCM) disengages the cruise control operation based on the signals from the following switches:

* The stop lamp switch
* The TCC brake/cruise release switch
* The clutch release switch, if equipped
* The cruise control On/Off switch

The TCC brake/cruise release switch and the stop lamp switch are mounted on the brake pedal bracket. When the brake pedal is applied, the normally closed TCC brake/cruise release switch opens and the normally open stop lamp switch closes. The PCM detects a low signal voltage on the TCC brake/cruise release switch signal circuit and a high signal voltage on the stop lamp switch signal circuit. When the clutch pedal is applied, the normally closed clutch release switch opens and the PCM detects zero voltage on the CCP switch signal circuit. The vehicle speed stored in the memory of the PCM will be erased when the cruise control On/Off button is turned OFF, or the ignition switch is turned OFF.

The Cruise Control System will disengage when the PCM detects that a driver override function has been active for approximately 60 seconds .

When the Cruise Control System is disengaged, the PCM sends a class 2 message to the instrument panel cluster (IPC) in order to deactivate the cruise control indicator.

Cruise Control Inhibited
The powertrain control module (PCM) inhibits the cruise control operation when any of the following conditions exist:

* A cruise control related DTC has been set.
* The vehicle speed is less than 40.2 km/h (25 mph) .
* The vehicle is in PARK, REVERSE, NEUTRAL, or 1st gear.
* The engine RPM is too low.
* The engine RPM is too high, with fuel cut off.
* The vehicle speed is too high, with fuel cut off.
* The system voltage is not between 9 volts and 16 volts .
* The Traction Control System (TCS) is active for more than 2 seconds .

Thank you for using Fixya and start with replacing the stop lamp switch. Even though the brake light work, it;s been known for that switch to cause your issue. that's way there was a recall for it.

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