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 MANUALSGMC2009CANYON 4D PICKUP, 2.9 9REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 37 (ANTI-LOCK BRAKE SYSTEM, TRACTION CONTROL SYSTEM & STABILITY CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC C0240 OR P0856CIRCUIT/SYSTEM TESTING
2009 GMC Canyon 4D Pickup, 2.9 9
Circuit/System Testing
2009 GMC Canyon 4D Pickup, 2.9 9SECTION Circuit/System Testing
WARNING: This page is about a different car, the 2008 Isuzu i-370, 2008 Isuzu i-290, 2008 GMC Canyon, and 2008 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
It is recommend that the defective components be replaced, and not the complete brake master cylinder assembly.
- Use a scan tool in order to clear the DTCs. Cycle the ignition to OFF and then start the engine. A current failure will set a DTC.
- If the DTC does not reset, go to Diagnostic Aids Diagnostic Aids.
- Ignition OFF, disconnect the harness connector at the EBCM.
- Ignition ON, test for 4.8-5.2 volts between the signal circuit terminal 23 and ground.
- If less than the specified range, test the signal circuit for a short to ground or an open/high resistance.
- If greater than the specified range, test the signal circuit for a short to voltage.
- If the circuits test normal, replace the ECM. If DTC resets, replace the EBCM.
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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.