Leak Test Fails
WARNING: This page is about a different car, the 2007 GMC Sierra, 2007 GMC Cab & Chassis Sierra, 2007 Chevrolet Silverado, and 2007 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
If the pressure drop is more than 34 kPa (5 psi) in 15 seconds, the leak test has failed. Perform the following procedure:
- Inspect for air leaks using a pump spray bottle to apply a soapy solution to the pipes/hoses, charge air cooler hose connections, and charge air cooler core. Observe for bubbles.
- Replace or tighten the affected component as necessary.
- Retest the CAC system. If no other leaks are found, assemble the vehicle and clear the DTC information with a scan tool.
- Perform a DPF Service Regeneration with a scan tool. Refer to Exhaust Particulate Filter Cleaning (DPF Service Regeneration) or Exhaust Particulate Filter Cleaning (DPF Regeneration Enable)