PIP4925B
Service Bulletin Details
Public Details for: PIP4925B
This preliminary information document communicates a tip on the way to diagnose possible induction or exhaust air leaks using the evaporative emission cart smoke machine and ultrasonic leak detectortools.
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Bulletin No.: PIP4925B Published date: 12/3/2018 Preliminary Information PIP4925B SES Light with Fuel Trim and or Oxygen Sensor Codes Models Brand: All Model: All VIN: Model Years: 2000 - 2019 from All to All Engine: All (Gasoline Engines Only) Transmissions: All Supersession Statement This PI was superseded to update Model Years and add diagnostic recommendations. Please discard all copies of PIP4925A The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI. Condition / Concern A customer may comment the vehicle has an SES light on. Initial diagnosis may display any of these fuel trim and/or O2 sensor related codes, P0101, P0137, P0138, P0140, P0141,P0157, P0158, P0160, P0161, P0171, P0174, P0420, P0430, P1174, P1175, P2096, P2097, P2098, P2099, P2177, P2178, P2179, P2180, P2187, P2188, P2189, P2190. P2270, P2271, P2272, P2273. Recommendations / Instructions If normal SI diagnostics does not lead to a resolution and an intake vacuum leak or an exhaust leak is suspected, the use of the J41413-200 Evaporative System Tester smoke machine or the J-41416 ultrasonic leak tester, or possibly using soapy water and low pressure air into the tailpipe may be useful to find the leak. NOTE: All of these tests are much more effective if the throttle body is covered/sealed. For an intake leak the smoke can be introduce into the brake booster hose or the oil dipstick tube. Soapy water can be sprayed near the gasket and seams and all vacuum nipples. For an exhaust leak the hose into the tailpipe, with smoke or air, sealed with shop towels proves to be effective. Then soapy water would be sprayed around seal, seems and bosses. Ultrasonic leak detector may also find leaks in this way. These methods are very good for finding small leaks around the O2 sensor embossments and slight cracks in an intake plenum or gasket. This process was also recommended in the 10207.07D - July 2007 Emerging Issues training seminar. Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. © 2019 General Motors. All Rights Reserved.