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Cadillac Repair/Service Emissions

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Expert: autohelp - 3/16/2009


Question
On a 96 SLS with a Service Emissions System warning light, I pressed the off and warmer buttons and got the following codes.  PC0139 Current, PC0603 History, and TC0073 History, and at the end of the cycle PCM? remained on the screen.
Is this a serious problem and your suggestions please.
Thank you for this fantastic service..

Answer
PC0139 Current = Pre-converter slow to respond.

PC0603 History = Battery was disconnected in the past.

TC0073 History = PCM (computer) to Traction Control System (TCS) interface fault.

You will need numerous pictures and directions.

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On hands professional expertise in all aspects of Cadillac diagnostics and repair mid 1970`s thru 2000 year vehicles. GM certified in electronic fuel injection, Automatic transmission, Heating and A/C, and onboard vehicle computer diagnostics.

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Held over 15 GM certifications prior to retirement in 1989.

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Prior to retirement held several ASE certifications, numerous Factory certifications.

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