Code reading

It is hard to say, there are unanswered variables. You are getting codes from the vehicles OBD feature, using info up, and on/off?

yes, that's correct. as we speak, the mechanic is charging approx. $350 to do the job. does that sound right (it's an SLS). Maybe, a small history, i read the code on friday morning before work NO chk engine light. that night i was coming home from friends house, i punched it to past a car, chk engine light came on. I drove with it on to see if it go off on it's own. it didn't. Monday morning i cleared the codes (only PCM P0327 current was detected by OBD). This morning driving to work (approx. 12mi), the code came back but NO ck engine light.

The P0327 will not illuminate the check engine light, it will store it in failure records. That was the only code in the system? It is quite possible that you have other codes, type A, or B, that are turning the light on. These may set and clear intermittently, but will remain in failure records/freeze frame history data.

I've done some reading in the past mth on this site and other's about this code, you're the first person to talk about type A or B codes. What's the difference between the two? This morning, P0327 current was the only code. How do i clear memory? disconnect the battery for an 1/2 hr?

If you are using the on-board functions, after it displays codes, it will give you the option to clear codes. Either by respective module, or all modules at once.

Diagnostic Trouble Code (DTC) Type Definitions


This information refers to domestic and export calibration packages. Use the DTCs that only apply to your specific RPO (regular production option). Each DTC is directly related to a diagnostic test. The DTC sets based upon the DTCs individual running and setting criteria.

The following are the types of DTCs and their code characteristics:

Type A




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Emissions related





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Requests illumination of the MIL on the first trip with a fail





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Stores a history DTC on the first trip with a fail





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Stores a Freeze Frame on the first trip with a fail





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Stores a Failure Record





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Updates the Failure Record the first time the test fails each ignition cycle


Type B




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Emissions related





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The code is enabled after the first trip with a fail





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The code is disabled if the second consecutive trip passes





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Requests illumination of the MIL on the second consecutive trip with a fail





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Stores a history DTC on the second consecutive trip with a fail





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Stores a Freeze Frame on the second consecutive trip with a fail





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Stores a Failure Record when the first test fails





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Updates the Failure Record the first time the test fails each ignition cycle


Type C1




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Non-emissions related





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Requests illumination of the service lamp (not the MIL), or the service message on the first trip with a fail





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Stores a history DTC on the first trip with a fail





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Does not store a Freeze Frame





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Stores a Failure Record when the test fails





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Updates the Failure Record the first time the test fails each ignition cycle


Type C0




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Non-emissions related





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Does not request illumination of any lamps





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Stores a history DTC on the first trip with a fail





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Does not store a Freeze Frame





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Stores a Failure Record when the test fails





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Updates the Failure Record the first time the test fails each ignition cycle


Type X




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Diagnostics that are coded in the software, but will not run for non-OBD?II export vehicles





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Some domestic vehicles use DTCs





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Even though codes are not stored, the DTC type table can still be used as a resource when diagnosing problems with systems that are associated with the type X DTCs


If a system is malfunctioning and the associated DTC has been disabled (type X), it may be beneficial to use the diagnostic table as a guide to aid in diagnosis. Many of the DTC tables include a functional check of the system that may pinpoint a problem. However, it is important to remember that the DTC tables are specifically designed for use only when a DTC is set. Therefore, a thorough understanding of the normal operation of the system being diagnosed is necessary and use of the tables for this purpose is at the discretion of the technician.