Diagnosing Customer Concerns w/out Hard Fault Codes

If a Diagnostic Trouble Code (DTC) is reported by the customer but is not present when the vehicle comes in for service, follow the DTC retrieval procedure in Retrieve/Clear Continuous DTCs to identify the intermittent DTC.

Once the DTC is known, read the "Normal Operation" section for the code involved.
- Study the circuit diagram and determine the location of components involved in creating that code.
- Do a thorough visual inspection of components, connectors, splices and wiring harnesses. Look for pinched wires, worn insulation on conductors, opens, shorts, or loosely mounted sensors.

The section "Possible Causes" lists common concerns that relate to that particular code. Each concern is listed in the order in which it is most likely to occur.