Table 1 shows one common vehicle speed control related problems of the 1996 GMC Envoy.
| Problem Category | Number of Problems |
|---|---|
| Vehicle Speed Control problems |
Hello, we purchased the 2006 yukon denali Envoy with low mileage between 30,000 45,000 miles. We didn't expect to run into major ( throttle body and fuel sensortank embedded) problems. There are many complaints lodged on the internet about these dtc engine trouble codes (p2135, p0463). The sudden loss of power in the middle of traffic may cause an accident. According to GMC technical service bulletins in correcting the problem, the first dealer told me they must follow a diagnostic troubleshooting flow chart to resolution. The first gm/GMC dealer stated the first stage of the diagnostic flowchart says the throttle body should be cleaned and not replaced. The reason not initially replaced is because the throttle body is a high priced item. We then took it back to the 1st dealer at which the diagnostical flowchart was again used. According to the flowchart the next course of action calls for replacement of the throttle body. Again it was short lived. If the flowchart diagrams are outdated and poorly designed, they should be updated. The technical service bulletins need to be better written so unnecessary costly steps for the consumer could be avoided. We then took it to a different dealer for the 3rd time explaining the repeat engine light code of p2135. They ran the codes again stored in memory and retrieved the same p2135 code I retrieved. The second dealer also replaced the throttle body only for the problem to resurface. After sharing with them the resolution I retrieved from the internet, ( wiring harness connected to the throttle body ), eventually the gm ase technician correct the wiring harness problem. Recommendations should be made to all dealerships including gm/GMC demanding that regional chronic trouble groups ( county specific) be established to combat these extreme automotive expenses. These vehicles having consistent high part replacements is the real gauge that substantiates and warrant a nationwide recall on these defective parts.