Jeep Cherokee Diesel Cold Start and Smoke Issues Fixed

Had similar symptoms on a 2010 Jeep Grand Cherokee diesel. The cold start issues and constant preheat light indicated problems with the heating element system. The diagnostic test revealed faulty connections at the glow plug control module. The heavy smoke during acceleration often points to worn glow plugs or control unit failure. In my case, three glow plugs needed replacement, and the control module had corroded connections. The engine light was triggered by the system detecting inconsistent voltage from the failing components. This is a common issue on these models and requires proper diagnosis. The repair involves: Testing individual glow plug resistance, Checking control module connections, Verifying proper voltage at each plug, Inspecting wiring harness condition While not catastrophic if addressed early, ignoring these symptoms can lead to starting reliability issues and potential engine damage. Consider having a complete glow plug system inspection done by a specialist who regularly works on diesel engines. The smoke issue cleared completely after the repair, and cold starts returned to normal operation with no engine misfire incidents since.

I also experienced this exact problem with my Cherokee last winter. After getting it fixed, my cold starts have been perfect with no vehicle stalling or smoke. The diesel engine runs smoothly now, even in cold weather. Can you share how much the repair cost in your case? Just wondering since prices can vary. Also, have you noticed any other issues come up since the glow plug system was repaired? The diagnostic test on mine showed a few other minor concerns that I opted to fix while it was in the shop.

Glad to hear you got similar positive results with your Cherokee. Since having the glow control unit defective fixed at the shop, my diesel engine has been running flawlessly with no starting issues whatsoever. The repair was straightforward, they found and fixed a faulty cable connection to the control unit, which cost 95 Euro for the complete job. The cold start performance has been perfect since the repair, with no engine light warnings or smoke problems. The diagnostic test they ran showed the glow plug system is now working exactly as it should. No other issues have emerged in the months following the fix, and the engine maintains strong, consistent performance regardless of temperature. Regular car maintenance helped catch this early, preventing any additional complications that could have developed if left unchecked. The repair cost was reasonable considering the improved reliability and performance of the vehicle.

I finally got my Cherokee fixed after dealing with those frustrating starting issues. Found a skilled diesel engine specialist who properly diagnosed the problem. The complete diagnostic test revealed two faulty glow plugs and a damaged control unit that needed replacement. The repair cost came to 425 Euro total, 280 Euro for parts and 145 Euro for labor. While in the shop, they also found and fixed a loose connection in the heating element wiring harness. The mechanic was thorough and showed me the worn components, explaining how they affect cold starts. After a week of driving, the difference is remarkable. No more smoke during acceleration, quick cold starts, and the preheat light works normally now. The engine runs smoother than ever. Definitely worth getting it properly diagnosed rather than continuing with the guesswork at my previous mechanic. The whole experience taught me to seek out specialists who understand diesel engines and their specific starting systems. Will be sticking with this shop for future maintenance needs.