300 GPS Signal Dead: Faulty Antenna Guide

I had a very similar issue with my 2012 Chrysler 300. The GPS signal would constantly drop, making the navigation system basically useless. After checking multiple potential causes, it turned out the GPS antenna was indeed defective, causing severe signal interference. The workshop diagnosed it using specialized testing equipment to verify the satellite connection problems. The repair involved replacing the entire GPS antenna assembly mounted on the roof. Total cost was 200€ including parts and labor. Since the fix, the navigation system has worked flawlessly with perfect satellite connection. To better assist with your specific case, could you share: Does the GPS work intermittently or is it completely non-functional? Have you noticed any physical damage to the antenna housing on the roof? Are there any other electrical issues with the car? Does the error message appear immediately when starting the navigation system? Both the 300s share the same components in that generation, so the antenna repair process should be quite similar. Just want to confirm the symptoms match before suggesting specific solutions.

Thanks for sharing your experience. My GPS has been completely non-functional for the past 2 weeks. The vehicle GPS error appears immediately at startup. I had my last service at 81000 KM and no other electrical issues were found. Looking at the antenna housing, I noticed some minor cracks which could be letting moisture in and affecting the satellite connection. Would be helpful to know the exact brand of car electronics your shop used for the replacement antenna. The repair cost seems reasonable, but I want to ensure compatible parts are used for my 300 to avoid future GPS antenna issues.

Thanks for those additional details. The cracks you mentioned in the antenna housing match exactly what my mechanic found on my 300. Water intrusion through these cracks often causes GPS signal interference and complete failure of the navigation system. For the replacement, my shop used a Mopar OEM antenna assembly (part number CR233-58B). This was crucial since aftermarket GPS antennas sometimes create compatibility issues with the factory navigation module. The OEM part has better weather sealing to prevent future moisture damage. Some tips from my repair experience: Make sure the shop tests the GPS signal strength after installation, have them check the cable routing for any pinched or damaged sections, request they apply additional sealant around the antenna base, consider having the navigation system software updated while its in the shop. If the symptoms are identical to what I experienced (immediate error on startup, complete signal loss), replacing the antenna assembly should resolve the issue. The 200€ I spent included a 12-month warranty on parts and labor. Before you proceed with the repair, you might want to have them verify the GPS module itself is functioning correctly, though antenna failure is far more common than module issues in this model.

After checking the antenna housing more closely today, I can definitely confirm hairline cracks along the base. The complete GPS signal loss and immediate error code at startup match what was described with your 300. I called around and found a shop that stocks the Mopar OEM antenna assembly mentioned (CR233-58B). They quoted 185€ for the complete repair including testing the satellite connection strength afterward. They also recommended checking the navigation system for any available software updates while the car is in. Will schedule the GPS antenna replacement for next week and have them check the cable routing and apply extra sealant as suggested. The symptoms match perfectly with what was described, so feeling confident this will fix my vehicle GPS issues. Will update once the repair is complete to confirm if this resolves the car navigation problems completely. Thanks again for helping narrow down the likely cause and providing the specific part details.