Experiencing electrical issues with your 2004 Grand Prix Gtp can be incredibly frustrating, especially when it leads to a no-start condition. Many owners of the 2004 Pontiac Grand Prix GTP have encountered perplexing electrical gremlins, and one owner recently shared their detailed experience in a forum, seeking help to diagnose a recurring no-start problem. Let’s delve into the timeline of events and potential solutions for this perplexing issue.
The owner’s ordeal began on a road trip. Initially, the 2004 Grand Prix GTP performed flawlessly on a drive from Florida to Nashville. However, after parking and returning to the vehicle after a concert, the problems started. Upon starting the car, the radio abruptly shut off, and the driver information center displayed “Security System Maintenance” and “Traction Control Maintenance” messages. Despite these warnings, the engine was still running. Hoping for a quick reset, the owner turned off the ignition, but then the car refused to restart, only producing a click sound when attempting to crank the engine.
Towing the vehicle to a local garage seemed to offer a temporary reprieve. The next morning, the car inexplicably started without any issues. The mechanics suspected a possible ignition switch/tumbler problem, a known issue in some Grand Prix models, and suggested a visit to the Chevrolet dealership. At the dealership, technicians thoroughly inspected the battery, alternator, and starter, declaring them to be in good working order. Even the ignition switch seemed to be functioning correctly after numerous tests. However, preemptively replacing the ignition switch seemed like a sensible step given the initial suspicion.
Confident that the issue was resolved, the owner resumed their journey, driving back to Florida without incident. Unfortunately, this peace of mind was short-lived. Just a week later, while driving to Jacksonville, the same electrical symptoms reappeared. About 15 minutes from their destination, the radio cut out momentarily, and the familiar “Security System Maintenance” and “Traction Control Maintenance” messages illuminated the dash. Again, the car continued to run. Upon parking and switching off the engine, the car restarted without hesitation. However, the following morning, the dreaded no-start condition returned, accompanied by the same clicking sound and non-functional radio. Strangely, after a couple of hours, the car started normally once more.
Adding another layer of complexity, the 2004 Grand Prix GTP is equipped with an aftermarket remote start system. Attempts to use the remote start also failed, with the system engaging the starter briefly but failing to crank the engine, further suggesting a deeper electrical or starting issue. Consulting with a local Chevrolet dealer, the owner received a few potential diagnoses. The first suggestion was to disconnect the aftermarket remote start system, as it could be interfering with the car’s electrical system. If the problem persisted, a failing Body Control Module (BCM) was considered a possible culprit. Less likely, but still mentioned, was a potential issue with the Passkey system.
Diagnostic scans at the first dealership revealed a series of error codes: P0128, P0136, P0137, P0615, and P0703. These codes point to various potential issues, including coolant thermostat malfunction (P0128), O2 sensor circuit malfunctions (P0136, P0137), starter relay circuit (P0615), and torque converter/brake switch circuit (P0703). While some of these codes might be related to the intermittent electrical problems, others could be separate issues or even triggered by the main fault.
For owners facing similar no-start or electrical issues with their 2004 Grand Prix GTP, this detailed account highlights the importance of systematic troubleshooting. While the exact cause in this scenario remains undetermined without further investigation, the potential culprits range from a faulty aftermarket remote start system to a failing BCM or even deeper electrical issues. Disconnecting the remote start is a logical first step to rule out any interference. If the problem persists, further diagnostic steps focusing on the BCM, Passkey system, and a thorough review of the error codes are crucial to pinpoint the root cause and implement an effective repair. It’s important to consult with a qualified mechanic experienced with 2004 Grand Prix GTP electrical systems to avoid costly guesswork and ensure a proper resolution.
