Encountering a P1682 error code on your OBDII scanner can be perplexing. This generic code, often described as “Ignition Switch Circuit 2,” can point towards a range of issues within your vehicle’s electrical system. While it might sound intimidating, understanding the context and employing a systematic diagnostic approach can often lead to a DIY solution, saving you time and money. This article delves into a real-world troubleshooting experience with a P1682 error, offering insights that can help you tackle similar challenges.
The journey began on a particularly cold morning. The vehicle cranked but refused to start – a frustrating “crank-no start” scenario familiar to many car owners. An initial scan pulled up the dreaded P1682 code, immediately suggesting a problem within the ignition system. The first instinct might be to suspect a faulty ignition switch itself. In this case, a new ignition switch was indeed installed, based on initial assumptions. However, the problem persisted, highlighting a crucial lesson: don’t jump to conclusions, even with an error code in hand.
The intermittent nature of the problem offered a vital clue. Warmth seemed to be a temporary fix. After bringing the vehicle into a heated garage, it started without issue. This pointed towards a temperature-sensitive component. Suspecting the Powertrain Control Module (PCM) due to its role in engine management and ignition, it was subjected to heat – but to no avail. The Body Control Module (BCM) was also considered, but the troubleshooting path shifted towards relays and fuses, components known to be susceptible to temperature changes and connection issues.
Applying heat to the fuse box proved to be the breakthrough. The engine sprang to life! However, the issue remained elusive. Simply replacing relays didn’t solve the problem. The engine would stall intermittently, especially when the fuse box cover was replaced or when the box was wiggled. This suggested a localized connection problem, not a faulty relay itself.
The focus then narrowed down to individual fuses within the box. Wiggling fuses one by one led to the discovery – the 15 amp fuse for the Throttle Control Module (TCM). A slight wiggle on this fuse caused the engine to die immediately. Upon closer inspection, the fuse itself was fine, but the terminal in the fuse box showed signs of looseness.
The root cause was finally revealed: a previously installed fuse tap on this very fuse. While removed in warmer weather, the slightly widened terminal, coupled with cold temperatures, created a weak connection. The metal contacts would contract in the cold, losing reliable contact and triggering the P1682 error and the crank-no start condition.
The solution was surprisingly simple: applying a bit of solder to the fuse leg to ensure a tighter fit within the terminal. This restored a solid connection. Since then, the vehicle has started reliably, and the check engine light, along with the P1682 code, has disappeared.
This experience underscores several important points when dealing with OBDII error codes like P1682:
- P1682 is a starting point, not the definitive answer. It indicates a problem within the ignition switch circuit, but the actual fault can be anywhere in that circuit, including fuses, relays, wiring, or even related modules.
- Temperature sensitivity is a valuable diagnostic clue. Intermittent issues related to temperature often point to connection problems or components nearing the end of their life.
- Don’t overlook the basics. Before replacing expensive components, always check fuses, relays, and wiring connections. A simple loose connection can mimic a complex electrical fault.
- DIY diagnostics can be effective. With patience and a systematic approach, you can often diagnose and fix issues like P1682 yourself.
While this particular case involved a self-inflicted issue with a fuse tap, the diagnostic process remains relevant for any P1682 error. Start with the basics, consider environmental factors like temperature, and systematically eliminate potential causes. Understanding Eobd/obdii Error P1682 is the first step towards effective troubleshooting and getting your vehicle back on the road.
