What is the reason for the occurrence of the P1614 fault code in a car?
2 Answers
When the P1614 fault code appears in a car, it is mostly due to an issue with the engine control module. First, check whether there is a problem with the engine control module. If there is, proceed with repairs. If not, take the car to a 4S shop for further diagnosis to identify the issue. An engine control module fault indicates that the engine may have malfunctioned. When the onboard computer receives parameters from the oxygen sensor and detects that the exhaust emissions significantly exceed the national legal standards, the internal program of the computer cannot correct them to the standard range. At this point, the engine control computer will trigger a warning light on the dashboard (a yellow pollution light) to alert the owner to check the engine's pollution emissions at a service station. The P1614 fault code consists of the following: 'P' stands for the powertrain, which includes the engine and transmission, representing a standard fault code. The number after '1' indicates a manufacturer-specific definition. According to standards, '7' and '8' represent the transmission, '1' and '2' represent fuel and air, '3' represents ignition, '4' represents the exhaust system, '5' represents idle control, '6' represents computer control, and '0' and '9' are reserved. The engine control module is essentially the engine's ECU (Electronic Control Unit). The ECU, also known as the 'onboard computer' or 'vehicle computer,' serves as a specialized microcomputer controller for automobiles. Generally, the ECU has self-diagnostic and protection functions. When a fault occurs in the system, it automatically records the fault code in RAM and adopts protective measures to read substitute programs from the inherent programs to keep the engine running. Meanwhile, these fault messages will be displayed on the dashboard and remain illuminated, allowing the driver to promptly identify the issue and drive the car to a repair shop.
That time when my car showed the P1614 trouble code really annoyed me. It took a long time to figure out it was the anti-theft chip in the key fob that had failed. When this tiny chip goes bad, the car can't recognize the key, won't start, and sometimes even stalls directly. A mechanic friend mentioned it could also be an ECM (Engine Control Module) issue—like moisture causing a short circuit or loose wiring connections interfering with communication. He said this is a common problem for brands like GM, especially in older models. He advised against DIY fixes as it might lock the system; instead, first get an OBD scanner to pinpoint the exact fault, saving both money and hassle. Once the anti-theft system fails, the security function may be disabled, risking theft when parked—so I always check the key fob battery and car battery voltage regularly. This habit has helped me dodge many headaches.
