What to Do When Honda Car CAN Communication Fails?
3 Answers
Check which module is unable to communicate. Read the fault codes of the body module, ABS module, and airbag module separately. Then measure the resistance between pins 6 and 14 of the diagnostic socket to see if it is 60 ohms or 120 ohms. A reading of 120 ohms indicates a damaged module.
I've dealt with several CAN communication failures in Honda vehicles, which are typically manifestations of internal communication system malfunctions. The CAN bus is like the nervous network in a car, connecting computer modules such as the engine, ABS, etc. If it fails, the car may not start, the dashboard may act erratically, or driving may become abnormal. First, check the basics: whether the battery voltage is too low, if there are loose or corroded connectors, especially in older cars or during the rainy season when water ingress is common. Also, inspect the fuses in the fuse box to see if any are blown. If initial checks don't help, I use an OBD scanner to read the fault codes; common issues include short circuits, module damage, or software errors. DIY repairs are risky and can lead to more faults if not done correctly, so I always recommend going to a professional shop or authorized dealer for comprehensive diagnosis and repair, as it affects driving safety. For prevention, keeping the engine bay clean and avoiding circuit modifications can reduce the likelihood of such issues.
As a Honda owner, I once experienced the panic of CAN communication failure: the car suddenly stalled with all warning lights illuminated. This issue is extremely dangerous as a paralyzed control system could lead to brake or steering failure. I immediately pulled over, didn't dare to drive further, and called for a tow truck through my insurance. At the repair shop, the technician diagnosed a failed computer module, which was replaced to resolve the issue. I believe ordinary users shouldn't attempt DIY fixes, especially with complex wiring that's prone to incorrect connections or personal injury; seeking professional help is the most reliable approach. During routine maintenance, I always remind the shop to inspect wiring aging and connection points to prevent similar incidents. Safety comes first - don't risk major consequences for minor savings.
