U0162 is a network communication diagnostic trouble code indicating the powertrain control module (PCM) has lost communication with the Navigation Display Module (also called the radio head unit or infotainment control module). This is a Class B U-code, meaning it indicates a malfunction in the CAN bus communication between modules rather than a direct engine or transmission problem.
The navigation/radio module itself has internal failure and is not transmitting on the CAN bus, causing the PCM to detect a loss of communication.
A blown fuse (often for the radio/infotainment circuit), failed relay, or interrupted power wiring prevents the module from initializing and communicating.
CAN bus wiring between the PCM and navigation module is shorted, open, or damaged - this is common in vehicles with water intrusion or wiring harness damage.
Corroded, loose, or damaged pins at the navigation module connector can disrupt communication signals.
Another module on the same CAN bus network is faulty or causing communication interference, affecting multiple modules.
The PCM itself has a communication circuit failure - this is the least likely cause and should only be considered after all other possibilities are ruled out.
No. The PCM is almost never the cause of U-codes like U0162. In the vast majority of cases, the fault lies with the failed navigation module itself, its power supply, or the wiring between modules. Replacing the PCM for this code is almost always incorrect and wasted money.
Yes, in most cases the vehicle will drive normally. U0162 indicates a communication fault with an infotainment/navigation module, which is a comfort feature. The engine, transmission, and critical safety systems will function, though some integrated features like backup cameras may be unavailable.
Disconnecting the battery may clear the code temporarily, but if the underlying hardware failure (failed module, blown fuse, wiring issue) is not repaired, the code will return, often within minutes or days of driving.
Costs vary significantly depending on the actual cause. A blown fuse or minor wiring repair may cost little. A failed navigation display module can be expensive, as OEM units often cost hundreds to over a thousand dollars, depending on the vehicle make and model.