K+DCAN cables utilize an FTDI chip to convert USB signals to serial. Outdated or generic Microsoft-supplied drivers frequently drop packets.
A weak or drained battery can disrupt communication between INPA and your vehicle’s control units. Users have reported that after jump-starting a car with a depleted battery, diagnostic errors disappeared once the battery was sufficiently charged. The diagnostic bus requires stable voltage to function properly.
Windows assigns COM port numbers based on the physical USB slot. If you plug your cable into a different USB port next time, Windows may assign it a new COM number or reset the latency timer back to 16ms.
The typically indicates a communication failure between your diagnostic software and the vehicle's hardware , often labeled as IFH-0009: NO RESPONSE FROM CONTROL UNIT . This error commonly occurs during the initialization phase or when attempting to read a specific module. Common Causes and Fixes inpa error 159
Below is an overview of the causes and solutions for this error:
For INPA to communicate reliably, the USB-to-Serial latency must be set to 1ms. Open on your PC.
This fixes the “No response” variant of Error 159. K+DCAN cables utilize an FTDI chip to convert
Move the switch to join Pins 7 and 8 . Older ECUs split diagnostic data across both pins.
Press the Start/Stop button pressing the brake/clutch pedal. Confirm that your instrument cluster lights turn on.
Follow these steps in order to systematically resolve INPA Error 159. Users have reported that after jump-starting a car
: The most frequent culprit. Your COM port latency must be set to 1ms .
If the Ignition dot does not turn black when the key is turned, it is a tell-tale sign that the car and cable are not communicating.
BMW’s K-Line is a shared data wire. Many modules (DME, EGS, ABS, Airbag, IKE) all talk on the same green wire (Pin 7 on the OBD2 port). If one module is faulty, crashed, or stuck in a "high" state, it holds the K-Line high (12v), preventing any other module from communicating. INPA tries to wake up the DME, but the dead module is screaming over it. Result: Error 159.
Ensure your dashboard lights are fully illuminated. Don't just insert the key; press the Start button twice without pressing the brake pedal.
The USB-to-serial driver (K+DCAN cable) is not set to COM1.