The P0617 code in your 2020 BMW X3 indicates that the DME (Digital Motor Electronics) has detected higher than expected voltage in the starter motor relay control circuit. This is the opposite of P0616—instead of low voltage, the circuit is showing elevated voltage levels that fall outside normal operating parameters.
Understanding High Circuit Voltage
High voltage in the starter relay circuit typically indicates the circuit isn't completing properly to ground. When current can't flow through the normal path, voltage readings appear higher than they should be. This could indicate an open circuit, failed relay coil, or disconnection somewhere in the pathway.
Common Causes in BMW X3
An open circuit in the starter relay control wiring is the primary cause. The relay coil may have failed open, preventing current flow. Disconnected or loose connectors in the starter circuit pathway cause this reading. In some cases, the DME's internal driver circuit has failed open, preventing proper current sink.
Symptoms You May Experience
The X3 may crank slowly or not at all if the relay circuit isn't completing properly. You might hear a single click but no sustained cranking. The check engine light illuminates with P0617 stored. If the relay occasionally makes contact, starting may be intermittent—working sometimes but not others.
BMW-Specific Diagnostic Approach
Using ISTA or compatible BMW diagnostic software, check for additional codes that might indicate related issues. Test the starter relay's coil for open circuit. Verify continuity through the entire control circuit from DME to relay to ground. BMW's starter circuits sometimes incorporate additional control modules that may be affected. Inspect connectors for corrosion, especially if the vehicle has been exposed to water or road salt.