After many hours of troubleshooting, I'm now at a loss.  I can't start my car due to an unknown electrical issue.

 

I have replaced fuses in the dash and engine bay, checked the three relays behind the dash gauges, I have spent hours tracing wires with a multimeter and even replaced the starter motor unit.  When trying to crank the car, the starter does not turn, the battery does have charge, and I even substituted a spare battery in to rule out that issue.  Any suggestions to get this issue resolved would be great.

 

I have attached the OBD11 readout below:

 

OBDeleven data log

Date: 2022-01-09 17:13

    VIN: TMBFN6NJ6GZ101615
    Car: Skoda Fabia
    Year: 2016
    Body type: 5-dr hatchback
    Engine: CJZD
    Mileage: 186984 KM

---------------------------------------------------------------
01 Engine

    System description: R4 1.2l TFS
    Software number: 04E906027BC
    Software version: 9023
    Hardware number: 04E907309AF
    Hardware version: X22
    ODX name: EV_ECM12TFS01104E906027BC
    ODX version: 001008
    Long coding: 01190032230401080000

Trouble codes:
        P305200 - Starter activation, return message terminal 50 Short circuit to B+
            static
Date: 2021-11-25 00:22:35
Mileage: 186984 km
Priority: 2
Malfunction frequency counter: 1
Unlearning counter: 255
Engine speed: 0.00

Normed load value: 0.0 %
Vehicle speed: 0 km/h
Coolant temperature: 5 °C
Intake air temperature: 6 °C
Ambient air pressure: 980 mbar
Voltage terminal 30: 11.874 V
Dynamic environmental data: 209628126C2015A60016A2024615A70020124900000C38124A000000BE

 

U100800 - Diagnostic interface for data bus Read out DTC
            static

Date: 2021-11-25 00:22:40
Mileage: 186984 km
Priority: 2
Malfunction frequency counter

Unlearning counter: 255
Engine speed: 0.00

Normed load value: 0.0 %
Vehicle speed: 0 km/h
Coolant temperature: 5 °C
Intake air temperature: 6 °C
Ambient air pressure: 980 mbar
Voltage terminal 30: 11.732 V
Dynamic environmental data: 209628101C27051097000010BE0159124802

 

 

you have remembered to press the clutch pedal fully down when trying to start (assuming manual transmission)?

@TheFozzyto me as a NON-expert your trouble codes (not that you should ever just rely on raw error codes) suggest that a sensor is not sending information, or it's not being received, perhaps because the sensor is faulty or broken or a connection or wire or program from it to any computer or its program is faulty or broken.  Combining with john510's post, is that sensor at the clutch pedal (I don't know btw).

 

"  Trouble codes:
        P305200 - Starter activation, return message terminal 50 Short circuit to B+
            static "

 

Terminal 50 is the output from the ignition switch to operate the starter.

 

I would start at the ignition switch & check you have an electrical signal leaving the switch when turned to the start position.

 

From there I would guess it goes to a relay, then on to the started solenoid, but you will need a circuit diagram.

Edited 10 January, 20224 yr by PipH