2012 GTD - Wont Start - New Battery - Relay Clicking + Fan On

[jeep15cba]

Just got back from 3wks away and battery had died. Charged overnight and started.

1. Driving home and 120km from start and 120km to go it shut down and I rolled to a stop.
Pulled over, didn't start the first time but 3 sec later it did. Continued 500m down the road for 30mins.

2. It started and drove for another 5km and died again and I rolled to a stop.

3. It started straight away and attempt #3 got me another 5km and I decided to call RACQ. It got towed home.

Now I'm home, i've replaced the battery and it cranks but doesnt start.
I've changed the fuel filter and same as above.

2 things I've noticed:
- the fan comes on whilst the key is in accessory and the car hasn't run for 24hrs.
- disconnect and reconnect battery, no noise. Try to start it and when I stop, remove the key there is a relay click under the HV fuses in the engine bay and I can here a pump trying to turn over. I've disconnected a few different electronics but not sure what is trying to turn over.

Any help would be great.

My OBD from OBD Aus says a CAN bus issue (can be battery related) and an Engine Control Module (fault 01314) which is more concerning.

On the dash I have a battery light, engine light, seat belt light, traction control light and TPMS alert light all illuminated plus the ESP Error.

NOTE: When i reconnect the battery I do the VW steering wheel turn lock to lock to remove the steering wheel light but the ESP Error remains.

TIA

[Hillbilly]

Got the cables around the correct way???

[MIG]

Fans running full blast, and the engine won't start typically means the ECU has not booted up, no power or dead.

With your scan, do all the other modules respond? If so I would be looking at power to the ECU, fuses first, then power at the ECU connector.

If other modules don't respond, check the gateway

[jeep15cba]

Got the cables around the correct way???

Which cables?
The battery +ve and -ve? Yes

[jeep15cba]

Fans running full blast, and the engine won't start typically means the ECU has not booted up, no power or dead.

With your scan, do all the other modules respond? If so I would be looking at power to the ECU, fuses first, then power at the ECU connector.

If other modules don't respond, check the gateway

These are the errors:
OBD-II
Data Bus, engine control unit (ECM) A - no communication (U0100)
02. Transmission Control
P1850 Data Bus Drive: no messages from engine control unit (1825

03. ABS Control
Tire Pressure Alarm - pending fault (02214)
ECU - pending fault present Test conditions met

[jeep15cba]

@MIG,
The ECU seems to be getting power and all fuses are good.
This is a full export from the OBD scan which shows some modules are responding.

Any other thoughts?


Car Scanner ELM OBD2
Version: 1.102.2/1.102.2/iOS
DTC report
Connection profile: Volkswagen OBD-II / EOBD Diesel DPF var.1Date: 3/15/2024 8:14:03 AM
============================
OBD-IIOBD-II

U0100 [0xC100]
Data bus, engine control module (ECM) A - no communication
Status: Pending

P0914 [0x0914]
Gear shift position circuit - malfunction
Status: Pending

P0864 [0x0864]
Transmission control module (TCM), communication - range/performance problem
Status: Pending

U0103 [0xC103]
Data bus, gear shift module - no communication
Status: Pending
============================
19. CAN Gateway19. CAN Gateway

01312 [0x0520]
Data bus drive
Status: Test conditions are met, Validated and stored in non volatile memory

01314 [0x0522]
Engine control unit
Status: Test conditions are met, Validated and stored in non volatile memory, Validated fault present at time of request

01303 [0x0517]
Phone Transceiver-R36; Transmitter and receiver for telephone R36
Status: Test conditions are met, Test has not been completed, Validated and stored in non volatile memory
============================
09. Onboard supply control unit09. Onboard supply control unit

00988 [0x03DC]
Right Brake Light Lamp-M10; Right brake light bulb-M10
Status: Pending fault present during this driving cycle, Test is inhibited by other DTC, Validated and stored in non volatile memory

01314 [0x0522]
Engine control unit
Status: Test conditions are met, Validated and stored in non volatile memory, Validated fault present at time of request

03266 [0x0CC2]
Status: Pending fault present, Test is inhibited by other DTC, Validated and stored in non volatile memory

00987 [0x03DB]
Left Brake Light Lamp-M9; Left brake light bulb-M9
Status: Pending fault present during this driving cycle, Test is inhibited by other DTC, Validated and stored in non volatile memory

00778 [0x030A]
Steering Angle Sensor-G85; Steering angle sender G85
Status: Test conditions are met, Validated and stored in non volatile memory

01309 [0x051D]
Power steering control unit-J500
Status: Test conditions are met, Validated and stored in non volatile memory

01315 [0x0523]
Gearbox control unit; Transmission control unit
Status: Test conditions are met, Validated and stored in non volatile memory

01316 [0x0524]
Brake control unit
Status: Test conditions are met, Validated and stored in non volatile memory
============================
02. Transmission control unit02. Transmission control unit

28907 [0x70EB]
U0235 Adaptive Cruise Control: No Communication
Status: Validated and stored in non volatile memory, Validated fault present at time of request

18258 [0x4752]
P1850 Data bus drive: no messages from the engine control unit; Data bus drive missing message from engine control unit
Status: Validated and stored in non volatile memory, Validated fault present at time of request

01196 [0x04AC]
Engine and gearbox data bus; Engine / transmission data bus
Status: Test conditions are met, Validated and stored in non volatile memory, Validated fault present at time of request

18270 [0x475E] Archive (inactive)
P1862 Data bus drive: no messages from the instrument cluster; Data bus drive missing message from the instrument cluster
Status: Validated and stored in non volatile memory

18097 [0x46B1] Archive (inactive)
P1689 Data bus drive: implausible message from the central switching unit; Data bus drive implausible message from electronic central electrics
Status: Validated and stored in non volatile memory

18036 [0x4674] Archive (inactive)
P1628 Drive data bus: no messages from the steering angle sensor; Data bus drive missing message from the steering angle sender
Status: Validated and stored in non volatile memory

18275 [0x4763] Archive (inactive)
P1867 Drive data bus: no messages from the steering column control unit J527; Data bus drive missing messages from steering column electronics J527
Status: Validated and stored in non volatile memory

18261 [0x4755] Archive (inactive)
P1853 Data bus drive: implausible message from the ABS control unit; Data bus drive implausible message from ABS control unit
Status: Validated and stored in non volatile memory

00653 [0x028D]
Reliability of the data from the automatic transmission / gear selector; Plausibility selector lever / transmission
Status: Test conditions are met, Validated and stored in non volatile memory
============================
03. ABS control unit03. ABS control unit

02214 [0x08A6]
Tire Pressure Alarm; Tire pressure warning
Status: Pending fault present during this driving cycle, Validated and stored in non volatile memory

01314 [0x0522]
Engine control unit
Status: Pending fault present, Test conditions are met, Test is inhibited by other DTC, Validated and stored in non volatile memory

01299 [0x0513]
Data Bus Diagnostic Interface-J533; Diagnostic interface for data bus J533; Wrong immobilizer code
Status: Test conditions are met, Validated and stored in non volatile memory

01309 [0x051D]
Power steering control unit-J500
Status: Test conditions are met, Validated and stored in non volatile memory

01317 [0x0525]
The control unit in the instrument cluster-J285; Control Module in Instrument Cluster (J285); Control unit in dash panel insert-J285
Status: Test conditions are met, Validated and stored in non volatile memory

01321 [0x0529]
Airbag Control Unit-J234; Airbag control unit J234
Status: Test conditions are met, Validated and stored in non volatile memory

01312 [0x0520]
Data bus drive
Status: Test conditions are met, Validated and stored in non volatile memory

00778 [0x030A]
Steering Angle Sensor-G85; Steering angle sender G85
Status: Test conditions are met, Validated and stored in non volatile memory, Validated fault present at time of request
============================
01. Engine control unit
No DTC found.
============================
08. Heater and climate08. Heater and climate

13701376 [0xD11100]
Status: Test failed, Confirmed
============================
17. Dashboard17. Dashboard

12648448 [0xC10000]
Status: Test failed, Confirmed
============================
25. Immobilizer
No DTC found.
============================
44. Power steering44. Power steering

03803 [0x0EDB]
Status: Validated and stored in non volatile memory, Validated fault present at time of request, Validated fault has been present during this drive cycle

01312 [0x0520]
Data bus drive
Status: Pending fault present during this driving cycle, Test conditions are met, Test is inhibited by other DTC, Validated and stored in non volatile memory

01314 [0x0522]
Engine control unit
Status: Test conditions are met, Validated and stored in non volatile memory, Validated fault present at time of request
============================