L322 Multiple can bus errors - bad earth?

Please excuse the long list below.
Had a very recent gearbox recon, plus alternator failure so replaced at same time, plus abs ecu repaired as getting 3 amigos. All ok for a while but now getting ‘engine failsafe’ ‘trans failsafe’ ‘dsc, hdc, abs inactive’ ‘air suspension inactive’ rev counter dropping to zero then recovering, temp gauge max then recovering, - can clear faults then drive again for a while, wondering if/when it will ‘bong, bong, bong’ again.
Also had a new battery about 3 months ago.

This was the fault list before clearing - it really looks electrical to me but where? Anyone else had similar? This thing has cost me the best part of £3k in the last month and I’ve had my fill.

Any suggestions greatly received

Lenb

ABS-Brake Module

• 0x5B Steering angle sensor CAN error
• 0x38 CAN error
• 0x3A Gear box control unit CAN error

EAS-Suspension

• 0x32 CAN bus Fault

IP-Instrument Pack

• 0xF0 CAN bus fault - Bus off
• 0x8D Transmission Interface Bus fault
• 0xF6 CAN bus fault - No DMER1 received from EMS ECU
• 0xF5 CAN bus fault - No ASC1 received from ABS ECU
• 0xEE No ASC4 received from ABS ECU

LCM-Light Control v12+

• 0x57 Air suspension active/inactive
• 0x58 Engine emergency program fault
• 0x59 Transmission emergency program fault

PATS-AntiTheft

• 0x23 Key 2 - Random code tolerance increased

SASM-Steering Angle

• 0xC CAN bus off
• 0x9 Incorrect CAN message

TBOX-Transfer Case

• 0x52EA CAN bus OFF (0x52EA)
• 0x52E9 DME2 lost from CAN (0x52E9)
• 0x52EB DME1 lost from CAN (0x52EB)
• 0x52F2 INSTR3 lost from CAN (0x52F2)
• 0x52ED INSTR2 lost from CAN (0x52ED)
• 0x52E7 ASC1 lost from CAN (0x52E7)
• 0x52EC ASC2 lost from CAN (0x52EC)
• 0x52E8 EGS lost from CAN (0x52E8)
• 0x52F3 EGS2 lost from CAN (0x52F3)

TCM-Transmission

• 0x81 CAN bus engine management system timeout: General fault
• 0x80 CAN bus monitor fault: General fault
• 0x20 Output shaft speed sensor fault: General fault
• 0x20 Output shaft speed sensor fault: General fault

I'd be checking for water ingress, as all the systems are stupidly interconnected, the actual problem could be anywhere on the CANBUS.

Datatek said:

I'd be checking for water ingress, as all the systems are stupidly interconnected, the actual problem could be anywhere on the CANBUS.

Click to expand...

I am getting a fair amount of water under spare wheel but can’t work out where from.

lenb said:

I am getting a fair amount of water under spare wheel but can’t work out where from.

Click to expand...

So look at all the modules behind the trim in the left side of the boot. Water and or condensation may have damaged one or more of the modules and/or corroded the connectors.
Leaks are a common problem

As above, water is the chief culprit on this I would hazard a guess....

Also, if you still have the headlamp leveling ECU fitted i nthe pax footwell A pillar, this is known for dragging the CANbus down.