'12 Mk3 intermittent no start

[parsj022]

Hi all,

A Focus Mk3 2012 1.6 Petrol was brought in with a no crank no start. I scanned the car for codes and found a few Lost Comms codes and 2-3 P codes. Upon clearing fault memory the car fired right up and lasted a few days then the same thing happened. I cleared the code and started fine.

 

One code that is persistent U0131:00-2F - Lost Comms with Power Steering Control Module 'A 

Hooked up FORScan and PSCM is not listed as a module (no comms) and BCM stores this.

===BCMii DTC U0131:00-2F===
Code: U0131 - Lost Communication With Power Steering Control Module 'A'

Status (-2F):
 - DTC Present at Time of Request
 - Malfunction Indicator Lamp is Off for this DTC

Module: Body Control Module

 Freeze Frame  #1:
-EVENT_TIME: 356742186 s (Tue Oct 10 12:52:40 2023) - Event time
-TOTAL_DISTANCE: 61415 km - Total Distance
-MODULE_VOLTAGE: 11.8 V - Control Module Voltage
-INCAR_TEMPERATURE: 126 °C - In car temperature
===END BCMii DTC U0131:00-2F===

I am trying to be carful not to look down the wrong path and waste alot of time, so my guesses are.

1. PSCM Module fault ( could be interfering with CAN )

2. CAN Issue somewhere else (Maybe engine bay fuse box connector - connects CAN to ECU then TCM)

3. Issue with Alternator / Grillie Actuator ( Thats on ICAN though ?? )

4. Bad Grounds?

 

Thought, Suggestions ?

 

 

 

 

[DaveT70]

Early MK3s had issues with water ingress into the BCM from the washer jets/hoses.

Check for water damage