Incorrect Battery Voltage

[Kurtis.UK]

Hi, got a 2017 Ford Focus. A few months ago my stop start stopped working, few days ago got my battery tested and it was showing as good and the voltage showing at 12.4v on their machine. Plugged forscan in to the car and it is showing the battery voltage is around 11.4-11.7V. Took it to another garage and they also said the battery tests fine and all seems fine with it. Does anybody have any idea why there is a difference between the battery tester's voltage and the voltage shown in Forscan and through the test menu on the instrument panel?

 

Put a charger on the battery for a bit, and according to the charger it was around 12.3 - 12.6v

 

I also had a few random DTC codes, I cleared them but they have came back:

===PCM DTC None===
Successful DTC reading, no error codes found

Module: Powertrain Control Module

===END PCM DTC None===

===OBDII DTC None===
Successful DTC reading, no error codes found

Module: On Board Diagnostic II

===END OBDII DTC None===

===APIM DTC None===
Successful DTC reading, no error codes found

Module: Accessory Protocol Interface Module

===END APIM DTC None===

===SASM DTC None===
Successful DTC reading, no error codes found

Module: Steering Angle Sensor Module

===END SASM DTC None===

===ABS DTC None===
Successful DTC reading, no error codes found

Module: Antilock braking system

===END ABS DTC None===

===RCM DTC None===
Successful DTC reading, no error codes found

Module: Restraint Control Module

===END RCM DTC None===

===PAM DTC U0155:00-28===
Code: U0155 - Lost Communication With Instrument Panel Cluster (IPC) Control Module

Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC

Module: Parking Aid Module

===END PAM DTC U0155:00-28===

===PSCM DTC None===
Successful DTC reading, no error codes found

Module: Power Steering Control Module

===END PSCM DTC None===

===BCMii DTC U0010:88-28===
Code: U0010 - Medium Speed CAN Communication Bus

Additional Fault Symptom:
- Bus Off

Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC

Module: Body Control Module

Freeze Frame :
-GLOBTIM: 119736138 s - Global real time
-TOTDIST: 34078.0 km - Total Distance
-MAINECUV: 11.75 V - Main ECU voltage supply
-PWR_MODE_QF: Power Mode OK - Power Mode Quality Factor
-PWR_MODE_KEY: Ignition On - Power Mode Key State
===END BCMii DTC U0010:88-28===

===FCIM DTC None===
Successful DTC reading, no error codes found

Module: Front Controls Interface Module

===END FCIM DTC None===

===PDM DTC None===
Successful DTC reading, no error codes found

Module: Passengers Door Control Unit

===END PDM DTC None===

===DDM DTC None===
Successful DTC reading, no error codes found

Module: Drivers Door Module

===END DDM DTC None===

===HVAC DTC U2100:00-0A===
Code: U2100 - Initial Configuration Not Complete

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

Module: Heating Ventilation Air Conditioning

===END HVAC DTC U2100:00-0A===

===HVAC DTC U0140:00-0A===
Code: U0140 - Lost Communication With Body Control Module

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

Module: Heating Ventilation Air Conditioning

===END HVAC DTC U0140:00-0A===

===RFA DTC None===
Successful DTC reading, no error codes found

Module: Remote Function Actuator

===END RFA DTC None===

===ACM DTC B1A01:15-2F===
Code: B1A01 - Speaker #1

Additional Fault Symptom:
- Circuit Short To Battery Or Open

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

Module: Audio Control Module

Freeze Frame :
-GLOBTIM: 119465655 s - Global real time
-TOTDIST: 33773.0 km - Total Distance
-MAINECUV: 11.75 V - Main ECU voltage supply
-INCARTMP: 27 °C - In car temperature
===END ACM DTC B1A01:15-2F===

===ACM DTC B1A02:15-2F===
Code: B1A02 - Speaker #2

Additional Fault Symptom:
- Circuit Short To Battery Or Open

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

Module: Audio Control Module

Freeze Frame :
-GLOBTIM: 119465655 s - Global real time
-TOTDIST: 33773.0 km - Total Distance
-MAINECUV: 11.75 V - Main ECU voltage supply
-INCARTMP: 27 °C - In car temperature
===END ACM DTC B1A02:15-2F===

===ACM DTC B1A03:15-2F===
Code: B1A03 - Speaker #3

Additional Fault Symptom:
- Circuit Short To Battery Or Open

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

Module: Audio Control Module

Freeze Frame :
-GLOBTIM: 119465655 s - Global real time
-TOTDIST: 33773.0 km - Total Distance
-MAINECUV: 11.75 V - Main ECU voltage supply
-INCARTMP: 27 °C - In car temperature
===END ACM DTC B1A03:15-2F===

===ACM DTC B1A04:15-2F===
Code: B1A04 - Speaker #4

Additional Fault Symptom:
- Circuit Short To Battery Or Open

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

Module: Audio Control Module

Freeze Frame :
-GLOBTIM: 119465655 s - Global real time
-TOTDIST: 33773.0 km - Total Distance
-MAINECUV: 11.75 V - Main ECU voltage supply
-INCARTMP: 27 °C - In car temperature
===END ACM DTC B1A04:15-2F===

===IPC DTC U0073:88-28===
Code: U0073 - Control Module Communication Bus A Off

Additional Fault Symptom:
- Bus Off

Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC

Module: Instrument Panel Control Module

===END IPC DTC U0073:88-28===

===IPC DTC U0140:00-28===
Code: U0140 - Lost Communication With Body Control Module

Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC

Module: Instrument Panel Control Module

===END IPC DTC U0140:00-28===

===IPC DTC U0121:00-28===
Code: U0121 - Lost Communication With Anti-Lock Brake System (ABS) Control Module A

Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC

Module: Instrument Panel Control Module

===END IPC DTC U0121:00-28===

===IPC DTC U0151:00-28===
Code: U0151 - Lost Communication With Restraints Control Module

Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC

Module: Instrument Panel Control Module

===END IPC DTC U0151:00-28===

===IPC DTC U0159:00-28===
Code: U0159 - Lost Communication With Parking Assist Control Module A

Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC

Module: Instrument Panel Control Module

===END IPC DTC U0159:00-28===

===IPC DTC U0131:00-28===
Code: U0131 - Lost Communication With Power Steering Control Module A

Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC

Module: Instrument Panel Control Module

===END IPC DTC U0131:00-28===

 

 

Thanks

Kurtis

[Tizer]

21 minutes ago, Kurtis.UK said:

Does anybody have any idea why there is a difference between the battery tester's voltage and the voltage shown in FORScan and through the test menu on the instrument panel?

If you are measuring it with the Ignition on then the voltage will look low because of the current that having the Ignition on draws.

If you want a true reading then measure it with a Voltmeter across the battery terminals 1/2 hour after the car has stopped.

[bartek1975]

jak sobie poradziłeś z tymi błędami i baterią? co było powodem?

[StephenFord]

26 minutes ago, bartek1975 said:

jak sobie poradziłeś z tymi błędami i baterią? co było powodem?

wypróbuj tego kolegę, możesz uzyskać odpowiedź.

Try this buddy, you may get a response...

 

[unofix]

The Nottinghamshire  regional accent is so difficult to understand 😧