So I'm at church idling waiting for my wife. Just idling for a long while. Maybe 30 minutes.

I started fiddling with the controls and pressed the traction control button next to the shifter. The light came on the dash as it should but wouldn't turn off. Then I found I couldn't move the shifter out of Park.

So I shut the car off to start from the beginning and then it wouldn't restart at all. Nothing other than the dash lighting up, but no cranking. Then I started getting error messages like DSC and CATS errors. I tried waiting, retrying and and waiting. Reset the codes and still will not crank.

I found that I could move the shifter out of park after pressing the start button and brake.

Ended up having it towed home.

Battery is great, 18 months old. I only drive the car once every week or two. It could sit for a month and start right up. It's been running fine.

Don't know where to start with figuring this out.

 

What codes are being thrown?

 

Thanks:

On the dash:
"CATS System Fault"
"DSC Not Available"
"Park Brake Fault"

OBD Code reader: These codes don't go away after clearing them:
P0504 - Powertrain
U0415 - Network

I already had and park brake error for a long while now. The actuator wont engage the parking brake and it needs to be replaced/repaired. So its not relevant. The other faults are new.

Tim

 

Your battery is low. All those notifications are what a low battery displays. Idling did not charge the battery enough to keep it up to snuff. The battery may be past the point of reliability, even if given a full charge.

 

I've had this happen, unhook the battery for 5 minutes and restart, this fixed it.

 

brake switch is busted. instant dsc epb and cruise off, shifter won’t unlock starter obviously won’t engage. if you go into the cjb you’ll see it

 

And might as well change the battery at this time.

 

Thanks for the advise all.

I took the battery out and went to O'Reilly's and they ran a load test on it and said the battery is fine and not to get a new one.

The car wont take to a jump start either.

 

Check xalty’s reply. CJB =central junction box

 

With the battery out, its a good time to do a reset. Touch the + and - leads. A hard reset.

 

@Fred1996 ,

Im not certain of the value of a jump start, if the battery is good.

also, your code reader is not reading the full code. I wonder what codes are not being displayed.

i would expect, worst case scenario, that the car would start though run “unrhythmic” should unresolved electric or mechanical work was done.

As you described the series of events leading to the engine shutoff, and
If you are certain your battery registers 12.6 v; there are a few checks the car does before allowing a start sequence to commence.
However as there is an abrupt end in running, this does raise the question of a component failure.
Do you have the workshop manual??
And you REALLY need the full set of thrown codes. (Unfortunately, due to the reset, those running codes may now be deleted).

 

As Xalty posted. Are your brake lights working?
.
.
.

 

Yes. with both the old and now new brake switch.

 

I replaced the brake switch with a new one and still the same no crank issue. The 5A fuse in the CJB is good also.

I used another code reader by INNOVA:

these codes come up twice ea. and they come back immediately after clearing the codes each time. (I've have a parking brake actuator issue for a long time, so that is another thing altogether.)

- U0415 Invalid Data received from ABS Control Module
- P0504 Brake Switch A/B Correlation

 

Have you tried stomping hard on the brake pedal?

From the manual - I have no clue what "the brake light switch value" means or is.

P050400
Brake switch A/B correlation·

The brake pressure reading does not agree with the brake light switch value

Carry out the pinpoint tests associated with this DTC using the manufacturer approved diagnostic system.

Before the engine crank request is allowed, the CJB compares a brake pressure signal received from
the ABS module. The brake pressure signal is compared to an internally stored threshold value within
the CJB. If the signal is greater than the stored threshold value, a crank request signal is sent to the
ECM on the high speed CAN bus.

CAUTION: During installation of the brake switch, make sure the brake pedal is
not depressed at any time. Depressing the pedal may cause: poor operation of the brake
light switch and brake lights, diagnostic trouble codes to be logged and/or failure of the
vehicle to start.

 

@Fred1996, did you perform a hard reset as suggested by @sony2000? if you are trying to reset an affected module, simply disconnecting the battery may not be fully discharging it’s capacitor. The following is from Jaguar's “Technical Training 688-JAG: Advanced Electrical Systems and Diagnostics”, page 3-15, covering Control Module Programming:

 

Yes. I have done a hard reset multiple times. touched the terminals together for 30 min while disconnected from the battery.

Checked fuses, and grounds. cleaned and resecured the RH wheel well grounds and under body ground under the passenger area.

 

Yes. Very hard. Many times. I'll try reinstalling the switch.

 

From the electrical drawings it looks like the brake switch is normally open - you could just short the two leads together and then pump the brake to see if it will start.

 

Unfortunately not that simple. Its a 4 pin brake pedal position sensor. Its got some kind of potentiometer in it. It compares the brake pedal position with the ABS system brake pressure to allow a crank signal to proceed.

From McJagg 222:

P050400
Brake switch A/B correlation·

The brake pressure reading does not agree with the brake light switch value

Carry out the pinpoint tests associated with this DTC using the manufacturer approved diagnostic system.

Before the engine crank request is allowed, the CJB compares a brake pressure signal received from
the ABS module. The brake pressure signal is compared to an internally stored threshold value within
the CJB. If the signal is greater than the stored threshold value, a crank request signal is sent to the
ECM on the high speed CAN bus.