No power in reverse at morning startup

**DiscoJeffster** · 11th October 2022, 02:50 PM

Originally Posted by Briar

Saw indie today. Seeing him early next week. Thanks for all suggestions, hopefully will get a few more. He is going to check for codes. He doesn't reckon it would be steering angle or brake switch as it would happen in Drive as well, not just reverse. Shouldn't be EGR, the ECU was flashed 18 months ago and they were shut off. Will try the DSC, interesting idea. Car didn't do it this morning so will keep on searching. Thanks all so far.

You can’t shut off the EGR in your vehicle. You apply new map that tells them to stay closed while you’re driving. They will still run their self test action which is a full open and close at startup and shutdown, so while it’s very unlikely to be your issue, your remap doesn’t preclude them being a problem.

Anyhow, leave until last as you should get an error for them.

**Farnarkler** · 13th October 2022, 08:43 AM

Dealer can't find any problem. I have been reporting it for years, ever since I had the car. In my case, the problem happens only every now and again. Regardless of engine speed, traction slowly comes back and all is normal. No clucking, just smooth return of connection after a few seconds. Feels like low oil levels but, like you, they are normal. My latest suspicion is slow electronics. My Nav system sometimes takes up to a minute to boot up correctly. Dunno. I'll report back if I can diagnose it. Cheers.

**Graeme** · 13th October 2022, 09:48 AM

Originally Posted by Briar

Spoke to indie’s apprentice today 3 or 4th year who did service two weeks back. He said he checked auto transmission oil as part of service. Fluid level full and nothing abnormal about oil. He was a a bit of a loss as to what might be cause.

Presumably the oil temperature was in the correct range and the gear selector correct for checking the oil level. There have been instances of similar behaviour when reversing cold up slight inclines caused by the oil level being a little low.

**Briar** · 13th October 2022, 05:19 PM

Originally Posted by Graeme

Presumably the oil temperature was in the correct range and the gear selector correct for checking the oil level. There have been instances of similar behaviour when reversing cold up slight inclines caused by the oil level being a little low.

Don't know the answer to that Graeme, Do you know what the settings are meant to be. I'll follow up this aspect with Indie on Tuesday morning when he's having a squiz.

**Graeme** · 13th October 2022, 05:30 PM

ZF's level checking procedure.
ZF_Transmission_Fluid_Level_Checking_6HP26X_land_rover_fluid_level.pdf

Edit: Sorry, I assumed 6-speed.

**Cambo_oldjaguar** · 13th October 2022, 05:33 PM

As you have an early 8-speed, it might be worth checking if there is a software update available for the TCM.

I know a guy with an early L405 Vogue, he couldn't reverse up driveways, no power at all, took it to a dealer & they "updated" something, after that it was fine.

I don't have any further details unfortunately, but that's what he told me.

**Briar** · 13th October 2022, 06:32 PM

Originally Posted by Cambo_oldjaguar

As you have an early 8-speed, it might be worth checking if there is a software update available for the TCM.

I know a guy with an early L405 Vogue, he couldn't reverse up driveways, no power at all, took it to a dealer & they "updated" something, after that it was fine.

I don't have any further details unfortunately, but that's what he told me.

Will follow up on that aspect as well. The more suggestions the better. Yes Graeme, 8 speed.

PerthDisco
Didn't do the sluggish reverse yesterday morning but did do it this morning. So I tried your suggestion, I turned off DSC. It didn't make any difference. Stayed sluggish. It's not that the engine revs higher but I don't go anywhere. The engine just refuses to rev up, just like the ECU is limiting power. After about a minute, all returns to normal and it's been fine all day having to do multiple trips to tip towing trailer.

**Graeme** · 13th October 2022, 06:39 PM

Try pushing the brake pedal a few times before trying to move in case the brake light switch is initially sticking, or holding light brake pedal pressure to check if always sluggish.

**DiscoJeffster** · 13th October 2022, 06:41 PM

Originally Posted by Graeme

Try pushing the brake pedal a few times before trying to move in case the brake light switch is initially sticking, or holding light brake pedal pressure to check if always sluggish.

Yeah if it’s not the gearbox program, it does feel like the brake light switch issue

**maxperformance** · 15th October 2022, 12:17 PM

I haven't had your issue, however this symptom is quite similar to one of the issue we have had with our customers cars (especially European cars) so might be my story can give you some ideas.

You know that we fit our headunit infotainment and High-End Full HD Digital reverse camera to our customers' cars. And with many European cars (some with Asian or American cars too) there is one similar issue:

1- Symptom:
Turn on the car and reverse immediately. Then:
- The camera might not show up intermittently.
- or the car will not show up Dynamic Steering Wheel Guideline on the screen
- or the car has flashing screen with less colour or less details than normal on the reverse camera screen

2- Explanation and Solution:
- in the old cars, this would be the problem of low Voltage to the reverse power (only about 10.5V+ at that moment). This is purely because of their car setup and power going through the reverse lights. Nothing was related to the computers because that was not with computers. It was mainly because of alternator, or just the way the car was designed for, not much we could do. Just wait a few seconds then power went through up to more than 12.5V+ then it would be fine, or install a separate wiring with relay directly from the front battery to the back and it would help.

- in the European cars (from ~2003 - present) , this is purely because of the Computers setup in the car, related to CANBUS and other parts. The delay or lost signal or interference signal was because of not enough time to communicate between modules in the car and the new setup and so on (wrong signal communication). In this case solution was trying to work around the CANBUS and Computers setup, rewire and adding different modules to stabilize the power and signal. Using deep scan with high level scanner to assist the process.

In your case, even though it is not directly about Computer signal and reverse camera power signal but your car reverse power is controlled by all CANBUS computers for reverse (not mechanically control as the old rig, so oil or fluids would not be the reason from your description as you can reverse the car normal soon after a while of drive), so my recommendation is you better have a real professional scanner and a LR specialist to have a deep scan first to diagnose the root causes, before you should apply any solutions.

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My Discovery 5 does exactly this as well.

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