If you drive a Range Rover Evoque in Orlando and suddenly see a scary “Transmission Fault” warning on your dash, don’t rush to assume the worst. While it looks serious, there’s a surprisingly common and simple cause: a failing auxiliary battery.
Transmission Lockout Could Be Caused by the Auxiliary Battery
In many Evoque models, when the car detects issues with the auxiliary battery, it can actually disable or “lock out” the transmission as a safety measure. This isn’t a bug—it’s built-in protection. A weak or dying auxiliary battery can lead to unstable voltage, which affects the Transmission Control Module (TCM) and other sensitive electronic components.
We’ve seen several cases here in Orlando where drivers were ready to drop thousands on a transmission repair—only to find out all they needed was a new $50 battery. The worst part? Some shops might misdiagnose the issue and recommend a full transmission rebuild when it’s absolutely unnecessary.
Why the Evoque’s Auxiliary Battery Matters
Most Land Rover models, including the Evoque, use a small 12V auxiliary battery (typically around 1.2Ah) located near the air filter. Even though it’s small, it plays a big role in keeping your vehicle’s electrical systems stable.
This battery provides steady voltage to critical modules like the TCM. If it’s weak, the car might think the transmission is failing—even when it’s perfectly fine.
Avoid Expensive Repairs with a Proper Diagnosis
If you get a transmission fault warning in your Evoque, always start by testing the auxiliary battery before letting anyone tear into the transmission. A basic voltage check or battery load test can save you from a costly misdiagnosis.
Here in Central Florida, especially with our heat, car batteries tend to degrade faster—so it’s a good idea to have both your main and auxiliary batteries checked regularly.
Quick Guide: Transmission Fault in the Evoque
| Item | Details | What to Do |
|---|---|---|
| Common Symptom | “Transmission Fault” warning on the dash | Check the auxiliary battery first |
| Gearbox Behavior | Transmission won’t engage or shifts are blocked | Safety feature activated to protect the TCM |
| Location of Auxiliary Battery | Near the air filter; 12V / 1.2Ah battery | Inspect for voltage and physical condition |
| Most Common Cause | Failing or discharged auxiliary battery | Replace with a quality equivalent |
| Affected Module | Transmission Control Module (TCM) | Diagnostic scan can confirm fault codes |
| Battery Cost | Relatively inexpensive (typically under $100) | Worth replacing every 2-3 years |
| Misdiagnosis Risk | Shop may suggest unnecessary transmission work | Always check the battery first |
| Preventative Tip | Replace auxiliary battery every 2–3 years | Ask for battery check during regular service |
| Signs of Electrical Issues | Dashboard lights flicker, random warning messages, slow starts | Test both main and auxiliary batteries |
| Risk of Real Damage | Low if addressed quickly | Avoid driving until issue is resolved |
Real Evoque Owners Talk: Transmission Faults and the Hidden Battery Fix
Still not sure if a small battery can cause a big headache? You’re not alone. Here’s what actual Evoque owners have experienced—and how they solved it:
🧍 Zarman (2012 Evoque, 64,000 miles):
“Twice now I’ve started my Evoque and got the message: ‘Transmission Fault. Place in Park before starting.’ But I’ve never tried to start it out of Park. I just turn it off and on again, and the message goes away. Anyone know what’s going on?”
🧍 Aulus:
“Sounds like a typical electrical glitch. If it goes away after a restart, you’re probably fine. It’s likely tied to a battery issue.”
🧍 Maxed_out:
“This happened to me after leaving the car unused for a few weeks. Took it for a long drive, and the message didn’t come back. I’m pretty sure it was just a low battery charge.”
🧍 Destiny:
“It’s the second (auxiliary) battery! Mine was low voltage, kept getting the same warning. Swapped the battery and haven’t seen the message since.”
🧍 Gabrielmtl:
“Replacing the main battery worked for me, too. Don’t ignore your battery health!”
🧍 Awol1301:
“Same issue here. Changed the battery and it’s been smooth ever since. Just make sure to get a strong one—it’s worth it.”
🧍 Daniel (2024 update):
“Yes, the 2012 Evoque has a second battery. It’s located under the passenger footwell area. Not obvious, but it’s there!”
FAQ: Transmission Fault Warning on Your Range Rover Evoque
1. What does “Transmission Fault” mean on the Evoque?
This usually indicates an electrical issue affecting the TCM—not always a mechanical problem. Often, it’s the auxiliary battery causing false alerts.
2. Could it really be something as simple as a battery?
Yes. In many cases right here in Orlando, we’ve fixed this issue just by replacing the auxiliary battery. No transmission work needed.
3. Where is the auxiliary battery located?
It’s a small unit near the air filter, separate from your main car battery. Look for a 12V, 1.2Ah battery.
4. How can such a small battery cause such a big problem?
It feeds stable voltage to the TCM. Without it, the system may think the transmission is failing, even when it’s not.
5. How do I confirm if it’s really the battery?
Get a diagnostic scan of the transmission module. Also test the auxiliary battery’s voltage and capacity—it should be around 12.5–13V when fully charged.
6. Is it safe to keep driving with the warning on?
Not really. The car may limit transmission function to protect itself. It’s best to get it checked right away.
7. Do I need to open the transmission if the warning appears?
No—at least not before testing the battery. Some shops might suggest this prematurely, which can lead to unnecessary expenses.
8. What’s the cost of a new auxiliary battery?
Usually between $40–$100 depending on the brand. Much cheaper than transmission work!
9. Do I need a specialist to replace it?
Not necessarily. Any trusted mechanic familiar with European vehicles can replace it. Just make sure the new battery matches the original specs.
10. How can I avoid this issue in the future?
Get your batteries tested every couple of years, especially in Florida’s climate. Don’t wait for warning signs to show up.
If you’re in Orlando and your Evoque throws a transmission warning, don’t rush to the worst-case scenario. Let us—or your trusted local shop—check that auxiliary battery first. It might be the easiest fix you’ll ever need.
