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2017 Discovery Sport HSE Lux - Transmission Fault & Limp Mode (P0700)

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Mike T. · rep 0 · May 25, 4:41 AM · 1 replies · solved · Question

Vehicle: 2017 Land Rover Discovery Sport HSE Lux

Hey fellow Land Rover owners,

I'm having a serious issue with my 2017 Land Rover Discovery Sport HSE Lux. A few days ago, while driving on the highway, I got a 'Transmission Fault' message on the dash, and the car immediately went into limp mode. It felt like it was stuck in a high gear and wouldn't shift properly. I pulled over, turned it off and on, and the fault cleared temporarily, but it came back.

I scanned it with my OBD-II reader and got a generic P0700 code, which points to a transmission control system malfunction. I'm really worried this could be a major transmission failure. Has anyone experienced this with their Discovery Sport? What are the common causes for a P0700 and limp mode in these vehicles? Could it be something simpler than a full transmission replacement?

Any guidance would be helpful!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:41 AM

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ClearTheCode admin answer:

A P0700 code in your 2017 Land Rover Discovery Sport HSE Lux indicates that the Transmission Control Module (TCM) has detected a fault and has illuminated the Check Engine Light. This is a generic code that essentially says, "There's a transmission problem, check the TCM for more specific codes." The limp mode you're experiencing is a protective measure by the TCM to prevent further damage.

  1. Understanding P0700:

    • P0700 itself doesn't tell you the specific transmission issue; it's a request from the TCM to the Engine Control Module (ECM) to turn on the Check Engine Light.
    • To get a clearer picture, you need a more advanced scanner capable of reading Land Rover specific transmission codes (P07xx series, P17xx series, etc.) from the TCM itself. These codes will pinpoint the exact nature of the fault.

  2. Common Causes for Transmission Faults & Limp Mode in Discovery Sport:

    • Low or Contaminated Transmission Fluid: Incorrect fluid level or degraded fluid quality can cause shifting problems and overheating, triggering faults.
    • Transmission Solenoid Issues: Solenoids control fluid flow within the transmission for shifting. A faulty solenoid can cause harsh shifts, delayed engagement, or prevent certain gears from engaging.
    • Transmission Control Module (TCM) Failure: The TCM itself can fail, leading to incorrect commands or misinterpretation of sensor data.
    • Speed Sensor Malfunction: Input or output speed sensors within the transmission provide crucial data for shifting. If they fail, the TCM can't accurately determine gear ratios or vehicle speed.
    • Wiring or Connector Issues: Damaged wiring or corroded connectors to the TCM or within the transmission can disrupt communication and cause faults.
    • Valve Body Issues: The valve body is a complex component that directs transmission fluid. Issues here can lead to various shifting problems.

  3. What to Do:

    • Advanced Scan: The absolute first step is to get a diagnostic scan using a tool that can communicate with the Land Rover TCM and read manufacturer-specific codes. This will provide the critical information needed for accurate diagnosis.
    • Check Transmission Fluid: If safe and accessible, check your transmission fluid level and condition (color, smell). Note: Many modern transmissions are sealed and require specific procedures to check fluid levels.
    • Do NOT Drive Extensively: Driving in limp mode or with a known transmission fault can cause severe, irreversible damage to the transmission.

  4. When to See a Shop:

    • Immediately: Given the limp mode and transmission fault, it is highly recommended to have your vehicle towed to a qualified Land Rover specialist or dealership.
    • Specialized Diagnosis: Transmission issues are complex. They require specialized diagnostic tools, knowledge, and potentially dedicated transmission repair equipment. A professional can accurately interpret the specific fault codes, perform necessary tests (e.g., pressure tests, solenoid resistance checks), and determine whether it's a minor component replacement or a more significant transmission repair/replacement.
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