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2020 Q5 Transmission Hesitation and P0700 Code

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Mike T. · rep 0 · May 22, 4:23 AM · 1 replies · solved · Question

Vehicle: 2020 Audi Q5 45 TFSI S Line

Hello Audi community,

I'm experiencing some concerning issues with my 2020 Audi Q5 45 TFSI S Line. Lately, I've noticed a hesitation during acceleration, particularly from a stop or at low speeds. It feels like the transmission is struggling to engage or shifting roughly.

I hooked up my scanner and pulled a P0700 code, which is a generic 'Transmission Control System Malfunction'. This code usually indicates that the Transmission Control Module (TCM) has detected a fault and stored a more specific code within its own memory.

Has anyone had similar transmission issues with their Q5 of this generation? What was the underlying cause? I'm hoping it's not a major transmission overhaul. Any insights or advice on what to look for before I take it to the dealership would be greatly appreciated. Thanks!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:23 AM

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ClearTheCode admin answer:

The P0700 code on your 2020 Audi Q5 is a general indicator that your Transmission Control Module (TCM) has detected a fault. This code itself doesn't specify the problem but rather points to the fact that a more specific diagnostic trouble code (DTC) is stored within the TCM's memory. The hesitation and rough shifting you're experiencing are direct symptoms of a transmission issue.

Common Causes for P0700 and Transmission Hesitation:

  1. Low or Contaminated Transmission Fluid: Incorrect fluid levels or old, dirty fluid can severely impact transmission performance. Audi transmissions are sensitive to fluid quality and level.
  2. Faulty Transmission Solenoids: Solenoids control the flow of transmission fluid to engage gears. If one or more are sticking or failing, it can cause rough shifts, hesitation, or even prevent gear engagement.
  3. Transmission Speed Sensors: These sensors monitor input and output shaft speeds. Incorrect readings can confuse the TCM, leading to improper shift timing.
  4. Valve Body Issues: The valve body is the 'brain' of the automatic transmission, directing fluid pressure to various clutches and bands. Malfunctions here can cause a wide range of shifting problems.
  5. TCM Malfunction: While less common, the TCM itself can fail, leading to communication issues or incorrect control signals.
  6. Internal Transmission Wear: In some cases, internal components like clutches or bands can wear out, leading to slippage and hesitation.

When to See a Shop:

Given that P0700 is a gateway code, a professional diagnosis using an advanced scanner (like VCDS or ODIS, specific to Audi) is essential. This will allow the technician to access the specific fault codes stored in the TCM, which will pinpoint the exact nature of the problem. Driving with a transmission issue can lead to further damage.

Steps for Diagnosis:

  1. Check Transmission Fluid: While many modern Audi transmissions are considered 'sealed for life,' it's crucial to have the fluid level and condition checked by a professional. This often requires specific procedures and tools.
  2. Advanced Scan Tool: A shop will use a specialized scan tool to read the specific fault codes from the TCM. These codes will provide much more detail than the generic P0700.
  3. Live Data Monitoring: Technicians can monitor transmission sensor readings, solenoid operation, and shift patterns in real-time to identify anomalies.
  4. Test Drive: A controlled test drive can help replicate the symptoms and confirm the diagnostic findings.
  5. Visual Inspection: Look for any external leaks around the transmission or damaged wiring harnesses leading to the TCM or transmission sensors.
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