P1718 Code: Meaning, Symptoms, Causes & Fix

P1718

Overview

Code P1718 indicates a fault in TFT Sensor In Range Failure High, typically within powertrain controls.

Symptoms

  • check engine light
  • rough operation in certain conditions
  • reduced performance

Common causes

  • Sensor output out of expected upper range affecting tft sensor in range failure high
  • Reference/ground fault
  • Connector pin damage/corrosion or harness stress near related components

How to diagnose P1718

  1. Confirm P1718 and capture freeze-frame data with a professional scan tool.
  2. Inspect wiring, connectors, and grounds related to tft sensor in range failure high for obvious defects.
  3. Compare live data against expected upper threshold and verify reference voltage.
  4. Check for related DTCs to identify the root-cause chain before replacing parts.
  5. After repair, clear codes and confirm readiness monitors complete without recurrence.

Severity of code P1718

Moderate: This code is moderate severity: the vehicle may still operate, but fault progression can increase repair cost over time.

Can you drive with P1718?

Most vehicles can be driven short-term with P1718, but postpone heavy load/highway driving until repaired.

If the warning lamp is flashing or drivability/safety is affected, avoid driving and diagnose immediately.

How to fix it (step-by-step)

  1. Repair obvious wiring/connector faults first to prevent repeat parts replacement.
  2. Address the root fault mode (high) in the tft sensor in range failure high circuit/system.
  3. Apply the required relearn/adaptation procedure if specified by service information.
  4. Road-test and verify P1718 remains cleared under the conditions that originally set the code.

Fix options

  • Verify reference voltage and inspect wiring.
  • Replace failed sensor if signal remains high.
  • Clear DTCs and verify with live data and completed drive cycle.

Typical repair cost

$200-$900

Common mistakes when diagnosing P1718

  • Replacing parts without verifying voltage, ground, and signal integrity first.
  • Ignoring related stored/pending codes that indicate upstream faults.
  • Skipping post-repair verification drive cycle and readiness checks.

P1718 in common vehicles

P1718 appears across makes such as BMW, Mercedes-Benz, Audi, Volvo. Failure patterns differ by platform: wiring routes, software calibration, and component supplier revisions can change root cause.

Frequently asked questions

What causes P1718?

P1718 is commonly set by high faults affecting tft sensor in range failure high.

How much does it cost to fix P1718?

For P1718, repair costs are typically $200-$900 depending on exact root cause, labor rates, and part quality.

Can I clear P1718 without repair?

You can clear P1718 temporarily, but the code usually returns until the underlying fault is corrected.

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